{"id":582,"date":"2025-12-29T07:21:36","date_gmt":"2025-12-29T06:21:36","guid":{"rendered":"https:\/\/piotrowskipawel.pl\/ogniskowa-obiektywu-jak-wybrac-i-wykorzystac-w-fotografii\/"},"modified":"2025-12-29T07:21:36","modified_gmt":"2025-12-29T06:21:36","slug":"ogniskowa-obiektywu-jak-wybrac-i-wykorzystac-w-fotografii","status":"publish","type":"post","link":"https:\/\/piotrowskipawel.pl\/en\/lens-focal-length-how-to-choose-and-use-in-photography\/","title":{"rendered":"Lens focal length: how to choose and use in photography"},"content":{"rendered":"<p><strong>Focal length<\/strong> is one of the most important lens parameters in photography. It determines how far the focus point of light is from the camera sensor, measuring this distance usually in millimetres. <strong>It determines the width of the frame, the degree of background compression and the extent to which the image will be distorted.<\/strong><\/p>\n<p>Choosing the right focal length is crucial to the final result of the photo. <strong>Short focal lengths<\/strong> are perfect for photographing expansive landscapes or interiors when you want to cover a wide scene in a single shot. <strong>Longer focal lengths<\/strong> allow you to focus your gaze on further elements and capture more detail from afar.<\/p>\n<ul>\n<li>Short focal lengths enable wide scenes to be photographed,<\/li>\n<li>Longer focal lengths allow you to zoom in on distant objects and bring out details,<\/li>\n<li>different focal lengths affect the perception of space and the compression of the background.<\/li>\n<\/ul>\n<p><strong>The different focal lengths also offer different opportunities to create perspective and influence how we perceive the space depicted in the photograph.<\/strong> Conscious use of this parameter allows you to have better control of your equipment and achieve the desired results whether you are shooting portraits, landscapes or other types of photography.<\/p>\n<div id=\"ez-toc-container\" class=\"ez-toc-v2_0_88 counter-hierarchy ez-toc-counter ez-toc-grey ez-toc-container-direction\">\n<div class=\"ez-toc-title-container\">\n<p class=\"ez-toc-title\" style=\"cursor:inherit\">Table of contents<\/p>\n<span class=\"ez-toc-title-toggle\"><a href=\"#\" class=\"ez-toc-pull-right ez-toc-btn ez-toc-btn-xs ez-toc-btn-default ez-toc-toggle\" aria-label=\"Toggle Table of Content\"><span class=\"ez-toc-js-icon-con\"><span class=\"\"><span class=\"eztoc-hide\" style=\"display:none;\">Toggle<\/span><span class=\"ez-toc-icon-toggle-span\"><svg style=\"fill: #999;color:#999\" xmlns=\"http:\/\/www.w3.org\/2000\/svg\" class=\"list-377408\" width=\"20px\" height=\"20px\" viewbox=\"0 0 24 24\" fill=\"none\"><path d=\"M6 6H4v2h2V6zm14 0H8v2h12V6zM4 11h2v2H4v-2zm16 0H8v2h12v-2zM4 16h2v2H4v-2zm16 0H8v2h12v-2z\" fill=\"currentColor\"><\/path><\/svg><svg style=\"fill: #999;color:#999\" class=\"arrow-unsorted-368013\" xmlns=\"http:\/\/www.w3.org\/2000\/svg\" width=\"10px\" height=\"10px\" viewbox=\"0 0 24 24\" version=\"1.2\" baseprofile=\"tiny\"><path d=\"M18.2 9.3l-6.2-6.3-6.2 6.3c-.2.2-.3.4-.3.7s.1.5.3.7c.2.2.4.3.7.3h11c.3 0 .5-.1.7-.3.2-.2.3-.5.3-.7s-.1-.5-.3-.7zM5.8 14.7l6.2 6.3 6.2-6.3c.2-.2.3-.5.3-.7s-.1-.5-.3-.7c-.2-.2-.4-.3-.7-.3h-11c-.3 0-.5.1-.7.3-.2.2-.3.5-.3.7s.1.5.3.7z\"\/><\/svg><\/span><\/span><\/span><\/a><\/span><\/div>\n<nav><ul class='ez-toc-list ez-toc-list-level-1' ><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-1\" href=\"https:\/\/piotrowskipawel.pl\/en\/lens-focal-length-how-to-choose-and-use-in-photography\/#Co_to_jest_ogniskowa_obiektywu_i_jak_sie_ja_mierzy\" >What is the focal length of a lens and how is it measured?