It's also a great macro lens today, short of the 200mm f/4 AF-D Micro.. Not for: This AF-S lens won't autofocus on the oldest and crummiest AF 35mm cameras and won't work expose properly on any manual-focus 35mm Specs: Focal Length & Maximum Aperture: 10 22mm; 1:3.5-4.5. For macro use, the maximum aperture of a macro lens is not often essential to me as all lenses have my most-used f/8 through f/16 aperture openings. As a result, the lens obtains crisp images with little flare even at the maximum aperture. Acceptably sharp focus" is defined using a property called the "circle of confusion".The depth of field can be determined by focal length, distance to subject, the acceptable circle of confusion size, and That means that if youre using a 50mm lens, an aperture setting os f/2 would be a 25mm hole. In fact, this lens fits right into the mid-range zone of pricing, making it an accessible yet powerful addition to your photography tool kit. Numerical Aperture. For entry-level DSLRs and mirrorless cameras, you probably need to open a menu (possibly the quick menu) and find the section for ISO. The 50mm focal length (75mm equivalent on DX format cameras) with a fast f/1.8 aperture allows you to capture stunning images with a shallow depth-of-field, letting your subjects stand out from their backgrounds. F/4 refers to it being 1/4 of the way open. Artistic Photography with Pinhole Cameras. For macro use, the maximum aperture of a macro lens is not often essential to me as all lenses have my most-used f/8 through f/16 aperture openings. For cameras that can only focus on one object distance at a time, depth of field is the distance between the nearest and the farthest objects that are in acceptably sharp focus. " Buy Sigma 150-600mm f/5-6.3 DG OS HSM Contemporary Lens for Canon EF featuring EF-Mount Lens/Full-Frame Format, Aperture Range: f/5 to f/22, One FLD Element, Three SLD Elements, Super Multi-Layer Coating, Hyper Sonic Motor AF System, OS Image Stabilization, Removable, Rotating Tripod Collar, Rounded 9-Blade Diaphragm. Review Sigma null For example, f/2 refers to your lens aperture being half-open. Along with focal length, you will also find maximum aperture printed on your camera lens. Formula symbol: NA. A smaller hole allows less light to hit the sensor, darkening your photos. Lens Construction: 13 elements in 10 groups. The 28-200mm F2.8-5.6 is the first *1 all-in-one zoom lens for full-frame mirrorless cameras to offer a maximum aperture of F2.8. To start, enter a mode that lets you select the ISO yourself. But for even greater reach, the lens includes a matched 1.25x teleconverter (TC 800-1.25E). Get out of Auto mode, and go to Manual, Shutter Priority, Aperture Priority, or Program (we tend to prefer Aperture Priority or Manual). Encyclopedia > letter N > numerical aperture. The maximum aperture opening tends to be of most interest and is always included Pinhole photography, one of the oldest forms of the art, is making a comeback. In botany, a stoma (from Greek , "mouth", plural "stomata"), also called a stomate (plural "stomates"), is a pore found in the epidermis of leaves, stems, and other organs, that controls the rate of gas exchange.The pore is bordered by a pair of specialized parenchyma cells known as guard cells that are responsible for regulating the size of the stomatal opening. Aperture is the opening in the camera lens. The 24mm focus is tailor-made for most of the sensors available on the market today. Image stabilizer: Yes. The 28-200mm F2.8-5.6 is the first *1 all-in-one zoom lens for full-frame mirrorless cameras to offer a maximum aperture of F2.8. f/5.6, f/2.8, f/2). One of the three most important settings in photography is Shutter Speed, the other two being Aperture and ISO.Shutter speed is responsible for two particular things: changing the brightness of your photo and creating dramatic effects by either freezing action or blurring motion. The camera equation, or G#, is the ratio of the radiance reaching the camera sensor to the irradiance on the focal plane of the camera lens. Review Sigma null Maximum Aperture. Categories: general optics, fiber optics and waveguides. Where to Find Aperture on a Nikon Lens. In the same lens, f/4 would be 12.5mm, and so on. This manual focus lens features a large f1.4 aperture and is made of 13 elements in 12 groups. For example, f/2 refers to your lens aperture being half-open. Ideal Uses: Perfect for use as a general-purpose medium tele on mirrorless (with FTZ), FX DSLR, DX DSLR and most 35mm AF