{"id":102,"date":"2009-07-10T08:45:49","date_gmt":"2009-07-10T13:45:49","guid":{"rendered":"http:\/\/cesardphoto.com\/blog\/?p=102"},"modified":"2009-07-10T09:28:34","modified_gmt":"2009-07-10T14:28:34","slug":"if-we-hunt-for-light-we-need-to-talk-about-f-stop","status":"publish","type":"post","link":"https:\/\/cesardphoto.com\/blog\/2009\/07\/if-we-hunt-for-light-we-need-to-talk-about-f-stop\/","title":{"rendered":"If we hunt for LIGHT, we need to talk about f-stop&#8230;."},"content":{"rendered":"<p>I was watching this morning the last show from DTownTV.com, hummm, again The Minimun Aperture sounds WRONG for me and I am really want to post this, is a compendium of info available for you here, hope you like it.<\/p>\n<p>The aperture stop is an important element in most optical designs. Its most obvious feature is that it limits the amount of light that can reach the image\/film plane. This can either be undesired, as in a telescope where one wants to collect as much light as possible; or deliberate, to prevent saturation of a detector or overexposure of film. In both cases, the size of the aperture stop is constrained by things other than the amount of light admitted, however:<\/p>\n<ul>\n<li>The size of the stop is one factor that affects depth of field. Smaller stops (larger f numbers) produce a longer depth of field, allowing objects at a wide range of distances to all be in focus at the same time.<\/li>\n<li>The stop limits the effect of optical aberrations. If the stop is too large, the image will be distorted. More sophisticated optical system designs can mitigate the effect of aberrations, allowing a larger stop and therefore greater light collecting ability.<\/li>\n<li>The stop determines whether the image will be vignetted. Larger stops can cause the intensity reaching the film or detector to fall off toward the edges of the picture, especially when for off-axis points a different stop becomes the aperture stop by virtue of cutting off more light than did the stop that was the aperture stop on the optic axis.<\/li>\n<li>A larger aperture stop requires larger diameter optics, which are heavier and more expensive.<\/li>\n<\/ul>\n<p>In addition to an aperture stop, a photographic lens may have one or more <em>field stops<\/em>, which limit the system&#8217;s field of view. When the field of view is limited by a field stop in the lens (rather than at the film or sensor) vignetting results; this is only a problem if the resulting field of view is less than was desired.<\/p>\n<p>The pupil of the eye is its aperture; the iris is the diaphragm that serves as the aperture stop. Refraction in the cornea causes the effective aperture (the entrance pupil) to differ slightly from the physical pupil diameter. The entrance pupil is typically about 4 mm in diameter, although it can range from 2 mm (<span style=\"FONT-STYLE: italic; FONT-FAMILY: Trebuchet MS, Candara, Georgia, Calibri, Corbel, serif\">f<\/span>\/8.3) in a brightly lit place to 8 mm (<span style=\"FONT-STYLE: italic; FONT-FAMILY: Trebuchet MS, Candara, Georgia, Calibri, Corbel, serif\">f<\/span>\/2.1) in the dark.<\/p>\n<p>In astronomy, the diameter of the aperture stop (called the <em>aperture<\/em>) is a critical parameter in the design of a telescope. Generally, one would want the <em>aperture<\/em> to be as large as possible, to collect the maximum amount of light from the distant objects being imaged. The size of the aperture is limited, however, in practice by considerations of cost and weight, as well as prevention of aberrations (as mentioned above).