APS-C
From Wikipedia, the free encyclopedia
Advanced Photo System type-C (APS-C) is an image sensor format approximately equivalent in size to the Advanced Photo System "classic" size negatives. These negatives were 25.1 × 16.7 mm and had an aspect ratio 3:2.
Sensors meeting these approximate dimensions are used in many digital single-lens reflex cameras, in addition to a few large-sensored live-preview digital cameras (such as the Sony DSC-R1 and the Sigma DP1) and a few digital rangefinders (e.g. the Epson R-D1). Such sensors exist in many different variants depending on the manufacturer and camera model[1]. All APS-C variants are considerably smaller than 35 mm standard film which measures 36×24 mm. Sensor sizes range from 20.7×13.8 mm to 28.7×19.1 mm. Each variant results in a slightly different angle of view from lenses at the same focal length and overall a much narrower angle of view compared to 35 mm film.
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[edit] Brand Designations
Most DSLR and third party lens manufacturers now make lenses specifically designed for APS-C cameras. The designations by brand include:
[edit] Multiplier factors
A focal length multiplier (FLM) also known as a "crop factor" can be used to calculate the 35 mm equivalent focal length from the actual focal length. The most common multiplier ratios (in order of announcements):
- 1.6× — Canon EOS 40D, Canon EOS 400D, Canon EOS 30D, Canon EOS 450D, Canon EOS 20Da, Canon EOS 350D, Canon EOS 20D*, Canon EOS 300D*, Canon EOS 10D*, Canon EOS D60*, Canon EOS D30*
- 1.5× — all Nikon DSLR cameras except the Nikon D3, all Fuji DSLR cameras, all Sony DSLR cameras except their future flagship model, all Konica Minolta DSLR cameras.
- 1.3×↑ — Canon EOS-1D Mark III, Canon EOS-1D Mark II N, Canon EOS-1D Mark II*, Canon EOS-1D*
- 1.53× — Pentax *istD*, Pentax *istDs*, Pentax *istDs2*, Pentax *istDL*, Pentax *istDL2*, Pentax K100D*, Pentax K100D Super, Pentax K10D
(* discontinued)
↑ - A 1.3× Focal Length Multiplier is also known as APS-H
[edit] Lens differences, incompatibilities
Lenses with 1.6× multiplier — also called crop — such as the Canon EF-S line, place the rear of the lens closer to the camera's sensor (referred to as Short Back Focus). This has several benefits, including increasing the focal range. It also has drawbacks, in that the lenses aren't compatible with camera bodies that use a full-frame sensor, as it would damage the mirror, and thus these lenses can't be used on other digital or analog bodies.
Cameras capable of using short-back lenses include the Canon EOS 300D, 350D, 400D and 450D (also known as the Digital Rebel, the Digital Rebel XT, the Digital Rebel XTi, and the Digital Rebel XSi respectively), as well as the 20D, 30D, and 40D. These cameras support conventional 35 mm lenses as well.
[edit] See also
[edit] References
- ^ Sensor Sizes, DPreview.com.