<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-2\" href=\"https:\/\/piotrowskipawel.pl\/en\/lens-focal-length-how-to-choose-and-use-in-photography\/#Ogniskowa_obiektywu_a_kat_widzenia_%E2%80%93_zaleznosci_i_praktyczne_znaczenie\" >Lens focal length and angle of view - correlations and practical importance<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-3\" href=\"https:\/\/piotrowskipawel.pl\/en\/lens-focal-length-how-to-choose-and-use-in-photography\/#Ogniskowa_a_rozmiar_matrycy_%E2%80%93_pelna_klatka_APS-C_crop_i_mnoznik_ogniskowej\" >Focal length vs. sensor size - full frame, APS-C, crop and focal length multiplier<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-4\" href=\"https:\/\/piotrowskipawel.pl\/en\/lens-focal-length-how-to-choose-and-use-in-photography\/#Zakresy_ogniskowych_%E2%80%93_od_szerokiego_kata_do_teleogniskowej\" >Focal length ranges from wide angle to tele-focal length<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-5\" href=\"https:\/\/piotrowskipawel.pl\/en\/lens-focal-length-how-to-choose-and-use-in-photography\/#Rodzaje_obiektywow_wedlug_ogniskowej_%E2%80%93_staloogniskowe_zmiennoogniskowe_ultraszerokokatne_teleobiektywy_fisheye\" >Types of lenses by focal length - fixed focal length, zoom, ultra wide angle, telephoto, fisheye<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-6\" href=\"https:\/\/piotrowskipawel.pl\/en\/lens-focal-length-how-to-choose-and-use-in-photography\/#Wplyw_ogniskowej_na_perspektywe_kompresje_tla_i_wyglad_zdjec\" >Influence of focal length on perspective, background compression and image appearance<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-7\" href=\"https:\/\/piotrowskipawel.pl\/en\/lens-focal-length-how-to-choose-and-use-in-photography\/#Ogniskowa_a_glebia_ostrosci_ostrosc_i_efekt_bokeh\" >Focal length vs. depth of field, sharpness and bokeh effect<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-8\" href=\"https:\/\/piotrowskipawel.pl\/en\/lens-focal-length-how-to-choose-and-use-in-photography\/#Znieksztalcenia_optyczne_%E2%80%93_dystorsja_aberracje_i_wplyw_ogniskowej\" >Optical distortion - distortion, aberration and focal length effect<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-9\" href=\"https:\/\/piotrowskipawel.pl\/en\/lens-focal-length-how-to-choose-and-use-in-photography\/#Jak_wybrac_odpowiednia_ogniskowa_do_roznych_rodzajow_fotografii\" >How do you choose the right focal length for different types of photography?<\/a><\/li><\/ul><\/nav><\/div>\n<h2><span class=\"ez-toc-section\" id=\"Co_to_jest_ogniskowa_obiektywu_i_jak_sie_ja_mierzy\"><\/span>What is the focal length of a lens and how is it measured?<span class=\"ez-toc-section-end\"><\/span><\/h2>\n<p><strong>Lens focal length<\/strong>, expressed in millimetres, is the distance between the centre of the optical system and the camera sensor. <strong>This parameter determines both how wide a section of the scene will be captured and how close distant elements will be zoomed in.<\/strong> Wide angle lenses - for example those with a focal length of <strong>18 mm<\/strong> - cover a wide frame, while models with long focal lengths (such as the <strong>200 mm<\/strong>) allow you to focus on a narrower section of the image and achieve a strong magnification.<\/p>\n<p>The focal length is measured when the focus is set to infinity. In this situation, the distance between the main optical plane of the lens and the camera sensor is determined. <strong>Manufacturers always include focal length information directly on the lens body.<\/strong> The very definition of this parameter is simple: it is the length of the light path focused by the optical system to the light-sensitive surface of the camera when focusing at infinity.<\/p>\n<p><strong>It is worth emphasising that the position of the subject does not affect the focal length value - this is a result of the design and characteristics of the lenses used.<\/strong> However, depending on the size of the sensor, a so-called crop converter is used.<\/p>\n<ul>\n<li>For APS-C cameras it is typically 1.5x,<\/li>\n<li>in the Micro 4\/3 system as much as 2x.<\/li>\n<\/ul>\n<p>It is the focal length that defines the field of view of a given lens. <strong>Short focal lengths enable wide shots to be captured and are great for landscape or architectural photography.<\/strong> Longer ones allow details to be seen from long distances and are therefore often chosen by sports photographers or nature-watching enthusiasts.<\/p>\n<h2><span class=\"ez-toc-section\" id=\"Ogniskowa_obiektywu_a_kat_widzenia_%E2%80%93_zaleznosci_i_praktyczne_znaczenie\"><\/span>Lens focal length and angle of view - correlations and practical importance<span class=\"ez-toc-section-end\"><\/span><\/h2>\n<p><strong>Lens focal length<\/strong> has a direct impact on how wide a portion of the scene the camera captures.