<\/p>\n<p>The aperture stop of a photographic lens can be adjusted to control the amount of light reaching the film or image sensor. In combination with variation of shutter speed, the aperture size will regulate the film&#8217;s degree of exposure to light. Typically, a fast shutter speed will require a larger aperture to ensure sufficient light exposure, and a slow shutter speed will require a smaller aperture to avoid excessive exposure.<\/p>\n<div>\n<div style=\"width: 352px;\"><img decoding=\"async\" src=\"http:\/\/upload.wikimedia.org\/wikipedia\/commons\/thumb\/8\/87\/Aperture_diagram.svg\/350px-Aperture_diagram.svg.png\" alt=\"\" width=\"350\" height=\"139\" \/><\/div>\n<div>\n<div><a title=\"Enlarge\" href=\"\/wiki\/File:Aperture_diagram.svg\"><\/a><\/div>\n<p>Diagram of decreasing aperture sizes (increasing f-numbers) for &#8220;full stop&#8221; increments (factor of two aperture area per stop)<\/p><\/div>\n<\/div>\n<p>A device called a diaphragm usually serves as the aperture stop, and controls the aperture. The diaphragm functions much like the iris of the eye\u2014it controls the effective diameter of the lens opening. Reducing the aperture size increases the depth of field, which describes the extent to which subject matter lying closer than or farther from the actual plane of focus appears to be in focus. In general, the smaller the aperture (the larger the number), the greater the distance from the plane of focus the subject matter may be while still appearing in focus.<\/p>\n<p>The lens aperture is usually specified as an f-number, the ratio of focal length to effective aperture diameter. A lens typically has a set of marked &#8220;f-stops&#8221; that the f-number can be set to. A lower f-number denotes a greater aperture opening which allows more light to reach the film or image sensor. The photography term &#8220;one f-stop&#8221; refers to a factor of v2 (approx. 1.41) change in f-number, which in turn corresponds to a factor of 2 change in light intensity.<\/p>\n<p>Aperture priority is a semi-automatic shooting mode used in cameras. It allows the photographer to choose an aperture setting and allow the camera to decide the shutter speed and sometimes ISO sensitivity for the correct exposure. This is sometimes referred to as Aperture Priority Auto Exposure, A mode, Av mode, or semi-auto mode.<\/p>\n<p><strong><em>Maximum and minimum apertures<\/em><\/strong><\/p>\n<p>The specifications for a given lens typically include the minimum and maximum apertures. These refer to the maximum and minimum f-numbers the lens can be set at to achieve, respectively.<\/p>\n<p>A typical lens will have an f-number range from <span style=\"FONT-STYLE: italic; FONT-FAMILY: Trebuchet MS, Candara, Georgia, Calibri, Corbel, serif\">f<\/span>\/16 (small aperture) to <span style=\"FONT-STYLE: italic; FONT-FAMILY: Trebuchet MS, Candara, Georgia, Calibri, Corbel, serif\">f<\/span>\/2 (large aperture) (these values vary). The maximum aperture (minimum f-number) tends to be of most interest (and is always included when describing a lens). This value is also known as the <strong>lens speed<\/strong>, because it is proportional to the square of accepted light, and thus inversely proportional to the square of required exposure time (i.e. using a lens with f\/2, one can take pictures at one quarter of the exposure time necessary using a f\/4 lens). Lenses for 35mm cameras can have f-numbers below <span style=\"FONT-STYLE: italic; FONT-FAMILY: Trebuchet MS, Candara, Georgia, Calibri, Corbel, serif\">f<\/span>\/1.0. For instance both the Leica Noctilux-M 50mm ASPH and a Canon 50mm L-mount for rangefinders have a maximum aperture of <span style=\"FONT-STYLE: italic; FONT-FAMILY: Trebuchet MS, Candara, Georgia, Calibri, Corbel, serif\">f<\/span>\/0.95. Professional