cameras. Units: (dimensionless) How to cite The 28-200mm F2.8-5.6 is the first *1 all-in-one zoom lens for full-frame mirrorless cameras to offer a maximum aperture of F2.8. The camera equation, or G#, is the ratio of the radiance reaching the camera sensor to the irradiance on the focal plane of the camera lens. It has a Super Spectra Coating to help reduce flaring. Formula symbol: NA. Yongnuo AF-S 100mm f/2.0 is a high-aperture telephoto lens with a fixed focal length. The camera equation, or G#, is the ratio of the radiance reaching the camera sensor to the irradiance on the focal plane of the camera lens. F/4 refers to it being 1/4 of the way open. Moreover, it is inexpensive. It is compatible with a range of cameras that features a Canon EF mount. It maintains outstanding performance throughout the entire zoom range, and aperture values of F3.5 at 50mm, F4.5 at 100mm, F5.6 at 200mm. Its commonly written with f/stop on the camera lens (e.g. Encyclopedia > letter N > numerical aperture. Yes. On full-frame cameras, the lens is a high-quality wide-angle lens perfect for street, landscape and architectural shooting. On full-frame cameras, the lens is a high-quality wide-angle lens perfect for street, landscape and architectural shooting. But for even greater reach, the lens includes a matched 1.25x teleconverter (TC 800-1.25E). The 24mm focus is tailor-made for most of the sensors available on the market today. The Canon EF 600mm f/4L IS III USM Lens forms part of the L-series from the Canon brand. Its simple format allows you to take unique photos that you can't always capture with a DSLR.For many people, pinhole cameras serve as an introduction to photography, and it's likely that you even built your own as a kid.Among other reasons, Review Sigma null On a DX-format camera, it's zoom range is equivalent to Nikon's 24-120mm FX lens (35mm The lens also offers an f/4L constant maximum aperture exposure. Using over 50 years of lens making experience, particularly the knowledge gained from the 35 millimeter 1.4 Art and the 50 millimeter 1.4 Art, the 24 millimeter 1.4 Art is aimed at being the new standard for fast aperture wide angle prime lenses. The lens's f/1.4 speed, meanwhile, is perfect for available-light shooting. One of the three most important settings in photography is Shutter Speed, the other two being Aperture and ISO.Shutter speed is responsible for two particular things: changing the brightness of your photo and creating dramatic effects by either freezing action or blurring motion. An image of a bird captured using fast shutter speed. But for most situations and applications, the difference is marginal, and what you may sacrifice in image quality you gain with the convenience of a zoom range. As the longest lens in the NIKKOR lineup, the AF-S NIKKOR 800mm f/5.6E FL ED VR delivers an astounding 800mm (1200mm equivalent on DX-format cameras) of super-telephoto reach with a fast f/5.6 maximum aperture in a rugged, well-balanced design. On full-frame cameras, the lens is a high-quality wide-angle lens perfect for street, landscape and architectural shooting. It is the best portrait lens Nikon for amateur photographers. With a maximum aperture of f/1.8 its very fast and performs very well in low light but it is also compact enough to not worry about the size/weight when taking it on adventures. Dont worry, you wont have to calculate these numbers every time you go on a shoot. Along with focal length, you will also find maximum aperture printed on your camera lens. Angle of View (APS-C) : 32 It is the best portrait lens Nikon for amateur photographers. Format. The maximum usable aperture of a lens is specified as the focal ratio or f-number, defined as the lens's focal length divided by the effective aperture (or entrance pupil), a dimensionless number. Previously, I had been using the Sony 35mm f/2.8 lens which is incredibly compact but I often felt limited in low light by the f/2.8 maximum aperture. The maximum aperture opening tends to be of most interest and is always included Buy Sigma 150-600mm f/5-6.3 DG OS HSM Contemporary Lens for Canon EF featuring EF-Mount Lens/Full-Frame Format, Aperture Range: f/5 to f/22, One FLD Element, Three SLD Elements, Super Multi-Layer Coating, Hyper Sonic Motor AF System, OS Image Stabilization, Removable, Rotating Tripod Collar, Rounded 9-Blade Diaphragm. In this case, f /0.95 is currently the maximum aperture (the widest opening on a full-frame format for practical use), and f /22 is the minimum aperture (the smallest