<\/p>\n<ul>\n<li>shorter focal lengths, such as <strong>18 mm<\/strong>, they allow you to capture an extensive image,<\/li>\n<li>In a photograph with a short focal length, you can see much more detail of the surroundings,<\/li>\n<li>longer focal lengths, for example <strong>200 mm<\/strong>, they narrow the frame and make it easier to focus on specific, distant elements.<\/li>\n<\/ul>\n<p><strong>Viewing angle<\/strong> always refers to the camera's full-frame sensor.<\/p>\n<ul>\n<li>the same lens mounted on a body with a smaller sensor, e.g. <strong>APS-C<\/strong> with a crop multiplier <strong>1,5x<\/strong>, captures a narrower range of the scene,<\/li>\n<li>lens with focal length <strong>50 mm<\/strong> on an APS-C sensor gives a field of view equivalent to approximately <strong>75 mm<\/strong> on a full-frame camera,<\/li>\n<li>crop effect must be taken into account in order to achieve a predictable result for the photo.<\/li>\n<\/ul>\n<p>The relationship between focal length and angle of view proves to be important when selecting equipment for specific photographic applications.<\/p>\n<ul>\n<li>wide angles work well with <strong>landscape photography<\/strong> i <strong>interior photography<\/strong>, enabling a large area to be covered in a single shot,<\/li>\n<li>The narrow field of view allows the main subject to be distinguished and distant details to be captured,<\/li>\n<li>this solution is often chosen by lovers of <strong>sport<\/strong> and <strong>wildlife watchers<\/strong>.<\/li>\n<\/ul>\n<p><strong>The size of the sensor significantly affects the final appearance of the photo.<\/strong> Users of cameras with part-frame sensors should bear in mind the need to take into account the crop factor and convert the actual angle of view of their lenses accordingly. This approach avoids unforeseen effects and achieves the intended visual result.<\/p>\n<p><strong>Skilful handling of the relationship between focal length and angle of view helps to create interesting compositions and build the desired perspective of the frame.<\/strong> This makes it easier to select equipment to suit your needs and the specifics of a particular photo shoot.<\/p>\n<h2><span class=\"ez-toc-section\" id=\"Ogniskowa_a_rozmiar_matrycy_%E2%80%93_pelna_klatka_APS-C_crop_i_mnoznik_ogniskowej\"><\/span>Focal length vs. sensor size - full frame, APS-C, crop and focal length multiplier<span class=\"ez-toc-section-end\"><\/span><\/h2>\n<p><strong>The size of the sensor clearly affects how the focal length of the lens translates into the range visible in the frame.<\/strong> On full-frame cameras, the sensor size is <strong>36\u00d724 mm<\/strong> - It is to these dimensions that the standard viewing angles attributed to specific focal lengths refer. In the case of smaller APS-C sensors (usually approx. <strong>23.6\u00d715.6 mm<\/strong>), the camera captures only the central part of the image projected through the lens.<\/p>\n<p>Concept <strong>croppa<\/strong>, or crop factor, determines the relationship of the size of the APS-C sensor to the full frame. The most common values are <strong>1,5x<\/strong> or <strong>1,6x<\/strong>. This translates into a narrower angle of view using the same optics - images taken with an APS-C mounted lens cover a smaller portion of the scene than those taken with a full-frame camera. <strong>To check the actual effect of such a set-up, simply multiply the real focal length by the crop value.<\/strong> For example, a \"fifty\" connected to a body with a multiplier of 1.5x gives a field of view typical of a lens <strong>75 mm<\/strong> used on a full frame.<\/p>\n<ul>\n<li>With a full-frame sensor (36\u00d724 mm), you get an image compatible with standard focal lengths,<\/li>\n<li>With an APS-C sensor (approx. 23.6\u00d715.6 mm), the camera captures only the central part of the image,<\/li>\n<li>The crop factor (e.g. 1.5x or 1.6x) determines how much the field of view is narrowed,<\/li>\n<li>an image taken with the same lens on APS-C covers a smaller area of the scene,<\/li>\n<li>recalculating the focal length makes it possible to predict the end result of a photograph.