Sensor sizes smaller than small format are expressed in a ratio that describes the diagonal measurement of the frame. For example, a 1/1.7" sensor is 1 ÷ 1.7 = .588", and a 2/3" sensor is 2 ÷ 3 = .666". This gives a rough means of comparison, but doesn’t take into consideration the aspect ratio.
It also doesn’t take into consideration pixel density (the amount of photosites per square millimeter). One sensor of a given size may have a higher pixel density than another of the same size, but that doesn’t necessarily mean that it has a higher resolution. This is because the photosites in a more densely packed sensor are smaller, and have less light gathering ability. This can lead to increased noise, which ultimately degrades resolution.
Here’s a comparison of some of the many different sensor sizes used in digital cameras of all types, along with their physical dimensions, crop factors, aspect ratios, area and some of the cameras they’re used in. Each image is created actual size, although they may appear differently depending on the screen dimensions and resolution of you computer’s display.
Medium Format
crop factor 0.66x, aspect ratio 4:3, area 1,728mm²
Used in the Mamiya RZ33 (33MP) medium format DSLR
Kodak KAF-37500 (Leica) (45mm x 30mm)crop factor 0.80x, aspect ratio 3:2, area 1,350mm²
Used in the Leica S2 (37.5MP) medium format DSLR.
Small Format
35mm Full Frame (36mm x 24mm)crop factor 1.0x, aspect ratio 3:2, area 864mm²
Used in 135 film cameras, Canon EOS 5D Mark II (21.1MP) ; Leica M9 (18MP), Nikon D3X (24.5MP), D700 (12MP), Sony a900 (24.6MP).
Also Known as Nikon FX
crop factor 1.26, aspect ratio 3:2, area 513mm²
Used in older Canon DSLRs
crop factor 1.33x, aspect ratio 3:2, area mm²
Used in Leica M8.2 (10.3MP)
APS-C (Nikon) (23.6mm x 15.7mm)crop factor 1.5x, aspect ratio: 3:2, area 370.5mm²
Used in APS film cameras; Fujifilm Finepix X100 (12.3MP); Nikon D300S (12MP), D7000 (16.2MP), D90 (12MP), D5100 (16.2MP), D3100 (14.2); Pentax K5 (16.3MP), Kr (12.4MP); Samsung NX200 (20.3MP); Sony a580 (16.2); NEX-7 (24.3MP)
Also known as Nikon DX
crop factor 1.6x aspect ratio 3:2, area 328.6mm²
Used in Canon DSLRs
Premium
Four Thirds (17.3mm x 13mm)crop factor 2.0x, aspect ratio 4:3, area 224.9mm²
Used in Four Thirds and Micro Four Thirds cameras; Lumix DMC-G2, DMC-GF2, DMC-GH2, DMC-G3; Olympus E5 DSLR, PEN E-P3, E-P2, E-PL3, E-PM1
crop factor 2.7x, aspect ratio 3:2, area 116.2mm²
Used in Nikon 1 V1, J1
crop factor 2.5x, aspect ratio 4:3, area 122.9mm²
Used in commercial video surveillance cameras.
2/3" (8.8mm x 6.6mm)crop factor 3.6x, aspect ratio 4:3, area 58.1mm²
Used in Fujifilm Finepix X10 (12MP).
1/1.7" (7.6mm x 5.7mm)crop factor 4.21x, aspect ratio: 4:3, area 43.3mm²
Used in “bridge” and “premium” mid-sized cameras; Canon PowerShot G12 (10.1MP), PowerShot S95 (10.1MP); Nikon Coolpix P7100 (10.1MP), Coolpix P5100 (12.1MP).
Compact
1/2.3" (6.16mm x 4.62)crop factor 5.19x, aspect ratio: 4:3, area 28.5mm²
Used in compact “shirt pocket” cameras, Canon PowerShot SD780 IS (12.1MP), Nikon Coolpix S series; Pentax Q, Optio, RZ series.
1/2.5" (5.76mm x 4.29mm)crop factor 5.59x, aspect ratio 4:3, area 24.7mm²
Used in compact “shirt pocket” cameras.
crop factor 7x, aspect ratio 4:3, area 15.3mm²
Used in the iPhone 4S (8MP)
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