opening). Its simple format allows you to take unique photos that you can't always capture with a DSLR.For many people, pinhole cameras serve as an introduction to photography, and it's likely that you even built your own as a kid.Among other reasons, The lens's f/1.4 speed, meanwhile, is perfect for available-light shooting. The lens also offers an f/4L constant maximum aperture exposure. Image stabilizer: Yes. Lens speed refers to the maximum aperture diameter, or minimum f-number, of a photographic lens.A lens with a larger than average maximum aperture (that is, a smaller minimum f-number) is called a "fast lens" because it can achieve the same exposure as an average lens with a faster shutter speed.Conversely, a smaller maximum aperture (larger minimum f-number) is "slow" Praised for its reliability and overall image quality, this is a long-time favorite lens of passionate professionals. Format. Moreover, it is inexpensive. Its commonly written with f/stop on the camera lens (e.g. Buy Sigma 150-600mm f/5-6.3 DG OS HSM Contemporary Lens for Canon EF featuring EF-Mount Lens/Full-Frame Format, Aperture Range: f/5 to f/22, One FLD Element, Three SLD Elements, Super Multi-Layer Coating, Hyper Sonic Motor AF System, OS Image Stabilization, Removable, Rotating Tripod Collar, Rounded 9-Blade Diaphragm. In this case, f /0.95 is currently the maximum aperture (the widest opening on a full-frame format for practical use), and f /22 is the minimum aperture (the smallest opening). Yongnuo AF-S 100mm f/2.0 is a high-aperture telephoto lens with a fixed focal length. Weather seals: Yes. For cameras that can only focus on one object distance at a time, depth of field is the distance between the nearest and the farthest objects that are in acceptably sharp focus. " But for even greater reach, the lens includes a matched 1.25x teleconverter (TC 800-1.25E). It maintains outstanding performance throughout the entire zoom range, and aperture values of F3.5 at 50mm, F4.5 at 100mm, F5.6 at 200mm. To start, enter a mode that lets you select the ISO yourself. And by adjusting the aperture setting on your camera, you can adjust the size of the aperture (and, in turn, affect a photos brightness). The maximum aperture opening tends to be of most interest and is always included Built-in Optical SteadyShot image stabilization and 7-blade circular aperture for beautiful defocus effects ; Minimum Focus Distance : 1.28 ft (0.39 m), Maximum Magnification ratio : 0.16x, Focal-Length : 50 mm and filter diameter (mm) is 49 mm ; Large F1.8 maximum aperture enables beautiful defocusing effects. This ratio is related to the image-space numerical aperture when the lens is focused at infinity. Using over 50 years of lens making experience, particularly the knowledge gained from the 35 millimeter 1.4 Art and the 50 millimeter 1.4 Art, the 24 millimeter 1.4 Art is aimed at being the new standard for fast aperture wide angle prime lenses. For macro use, the maximum aperture of a macro lens is not often essential to me as all lenses have my most-used f/8 through f/16 aperture openings. YONGNUO YN50mm F1.8 C Lens Large Aperture Auto Focus Lens 50mm/f1.8 for Canon EOS DSLR Cameras YN50mm F1.8 C Multiple View-angle Standard Fixed Focal Prime Lens for Camera displayed, this prime lens supports 3 types of view-angle coverage, that is 46-degree diagonal, 27-degree vertical and 40-degree horizontal one. F2 bright and large aperture helps blur the background and highlight the subject, which affects the quality of portraits they turn out to be extraordinary. A larger hole allows more light to hit the sensor, lightening your photos. The 50mm focal length (75mm equivalent on DX format cameras) with a fast f/1.8 aperture allows you to capture stunning images with a shallow depth-of-field, letting your subjects stand out from their backgrounds. It's also a great macro lens today, short of the 200mm f/4 AF-D Micro.. Not for: This AF-S lens won't autofocus on the oldest and crummiest AF 35mm cameras and won't work expose properly on any manual-focus 35mm The specifications for a given lens typically include the maximum and minimum aperture sizes, for example, f /0.95 f /22. YONGNUO YN50mm F1.8 C Lens Large Aperture Auto Focus Lens 50mm/f1.8 for Canon EOS DSLR Cameras YN50mm F1.8 C Multiple View-angle Standard Fixed Focal Prime Lens for Camera displayed, this prime lens supports 3 types of view-angle coverage, that is 46-degree diagonal, 27-degree vertical and 40-degree horizontal one. Nano Crystal Coat. Built-in Optical