<\/li>\n<\/ul>\n<p>Such qualities are important when selecting equipment and planning the composition of a shot. By photographing a landscape with the same glass on a DSLR with an APS-C sensor instead of a full-frame sensor, you will get <strong>tighter section of the scene and stronger enlargement of central details<\/strong>. <strong>For telephoto lenses, such an effect even works to their advantage - it allows you to capture distant motifs more closely without having to reach for longer focal lengths.<\/strong><\/p>\n<p>Being aware of the focal length multiplier enables you to better match the parameters of your optics to your specific application - whether it is portraits, sports photography or other genres of photography that require a considered perspective. <strong>For the Micro 4\/3 system this ratio is as much as 2x<\/strong>; this means an even greater narrowing of the field of view for the same lens length.<\/p>\n<p><strong>both sensor size and crop value have a decisive impact on the actual image captured by the camera<\/strong> - regardless of what the name or manufacturer's description of a particular glass suggests. By keeping these differences in mind, it is easier to avoid unexpected effects when using cameras other than full-frame models.<\/p>\n<h2><span class=\"ez-toc-section\" id=\"Zakresy_ogniskowych_%E2%80%93_od_szerokiego_kata_do_teleogniskowej\"><\/span>Focal length ranges from wide angle to tele-focal length<span class=\"ez-toc-section-end\"><\/span><\/h2>\n<p>The focal range includes both very short and extremely long values. <strong>A wide angle of view is guaranteed by lenses with a small focal length<\/strong>, while those with higher parameters, referred to as telefocal, allow for close-ups of distant objects.<\/p>\n<ul>\n<li>The wide-angle category usually includes models starting from <strong>10 mm<\/strong> up to about <strong>35 mm<\/strong>,<\/li>\n<li>With them, wide panoramas or vast interiors can be captured,<\/li>\n<li>are a popular choice for landscape photography and when capturing architecture,<\/li>\n<li>for example, glass with a focal length of <strong>24 mm<\/strong> allows a large part of the scene to be covered in a single shot,<\/li>\n<li>Wide-angle lenses work well where it is important to show a lot of the surroundings around the main subject.<\/li>\n<\/ul>\n<p><strong>A focal length of around 50 mm is considered to be standard<\/strong> and produces an image most similar to what the human eye sees. Such lenses are mainly used for portraits of people and in everyday photographic situations.<\/p>\n<ul>\n<li>telefocusing begins where standard ranges end - above the <strong>85 mm<\/strong>,<\/li>\n<li>The greater the number of millimetres, the more restricted the angle of the covered scene and the stronger the magnification of distant elements in the frame,<\/li>\n<li>long lenses of the type <strong>200 mm<\/strong> great for sports or wildlife photography,<\/li>\n<li>enable details to be recorded without having to get closer,<\/li>\n<li>telefocusing allows you to focus your attention on a specific element of the scene and separate it from the background.<\/li>\n<\/ul>\n<p><strong>Choosing the right focal length has a direct impact on how you compose your photo and how you portray your chosen subject.<\/strong> The wide angle is indispensable where it is important to show a lot of the surroundings, while the telefocal angle allows you to selectively present the protagonist of a photograph or bring out details from a distance.<\/p>\n<ul>\n<li>the individual focal length ranges affect the character of the final photograph,<\/li>\n<li>determine the dynamics of the perspective, the degree of plan compression or the strength of the background blur,<\/li>\n<li>shots taken from a wide angle strongly emphasise the space and depth of the image,<\/li>\n<li>The telephoto lens helps to direct the viewer's gaze to a selected part of the frame and almost completely exclude the surrounding context,<\/li>\n<li><strong>by choosing the right focal range you have a real influence on the final result of your photographic work<\/strong>.