lenses for some movie cameras have f-numbers as low as <span style=\"FONT-STYLE: italic; FONT-FAMILY: Trebuchet MS, Candara, Georgia, Calibri, Corbel, serif\">f<\/span>\/0.75 (very large relative aperture). These are known as &#8220;fast&#8221; lenses because they allow in more light and therefore reduce the exposure time. Stanley Kubrick&#8217;s film <em>Barry Lyndon<\/em> has scenes with the largest relative aperture in film history: <span style=\"FONT-STYLE: italic; FONT-FAMILY: Trebuchet MS, Candara, Georgia, Calibri, Corbel, serif\">f<\/span>\/0.7.<\/p>\n<p>Lenses of low f-number, often with fixed focal length, are popular for example with photojournalists, who often work in dim light and typically have limited opportunity to introduce supplementary lighting.<\/p>\n<p>Zoom lenses typically have a maximum aperture (minimum f-number) of <span style=\"FONT-STYLE: italic; FONT-FAMILY: Trebuchet MS, Candara, Georgia, Calibri, Corbel, serif\">f<\/span>\/2.8 to <span style=\"FONT-STYLE: italic; FONT-FAMILY: Trebuchet MS, Candara, Georgia, Calibri, Corbel, serif\">f<\/span>\/6.3 through their range. A very fast zoom lens will be constant <span style=\"FONT-STYLE: italic; FONT-FAMILY: Trebuchet MS, Candara, Georgia, Calibri, Corbel, serif\">f<\/span>\/2.8 or <span style=\"FONT-STYLE: italic; FONT-FAMILY: Trebuchet MS, Candara, Georgia, Calibri, Corbel, serif\">f<\/span>\/2, which means the relative aperture will stay the same throughout the zoom range. A more typical consumer zoom will have a variable relative aperture, since it is harder and more expensive to keep the effective aperture proportional to focal length at long focal lengths; <span style=\"FONT-STYLE: italic; FONT-FAMILY: Trebuchet MS, Candara, Georgia, Calibri, Corbel, serif\">f<\/span>\/3.5 to <span style=\"FONT-STYLE: italic; FONT-FAMILY: Trebuchet MS, Candara, Georgia, Calibri, Corbel, serif\">f<\/span>\/5.6 is an example of a common variable aperture range in a consumer zoom lens.<\/p>\n<table border=\"0\" cellspacing=\"0\" cellpadding=\"0\">\n<tbody>\n<tr>\n<td>\n<div style=\"width: 155px;\">\n<div style=\"padding-bottom: 33px; padding-left: 0px; width: 150px; padding-right: 0px; padding-top: 33px;\">\n<div style=\"width: 120px; margin-left: auto; margin-right: auto;\"><img decoding=\"async\" src=\"http:\/\/upload.wikimedia.org\/wikipedia\/commons\/thumb\/5\/51\/Jonquil_flowers_at_f32.jpg\/120px-Jonquil_flowers_at_f32.jpg\" alt=\"\" width=\"120\" height=\"79\" \/><\/div>\n<\/div>\n<div>\n<p><span style=\"FONT-STYLE: italic; FONT-FAMILY: Trebuchet MS, Candara, Georgia, Calibri, Corbel, serif\">f<\/span>\/32 &#8211; narrow aperture and slow shutter speed<\/div>\n<\/div>\n<\/td>\n<td>\n<div style=\"width: 155px;\">\n<div style=\"padding-bottom: 33px; padding-left: 0px; width: 150px; padding-right: 0px; padding-top: 33px;\">\n<div style=\"width: 120px; margin-left: auto; margin-right: auto;\"><img decoding=\"async\" src=\"http:\/\/upload.wikimedia.org\/wikipedia\/commons\/thumb\/0\/01\/Jonquil_flowers_at_f5.jpg\/120px-Jonquil_flowers_at_f5.jpg\" alt=\"\" width=\"120\" height=\"79\" \/><\/div>\n<\/div>\n<div>\n<p><span style=\"FONT-STYLE: italic; FONT-FAMILY: Trebuchet MS, Candara, Georgia, Calibri, Corbel, serif\">f<\/span>\/5.6 &#8211; wide aperture and fast shutter speed<\/div>\n<\/div>\n<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<p><strong><em>Aperture area<\/em><\/strong><\/p>\n<p>The amount of light captured by a lens is proportional to the area of the aperture, equal to:<\/p>\n<dl>\n<dd><img decoding=\"async\" src=\"http:\/\/upload.wikimedia.org\/math\/a\/d\/c\/adcd8400b9cff8f5ae4ff1cac2074b07.png\" alt=\"\\mathrm{Area} = \\pi \\left({f \\over 2N}\\right)^2\" \/><\/dd>\n<\/dl>\n<p>Where <em>f<\/em> is focal length and <em>N<\/em> is the f-number.