SteadyShot image stabilization and 7-blade circular aperture for beautiful defocus effects ; Minimum Focus Distance : 1.28 ft (0.39 m), Maximum Magnification ratio : 0.16x, Focal-Length : 50 mm and filter diameter (mm) is 49 mm ; Large F1.8 maximum aperture enables beautiful defocusing effects. In the same lens, f/4 would be 12.5mm, and so on. A smaller hole allows less light to hit the sensor, darkening your photos. Encyclopedia > letter N > numerical aperture. f/ 2.8. For cameras that can only focus on one object distance at a time, depth of field is the distance between the nearest and the farthest objects that are in acceptably sharp focus. " Its simple format allows you to take unique photos that you can't always capture with a DSLR.For many people, pinhole cameras serve as an introduction to photography, and it's likely that you even built your own as a kid.Among other reasons, It is compatible with a range of cameras that features a Canon EF mount. f/ 2.8. As a result, the lens obtains crisp images with little flare even at the maximum aperture. In botany, a stoma (from Greek , "mouth", plural "stomata"), also called a stomate (plural "stomates"), is a pore found in the epidermis of leaves, stems, and other organs, that controls the rate of gas exchange.The pore is bordered by a pair of specialized parenchyma cells known as guard cells that are responsible for regulating the size of the stomatal opening. The maximum usable aperture of a lens is specified as the focal ratio or f-number, defined as the lens's focal length divided by the effective aperture (or entrance pupil), a dimensionless number. A larger hole allows more light to hit the sensor, lightening your photos. But for most situations and applications, the difference is marginal, and what you may sacrifice in image quality you gain with the convenience of a zoom range. Definition: sine of the maximum angle of an incident beam of some optical device, or the sine of the acceptance angle of a waveguide or fiber. Get out of Auto mode, and go to Manual, Shutter Priority, Aperture Priority, or Program (we tend to prefer Aperture Priority or Manual). The specifications for a given lens typically include the maximum and minimum aperture sizes, for example, f /0.95 f /22. Angle of View (APS-C) : 32 That means that if youre using a 50mm lens, an aperture setting os f/2 would be a 25mm hole. Acronym: NA. Previously, I had been using the Sony 35mm f/2.8 lens which is incredibly compact but I often felt limited in low light by the f/2.8 maximum aperture. YONGNUO YN50mm F1.8 C Lens Large Aperture Auto Focus Lens 50mm/f1.8 for Canon EOS DSLR Cameras YN50mm F1.8 C Multiple View-angle Standard Fixed Focal Prime Lens for Camera displayed, this prime lens supports 3 types of view-angle coverage, that is 46-degree diagonal, 27-degree vertical and 40-degree horizontal one. Diagonal Angle of View: 107 30 63 30 f/ 2.8. Weather seals: Yes. That said, a wide aperture makes creative blurs easier, as shown by the 105mm f/2.8 example below. Numerical aperture is not typically used in photography.Instead, the angular aperture of a lens (or an imaging mirror) is expressed by the f-number, written f / or N, which is defined as the ratio of the focal length f to the diameter of the entrance pupil D: =. The 20mm F1.8G lens employs two precision AA (Advanced Aspherical) elements to maximize resolution and effectively compensates for field curvature and astigmatism that can be problematic in wide-angle lenses, achieving high corner-to-corner resolution even with the narrow depth-of-field produced at the lenss maximum F1.8 aperture. Artistic Photography with Pinhole Cameras. F2 bright and large aperture helps blur the background and highlight the subject, which affects the quality of portraits they turn out to be extraordinary. Nano Crystal Coat. This manual focus lens features a large f1.4 aperture and is made of 13 elements in 12 groups. The lens is outfitted with 2 high-refraction lens elements and new Gaussian optics, which combine to eliminate astigmatism and suppress astigmatic difference. Pinhole photography, one of the oldest forms of the art, is making a comeback. The 20mm F1.8G lens employs two precision AA (Advanced Aspherical) elements to maximize resolution and effectively compensates for field curvature and astigmatism that can be problematic in wide-angle lenses, achieving high corner-to-corner resolution even with the narrow depth-of-field produced at the lenss maximum F1.8 aperture. F2 bright and large aperture helps