<\/li>\n<\/ul>\n<h2><span class=\"ez-toc-section\" id=\"Rodzaje_obiektywow_wedlug_ogniskowej_%E2%80%93_staloogniskowe_zmiennoogniskowe_ultraszerokokatne_teleobiektywy_fisheye\"><\/span>Types of lenses by focal length - fixed focal length, zoom, ultra wide angle, telephoto, fisheye<span class=\"ez-toc-section-end\"><\/span><\/h2>\n<p>Fixed focal length lenses are distinguished by <strong>one fixed focal length<\/strong> - 35 mm or 85 mm, for example. With this design, they provide <strong>outstanding image quality<\/strong> and <strong>high brightness<\/strong>. Photographers particularly value them for portraits and reportage, appreciating the <strong>accuracy of reproduction<\/strong>. Variable-focus models allow <strong>infinitely adjustable focal length<\/strong> in a wide range, for example from 24 to 70 mm. This solution provides <strong>a high degree of flexibility to work in the field<\/strong>, which is extremely useful for travel and reportage photography.<\/p>\n<ul>\n<li>Fixed focal length lenses offer outstanding sharpness and brightness,<\/li>\n<li>zooms allow you to quickly adapt the frame to the current situation,<\/li>\n<li>The ultra-wide-angle lens allows extremely wide scenes to be captured,<\/li>\n<li>telephoto lenses allow distant subjects to be photographed at high magnification,<\/li>\n<li>fisheye introduce creative possibilities with their characteristic image distortion.<\/li>\n<\/ul>\n<p>Ultra wide angle lenses stand out <strong>very short focal lengths, usually between 10-18 mm<\/strong>. They allow you to capture <strong>extensive scenes<\/strong> thanks to a field of vision of up to 100 degrees. <strong>Great for landscapes, interiors and architecture<\/strong>. Telephoto lenses have <strong>longer focal lengths - from around 85 mm to even over 200 mm<\/strong>, enabling <strong>photographing distant objects with high magnification<\/strong>. They are therefore an essential tool in <strong>sports and nature photography<\/strong>.<\/p>\n<p><strong>Fisheye<\/strong> is a unique variation of the ultra-wide-angle lens with an extremely short focal length, typically between 8 and 16 mm. It provides <strong>extraordinarily wide viewing angle - up to 180 degrees<\/strong>but the image is heavily distorted by the <strong>barrel distortion<\/strong>. <strong>This effect gives the photographs a unique, creative atmosphere<\/strong> and is readily used in custom framing and panoramas.<\/p>\n<p><strong>Choosing the right lens depends on the needs of the photographer and the intended effect<\/strong>. Fixed-focal models guarantee <strong>excellent sharpness<\/strong>, zooms allow <strong>quickly adjust the frame<\/strong>ultra-wide lenses work well with <strong>wide shots<\/strong>, telephoto lenses enable <strong>observation from a distance<\/strong>and fisheye give <strong>the chance to experiment with the prospect of<\/strong>. <strong>Each type of lens has its place in different areas of photography, influencing the way viewers perceive the image<\/strong>.<\/p>\n<h2><span class=\"ez-toc-section\" id=\"Wplyw_ogniskowej_na_perspektywe_kompresje_tla_i_wyglad_zdjec\"><\/span>Influence of focal length on perspective, background compression and image appearance<span class=\"ez-toc-section-end\"><\/span><\/h2>\n<p><strong>Lens focal length<\/strong> significantly influences how the pictures look.<\/p>\n<p>It shapes the perspective, is responsible for how the background is perceived and the viewer's overall perception of the scene.<\/p>\n<ul>\n<li>when using short focal lengths, such as <strong>18 mm<\/strong> or <strong>24 mm<\/strong>, the picture takes on a vastness,<\/li>\n<li>the close elements appear highly exposed compared to those further away,<\/li>\n<li>This adds depth and energy to photographs.<\/li>\n<\/ul>\n<p><strong>The wide angle captures the vastness of space, which will be particularly appreciated by lovers of architecture and landscape photography.<\/strong><\/p>\n<p>In contrast, longer focal lengths - for example <strong>85 mm<\/strong> or <strong>200 mm<\/strong> - work very differently.<\/p>\n<ul>\n<li>cause a space compression effect,<\/li>\n<li>distant objects appear closer together than they actually are,<\/li>\n<li>The flattening of perspective is ideal for portrait or sports photography,<\/li>\n<li>it is easier to focus the viewer's gaze on the main character in the frame,<\/li>\n<li>create a more intimate atmosphere for the photograph.<\/li>\n<\/ul>\n<p><strong>Long focal lengths help to isolate the subject and reduce distracting details in the background.