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For example, a 28 mm lens on the DSLR (given a crop factor of 1.5) would produce the angle of view of a 42 mm lens on a full-frame camera. So, to determine the focal length of a lens for a digital camera that will give the equivalent angle of view as one on a full-frame camera, the full-frame lens focal length must be divided by the crop factor.
Topogon-design lens and auxiliary viewfinder for the Mamiya Press line of cameras. Goerz was merged into the Zeiss Ikon company in 1926. [9] An independent branch of Goerz in America, which had been established in 1895, licensed the Topogon design to Bausch & Lomb, who produced it as the Metrogon for the United States, citing the same US patent as the Topogon.
The Sigma 12–24mm f/4.5–5.6, introduced in 2003, a rectilinear ultra-wide zoom designed for the 35 mm format (both film and digital), providing a slightly wider field of view. The company replaced this lens in 2016 with a version offering the same focal length range but a constant maximum aperture of f/4 .
Cross-section of a typical retrofocus wide-angle lens. Extreme or ultra-wide-angle lens - a wide-angle lens with an angle of view above 90 degrees. [4] Extreme-wide-angle lenses share the same issues as ordinary wide-angle lenses but the focal length of such lenses may be so short that there is insufficient physical space in front of the film ...
Laowa 9 mm f/2.8 super wide angle lens for APS-C, introduced in 2015 Laowa 25 mm 2.5-5x ultra macro lens for full frame, introduced in 2018. The first lens was the 60 mm f/2.8 2 x Ultra Macro, a full frame lens with a magnification factor of 2:1 that could also be focused to infinity which is unique. [8]
Common focal lengths of lenses made for the format include 24, 28, 35, 50, 85, 105, and 135 mm. Most commonly, a 50 mm lens is the one considered normal; any lens shorter than this is considered a wide angle lens and anything above is considered a telephoto lens. Even then, wide angles shorter than 24 mm is called an extreme wide angle.
The term wide-angle lens denotes a lens that has an image circle diameter significantly wider than the lens focal length The Hypergon is a wide angle lens that covers a flat field. It is constructed symmetrically consisting of two deep meniscus elements that almost form a sphere .
A panomorph lens is a particular type of wide-angle lens specifically designed to improve optical performances in predefined zones of interest, or across the whole image, compared to traditional fisheye lenses. [1] [predatory publisher] Some examples of improved optical parameters include the number of pixels, the MTF or the relative illumination.