blur the background and highlight the subject, which affects the quality of portraits they turn out to be extraordinary. Praised for its reliability and overall image quality, this is a long-time favorite lens of passionate professionals. Maximum Aperture. Lens speed refers to the maximum aperture diameter, or minimum f-number, of a photographic lens.A lens with a larger than average maximum aperture (that is, a smaller minimum f-number) is called a "fast lens" because it can achieve the same exposure as an average lens with a faster shutter speed.Conversely, a smaller maximum aperture (larger minimum f-number) is "slow" Acronym: NA. This ratio is related to the image-space numerical aperture when the lens is focused at infinity. How to get the best-quality lens. With a fast fixed aperture of f/2.8 across a 2470mm zoom range, this lens provides both fine resolution and natural representation. For entry-level DSLRs and mirrorless cameras, you probably need to open a menu (possibly the quick menu) and find the section for ISO. FX/35mm. A must-have for standard portraits and everyday use, the AF-S NIKKOR 50mm f/1.8G is a lens that will absolutely surprise you. To start, enter a mode that lets you select the ISO yourself. Numerical Aperture. It has a Super Spectra Coating to help reduce flaring. The Canon EF 600mm f/4L IS III USM Lens forms part of the L-series from the Canon brand. And by adjusting the aperture setting on your camera, you can adjust the size of the aperture (and, in turn, affect a photos brightness). That means that if youre using a 50mm lens, an aperture setting os f/2 would be a 25mm hole. Acceptably sharp focus" is defined using a property called the "circle of confusion".The depth of field can be determined by focal length, distance to subject, the acceptable circle of confusion size, and Weather seals: Yes. Unleash your creativity. An image of a bird captured using fast shutter speed. f/5.6, f/2.8, f/2). The lens is outfitted with 2 high-refraction lens elements and new Gaussian optics, which combine to eliminate astigmatism and suppress astigmatic difference. With a maximum aperture of f/1.8 its very fast and performs very well in low light but it is also compact enough to not worry about the size/weight when taking it on adventures. Buy Lensbaby Velvet 56mm f/1.6 SE Lens for Canon EF (Silver) featuring EF Mount Lens/Full-Frame Format, Aperture Range: f/1.6 to f/16, Singlet-Doublet-Singlet Optical Design, Soft Glowing Effect at Wide Apertures, Inspired by Classic Portrait Lenses, 1:2 Magnification, 5" Working Distance, Manual Focus and Exposure Control, All-Metal Lens Barrel, Filter Thread: The specifications for a given lens typically include the maximum and minimum aperture sizes, for example, f /0.95 f /22. German: numerische Apertur. A must-have for standard portraits and everyday use, the AF-S NIKKOR 50mm f/1.8G is a lens that will absolutely surprise you. F/4 refers to it being 1/4 of the way open. Buy Lensbaby Velvet 56mm f/1.6 SE Lens for Canon EF (Silver) featuring EF Mount Lens/Full-Frame Format, Aperture Range: f/1.6 to f/16, Singlet-Doublet-Singlet Optical Design, Soft Glowing Effect at Wide Apertures, Inspired by Classic Portrait Lenses, 1:2 Magnification, 5" Working Distance, Manual Focus and Exposure Control, All-Metal Lens Barrel, Filter Thread: Categories: general optics, fiber optics and waveguides. Format. It maintains outstanding performance throughout the entire zoom range, and aperture values of F3.5 at 50mm, F4.5 at 100mm, F5.6 at 200mm. Unleash your creativity. Angle of View (APS-C) : 32 Specs: Focal Length & Maximum Aperture: 10 22mm; 1:3.5-4.5. A must-have for standard portraits and everyday use, the AF-S NIKKOR 50mm f/1.8G is a lens that will absolutely surprise you. Tamrons 70-210mm lens has the same f/4 constant aperture rating but is much less expensive to buy. Aperture refers to the size of the opening where light passes through to the sensor. This ratio is related to the image-space numerical aperture when the lens is focused at infinity. Dont worry, you wont have to calculate these numbers every time you go on a shoot. Formula symbol: NA. It's also a great macro lens today, short of the 200mm f/4 AF-D Micro.. Not for: This AF-S lens won't autofocus on the oldest and crummiest AF 35mm cameras and won't work expose properly on any manual-focus 35mm Pinhole photography, one of the oldest forms of the art, is making a comeback. With a fast fixed aperture of f/2.8 across a 2470mm zoom range, this lens provides both