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A Siemens chart filter in a collimator, used for auto-focus calibration of digital still cameras. In the field of video production, where it is often called a back focus chart, the Siemens star is widely used to adjust the back focus of removable lenses. It is also used during film or video shoots to help setting the focus in special situations.
A 1951 USAF resolution test chart is a microscopic optical resolution test device originally defined by the U.S. Air Force MIL-STD-150A standard of 1951. The design provides numerous small target shapes exhibiting a stepped assortment of precise spatial frequency specimens.
Diagram illustrating the flange focal length of an SLR–type and a mirrorless–type camera. For an interchangeable lens camera, the flange focal distance (FFD) (also known as the flange-to-film distance, flange focal depth, flange back distance (FBD), flange focal length (FFL), back focus [1] or register, depending on the usage and source) of a lens mount system is the distance from the ...
2,048,000 2 Pentax EI2000/Hewlett Packard 912 2,012 1,324 2,663,888 2.74 Nikon D1: 2,048 1,536 3,145,728 3 Canon PowerShot A75, Nikon Coolpix 995: 2,160 1,440 3,110,400
Similar CR is camera right, slang CIF: Catch in focus. A technique for allowing a camera to be pre-focussed to a defined spot, and the exposure is only made when a subject is in focus at that spot. Also called trap focus. CMOS: Complementary metal oxide semiconductor. A semiconductor technology, used to create photosensor arrays for some ...
Therefore, reduced–depth-of-field effects will require smaller f-numbers (and thus potentially more difficult or complex optics) when using small-format cameras than when using larger-format cameras. Beyond focus, image sharpness is related to f-number through two different optical effects: aberration, due to imperfect lens design, and ...
The hyperfocal distance is, therefore, the most desirable distance on which to pre-set the focus of a fixed-focus camera. It is worth noting, too, that if a camera is focused on s = ∞, the closest acceptable object is at L 2 = sh/(h + s) = h/(h/s + 1) = h (by equation 21). This is a second important meaning of the hyperfocal distance.
The RMA 1946 Resolution Chart was transmitted by NTS and NOS in the Netherlands, SRG SSR in Switzerland, [18] VRT and RTBF in Belgium, RTP in Portugal, TVP in Poland, TVB in Hong Kong, [citation needed] Venevisión in Venezuela (525-lines variant; in conjunction with Indian-head test pattern), [citation needed] WISN-TV in Milwaukee, Wisconsin (525-lines variant) [19] and on low-powered ...