<\/p>\n<p>The focal length value is not required when comparing two lenses of the same focal length; a value of 1 can be used instead, and the other factors can be dropped as well, leaving area proportion to the reciprocal square of the f-number <em>N<\/em>.<\/p>\n<p>If two cameras of different format sizes and focal lengths have the same angle of view, and the same aperture area, they gather the same amount of light from the scene. The relative focal-plane illuminance, however, depends only on the f-number <em>N<\/em>, independent of the focal length, so is less in the camera with the larger format, longer focal length, and higher f-number. This assumes both lenses have identical transmissivity.<\/p>\n<p>Hope you EnJOy this, it&#8217;s a little bit technical, but you will understand, I know this for sure.<\/p>\n<p>(Depth Of Field Example)<\/p>\n<p><img loading=\"lazy\" decoding=\"async\" class=\"alignnone size-full wp-image-103\" title=\"_CDL6719\" src=\"https:\/\/cesardphoto.com\/blog\/wp-content\/uploads\/2009\/07\/CDL6719.jpg\" alt=\"_CDL6719\" width=\"500\" height=\"328\" srcset=\"https:\/\/cesardphoto.com\/blog\/wp-content\/uploads\/2009\/07\/CDL6719.jpg 500w, https:\/\/cesardphoto.com\/blog\/wp-content\/uploads\/2009\/07\/CDL6719-300x196.jpg 300w\" sizes=\"(max-width: 500px) 100vw, 500px\" \/><\/p>\n<p><strong>Picrture Information:<\/strong><\/p>\n<p>Camera: Nikon D300 w\/ Sigma 70-200mm f2.8 DG Macro HSM<\/p>\n<p>f-stop: f\/4<\/p>\n<p>Exposure: 1\/80 sec.<\/p>\n<p>ISO\/Speed:  ISO 3200<\/p>\n<p>EV (Exposure Bias): +0.3 Step<\/p>\n<p>Focal Length: 200 mm<\/p>\n<p><strong>As usual, Happy Light Hunting Folks&#8230;.<\/strong><\/p>\n<p>Cesar<\/p>\n","protected":false},"excerpt":{"rendered":"<p>I was watching this morning the last show from DTownTV.com, hummm, again The Minimun Aperture sounds WRONG for me and I am really want to post this, is a compendium of info available for you here, hope you like it. The aperture stop is an important element in most optical designs. Its most obvious feature &hellip; <\/p>\n<p class=\"link-more\"><a href=\"https:\/\/cesardphoto.com\/blog\/2009\/07\/if-we-hunt-for-light-we-need-to-talk-about-f-stop\/\" class=\"more-link\">Read more<span class=\"screen-reader-text\"> &#8220;If we hunt for LIGHT, we need to talk about f-stop&#8230;.&#8221;<\/span><\/a><\/p>\n","protected":false},"author":2,"featured_media":0,"comment_status":"open","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"saved_in_kubio":false,"ngg_post_thumbnail":0,"_jetpack_newsletter_access":"","_jetpack_dont_email_post_to_subs":false,"_jetpack_newsletter_tier_id":0,"_jetpack_memberships_contains_paywalled_content":false,"_jetpack_memberships_contains_paid_content":false,"footnotes":"","jetpack_publicize_message":"","jetpack_publicize_feature_enabled":true,"jetpack_social_post_already_shared":false,"jetpack_social_options":{"image_generator_settings":{"template":"highway","default_image_id":0,"font":"","enabled":false},"version":2},"jetpack_post_was_ever_published":false},"categories":[7,22],"tags":[],"class_list":["post-102","post","type-post","status-publish","format-standard","hentry","category-digitaltips","category-photography"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v27.6 - https:\/\/yoast.com\/product\/yoast-seo-wordpress\/ -->\n<title>If we hunt for LIGHT, we need to talk about f-stop.... - Finding Light in Every Dark Place.<\/title>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/cesardphoto.com\/blog\/2009\/07\/if-we-hunt-for-light-we-need-to-talk-about-f-stop\/\" \/>\n<meta property=\"og:locale\" content=\"en_US\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"If we hunt for LIGHT, we need to talk about f-stop.... - Finding Light in Every Dark Place.