fine resolution and natural representation. In fact, this lens fits right into the mid-range zone of pricing, making it an accessible yet powerful addition to your photography tool kit. Lens Construction: 13 elements in 10 groups. Maximum aperture: f/3.5-4.5. For entry-level DSLRs and mirrorless cameras, you probably need to open a menu (possibly the quick menu) and find the section for ISO. And by adjusting the aperture setting on your camera, you can adjust the size of the aperture (and, in turn, affect a photos brightness). Maximum aperture: f/3.5-4.5. Units: (dimensionless) How to cite A smaller hole allows less light to hit the sensor, darkening your photos. Image stabilizer: Yes. With a maximum aperture of f/1.8 its very fast and performs very well in low light but it is also compact enough to not worry about the size/weight when taking it on adventures. Meet the world's lightest 5x zoom lens with an f/2.8-4 aperture*, which is excellent for softening foregrounds or backgrounds and highlighting your subject. Built-in Optical SteadyShot image stabilization and 7-blade circular aperture for beautiful defocus effects ; Minimum Focus Distance : 1.28 ft (0.39 m), Maximum Magnification ratio : 0.16x, Focal-Length : 50 mm and filter diameter (mm) is 49 mm ; Large F1.8 maximum aperture enables beautiful defocusing effects. Categories: general optics, fiber optics and waveguides. The 20mm F1.8G lens employs two precision AA (Advanced Aspherical) elements to maximize resolution and effectively compensates for field curvature and astigmatism that can be problematic in wide-angle lenses, achieving high corner-to-corner resolution even with the narrow depth-of-field produced at the lenss maximum F1.8 aperture. Aperture is the opening in the camera lens. On a DX-format camera, it's zoom range is equivalent to Nikon's 24-120mm FX lens (35mm Lens speed refers to the maximum aperture diameter, or minimum f-number, of a photographic lens.A lens with a larger than average maximum aperture (that is, a smaller minimum f-number) is called a "fast lens" because it can achieve the same exposure as an average lens with a faster shutter speed.Conversely, a smaller maximum aperture (larger minimum f-number) is "slow" Dont worry, you wont have to calculate these numbers every time you go on a shoot. Definition: sine of the maximum angle of an incident beam of some optical device, or the sine of the acceptance angle of a waveguide or fiber. Previously, I had been using the Sony 35mm f/2.8 lens which is incredibly compact but I often felt limited in low light by the f/2.8 maximum aperture. Using over 50 years of lens making experience, particularly the knowledge gained from the 35 millimeter 1.4 Art and the 50 millimeter 1.4 Art, the 24 millimeter 1.4 Art is aimed at being the new standard for fast aperture wide angle prime lenses. An image of a bird captured using fast shutter speed. Numerical Aperture. FX/35mm. FX/35mm. Numerical aperture is not typically used in photography.Instead, the angular aperture of a lens (or an imaging mirror) is expressed by the f-number, written f / or N, which is defined as the ratio of the focal length f to the diameter of the entrance pupil D: =. The lens also offers an f/4L constant maximum aperture exposure. Unleash your creativity. Diagonal Angle of View: 107 30 63 30 Meet the world's lightest 5x zoom lens with an f/2.8-4 aperture*, which is excellent for softening foregrounds or backgrounds and highlighting your subject. The lens is outfitted with 2 high-refraction lens elements and new Gaussian optics, which combine to eliminate astigmatism and suppress astigmatic difference. Numerical aperture is not typically used in photography.Instead, the angular aperture of a lens (or an imaging mirror) is expressed by the f-number, written f / or N, which is defined as the ratio of the focal length f to the diameter of the entrance pupil D: =. For example, f/2 refers to your lens aperture being half-open. It is compatible with a range of cameras that features a Canon EF mount. Aperture is the opening in the camera lens. The maximum usable aperture of a lens is specified as the focal ratio or f-number, defined as the lens's focal length divided by the effective aperture (or entrance pupil), a dimensionless number. It is the best portrait lens Nikon for amateur photographers. Specs: Focal Length & Maximum Aperture: 10 22mm; 1:3.5-4.5. In the same lens, f/4 would be 12.5mm, and so on. German: numerische Apertur.
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