<\/strong><\/p>\n<p>It is also worth noting that as the focal length increases, the range of focus covering the scene in front of and behind the focus point decreases.<\/p>\n<ul>\n<li>long lenses enable effective background blur (<strong>bokeh<\/strong>),<\/li>\n<li>are often used for portraits or macro photography,<\/li>\n<li>allow you to better distinguish details or a person from the environment,<\/li>\n<li>The wide-angle glass ensures almost uniform sharpness throughout the frame.<\/li>\n<\/ul>\n<p><strong>By choosing the right focal length, you decide how the viewer will interpret the photograph.<\/strong> The wide angle accentuates spatial relationships and adds dynamism to the composition, while the telephoto lens allows you to isolate a selected part of the scene and reduce distracting details in the background. Conscious handling of the different focal lengths gives you full control over the character of the image and allows you to realise your own creative vision.<\/p>\n<h2><span class=\"ez-toc-section\" id=\"Ogniskowa_a_glebia_ostrosci_ostrosc_i_efekt_bokeh\"><\/span>Focal length vs. depth of field, sharpness and bokeh effect<span class=\"ez-toc-section-end\"><\/span><\/h2>\n<p><strong>Lens focal length<\/strong> plays a huge role in shaping the depth of field, the sharpness of the photograph and in achieving the bokeh effect. When choosing lenses with <strong>greater focal length<\/strong>For example, at 85 mm or 200 mm, you will notice a significant reduction in the focus range - only a small area of the frame remains in focus. <strong>This treatment effectively isolates the subject from the background and achieves an effective blur outside the focus zone.<\/strong><\/p>\n<p>Fixed focal length lenses are often distinguished by <strong>high brightness<\/strong>, for example f\/1.4 or f\/1.8. This allows the photographer to work with a very shallow depth of field, achieving expressive and artistic bokeh. <strong>The background then lays down softly and the points of light blend smoothly into each other - this type of blur is particularly appreciated for portraits or macro shots.<\/strong><\/p>\n<p>In turn <strong>shorter focal lengths<\/strong>such as the popular 24 mm, even at open aperture they provide a large area of sharp detail. As a result, it is more difficult here to achieve a strongly blurred background or to strongly separate the subject of the photo from the rest of the scene.<\/p>\n<ul>\n<li>Changing the focal length affects the precision of the focus point when taking pictures,<\/li>\n<li>The longer the lens and the wider the aperture, the greater the need for accuracy,<\/li>\n<li>A minor error easily leads to a loss of image clarity,<\/li>\n<li>When using high-brightness telephoto lenses, special care must be taken when focusing,<\/li>\n<li>The size of the camera's sensor also affects the degree of background blur, together with the focal length and aperture value selected.<\/li>\n<\/ul>\n<p>For example, a portrait taken with 85mm f\/1.8 glass on a full frame will produce a <strong>intense bokeh<\/strong> and selectively highlight the model's face.<\/p>\n<p><strong>The longer the focal length used, the shallower the depth of field will become and the softer the background in the photograph.<\/strong> Fixed focal length optics models make it much easier to create aesthetic blur with their wide apertures. <strong>The skilful juxtaposition of these parameters translates directly into the quality of the images and enables precise control of what is to remain the focus of the frame.<\/strong><\/p>\n<h2><span class=\"ez-toc-section\" id=\"Znieksztalcenia_optyczne_%E2%80%93_dystorsja_aberracje_i_wplyw_ogniskowej\"><\/span>Optical distortion - distortion, aberration and focal length effect<span class=\"ez-toc-section-end\"><\/span><\/h2>\n<p><strong>Optical distortion is closely linked to the focal length of the lens used.<\/strong> Short focal lengths, such as <strong>10 mm<\/strong> or <strong>18 mm<\/strong>often lead to barrel distortion - in which case the lines at the edges of the frame bend outwards. <strong>This effect is particularly noticeable when photographing interiors or buildings and can significantly affect the perception of the image.