\" \/>\n<meta property=\"og:description\" content=\"I was watching this morning the last show from DTownTV.com, hummm, again The Minimun Aperture sounds WRONG for me and I am really want to post this, is a compendium of info available for you here, hope you like it. 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And I saw that the light was good.....&quot;\",\"potentialAction\":[{\"@type\":\"SearchAction\",\"target\":{\"@type\":\"EntryPoint\",\"urlTemplate\":\"https:\\\/\\\/cesardphoto.com\\\/blog\\\/?s={search_term_string}\"},\"query-input\":{\"@type\":\"PropertyValueSpecification\",\"valueRequired\":true,\"valueName\":\"search_term_string\"}}],\"inLanguage\":\"en-US\"},{\"@type\":\"Person\",\"@id\":\"https:\\\/\\\/cesardphoto.com\\\/blog\\\/#\\\/schema\\\/person\\\/2a7145491c201efe5856113b5c9e37b8\",\"name\":\"Cesar L. Diaz\",\"image\":{\"@type\":\"ImageObject\",\"inLanguage\":\"en-US\",\"@id\":\"https:\\\/\\\/secure.gravatar.com\\\/avatar\\\/d015da15ab831457eada0feb89717c73feb3bd7902725ce07a5a274852eb1fb2?s=96&r=pg\",\"url\":\"https:\\\/\\\/secure.gravatar.com\\\/avatar\\\/d015da15ab831457eada0feb89717c73feb3bd7902725ce07a5a274852eb1fb2?s=96&r=pg\",\"contentUrl\":\"https:\\\/\\\/secure.gravatar.com\\\/avatar\\\/d015da15ab831457eada0feb89717c73feb3bd7902725ce07a5a274852eb1fb2?s=96&r=pg\",\"caption\":\"Cesar L. Diaz\"},\"description\":\"Cesar Here!.... Software development run thru my vains from 8 - 5. When not at the Office I drive a Toyota FJ Cruiser Trail Team Edition and a nice Photog Paraphernalia back pack (LowePro Dry Zone 200), inside ===&gt; Nikon Cameras and lenses (Nikon D700, Nikon D300, Nikon F100) and many other tools, of course. Photography and Adventure are ingredients in my day to day life mixed with motorcycles and outdoor activities; and I do want to share My Experiences here with You.\",\"sameAs\":[\"http:\\\/\\\/cesardphoto.com\"],\"url\":\"https:\\\/\\\/cesardphoto.com\\\/blog\\\/author\\\/cesard\\\/\"}]}<\/script>\n<!-- \/ Yoast SEO plugin. -->","yoast_head_json":{"title":"If we hunt for LIGHT, we need to talk about f-stop.... - Finding Light in Every Dark Place.","robots":{"index":"index","follow":"follow","max-snippet":"max-snippet:-1","max-image-preview":"max-image-preview:large","max-video-preview":"max-video-preview:-1"},"canonical":"https:\/\/cesardphoto.com\/blog\/2009\/07\/if-we-hunt-for-light-we-need-to-talk-about-f-stop\/","og_locale":"en_US","og_type":"article","og_title":"If we hunt for LIGHT, we need to talk about f-stop.... - Finding Light in Every Dark Place.","og_description":"I was watching this morning the last show from DTownTV.com, hummm, again The Minimun Aperture sounds WRONG for me and I am really want to post this, is a compendium of info available for you here, hope you like it. The aperture stop is an important element in most optical designs. Its most obvious feature &hellip; Read more \"If we hunt for LIGHT, we need to talk about f-stop&#8230;.\"","og_url":"https:\/\/cesardphoto.com\/blog\/2009\/07\/if-we-hunt-for-light-we-need-to-talk-about-f-stop\/","og_site_name":"Finding Light in Every Dark Place.","article_published_time":"2009-07-10T13:45:49+00:00","article_modified_time":"2009-07-10T14:28:34+00:00","og_image":[{"url":"http:\/\/upload.wikimedia.org\/wikipedia\/commons\/thumb\/8\/87\/Aperture_diagram.svg\/350px-Aperture_diagram.svg.png","type":"","width":"","height":""}],"author":"Cesar L. Diaz","twitter_card":"summary_large_image","twitter_misc":{"Written by":"Cesar L. 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