<\/strong><\/p>\n<p>At longer focal lengths, for example <strong>135 mm<\/strong> or <strong>200 mm<\/strong>Pillow distortion occurs - straight edges curve towards the centre of the image. Although at first glance it is not so troublesome in everyday situations, it becomes noticeable when photographing subjects with clear geometric shapes.<\/p>\n<ul>\n<li>other optical imperfections also appear,<\/li>\n<li>among them chromatic and spherical aberrations,<\/li>\n<li>Chromatic aberration manifests itself as coloured glows around contrasting lines,<\/li>\n<li>most often affects wide-angle or cheaper lenses,<\/li>\n<li>Spherical aberration causes loss of focus through lens irregularities.<\/li>\n<\/ul>\n<p><strong>Any kind of deformation and aberration affects the final quality of the photo regardless of the camera sensor used.<\/strong> Fortunately, modern image editing tools make it possible to effectively correct these deficiencies at the post-production stage. Ready-made profiles for many types of lenses make geometry correction fast and without major loss of image quality.<\/p>\n<p>When choosing a focal length, it is worth considering not only the desired visual effect, but also the potential distortion of the image. <strong>Architectural photographers often go for lenses that minimise the barrel effect, while portrait photographers prefer longer focal lengths that keep facial features natural.<\/strong><\/p>\n<ul>\n<li>Ultra-wide-angle lenses and \"fisheye\" lenses generate the characteristic barrel distortion,<\/li>\n<li>This effect is sometimes used intentionally or accepted for the original character of the panoramas,<\/li>\n<li>Pillow distortion is prevalent in telephoto lenses used in sports and nature photography.<\/li>\n<\/ul>\n<p>Advanced optical designs, especially premium models, reduce the visibility of defects more effectively and produce better images without additional digital retouching. <strong>However, even top-of-the-range equipment does not guarantee a complete absence of aberrations - it is worth knowing how to correct them when working on your images.<\/strong><\/p>\n<p><strong>The focal length of the lens determines both the type and the strength of optical distortion - and the right graphic editing can produce excellent results regardless of the camera.<\/strong><\/p>\n<h2><span class=\"ez-toc-section\" id=\"Jak_wybrac_odpowiednia_ogniskowa_do_roznych_rodzajow_fotografii\"><\/span>How do you choose the right focal length for different types of photography?<span class=\"ez-toc-section-end\"><\/span><\/h2>\n<p><strong>Focal length selection<\/strong> is strongly dependent on what we intend to photograph and the effect we want to achieve.<\/p>\n<ul>\n<li>in landscape photography, the best <strong>wide angle lenses 16-24 mm<\/strong> (full frame),<\/li>\n<li>in portraits, the optimum range is <strong>85 mm or 50-135 mm<\/strong>for natural facial expressions and effective background blur (<strong>bokeh<\/strong>),<\/li>\n<li>in sports and nature photography, it is essential <strong>long focal lengths above 200 mm<\/strong>, allowing action or animals to be captured from a distance,<\/li>\n<li>In street photography, the following are ideal <strong>35-50 mm lenses<\/strong>, giving a realistic image close to natural human vision,<\/li>\n<li>The choice of focal length is also influenced by <strong>sensor size and crop factor<\/strong> - For example, a 50 mm lens on an APS-C camera with a multiplier of x1.5 gives a field of view like a classic 75.<\/li>\n<\/ul>\n<p><strong>The right choice of focal length determines how wide a field the image will cover and how the subject will be portrayed.<\/strong> A wide-angle lens allows you to emphasise the space and vastness of a scene, while a telephoto lens focuses attention on a specific detail and allows you to elegantly 'flatten' the image, eliminating perspective distortion. <strong>Each type of photography - landscape, portrait or sports - requires a different focal range to get the most out of your equipment and get the best results.<\/strong><\/p>","protected":false},"excerpt":{"rendered":"<p>Focal length is one of the most important lens parameters in photography. 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