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The edges are cropped off, which is equivalent to zooming in on the center section of the imaging area. The ratio of the size of the full-frame 35 mm format to the size of the smaller format is known as the "crop factor" or "focal-length multiplier", and is typically in the range 1.3–2.0 for non-full-frame digital SLRs.
Because the image sensors in many digital cameras are smaller than the 24 mm × 36 mm image area of full-frame 35 mm cameras, a lens of a given focal length gives a narrower field of view in such cameras. Sensor size is often expressed as optical format in inches. Other measures are also used; see table of sensor formats and sizes below.
Sensor size Crop factor Focal length [a] Aperture Pixel count Weight EVF Release year Availability Leica Q3 43 Full frame: 1.0 43mm f / 2.0 60 MP 772g Yes 2024 Current [1] Leica Q3: Full frame: 1.0 28mm f / 1.7 60 MP 743g Yes 2023 Current [2] Leica Q2: Full frame: 1.0 28mm f / 1.7 47 MP 734g Yes 2019 Discontinued [3] Leica Q / Q-P: Full frame ...
35 mm equivalent focal lengths are calculated by multiplying the actual focal length of the lens by the crop factor of the sensor. Typical crop factors are 1.26× – 1.29× for Canon (1.35× for Sigma "H") APS-H format, 1.5× for Nikon APS-C ("DX") format (also used by Sony, Pentax, Fuji, Samsung and others), 1.6× for Canon APS-C format, 2× for Micro Four Thirds format, 2.7× for 1-inch ...
Drawing showing the relative sizes of sensors used in most current digital cameras. Advanced Photo System type-C (APS-C) is an image sensor format approximately equivalent in size to the Advanced Photo System film negative in its C ("Classic") format, of 25.1×16.7 mm, an aspect ratio of 3:2 and Ø 30.15 mm field diameter.
2/3 inch bayonet mount DVCPRO HD 137 Mbit/s 1920 x 1080 60 (interlaced) Panasonic AJ-HPX3100GJ [72] 2/3" CCD x 3 4.09 2/3 inch bayonet mount AVC-Intra 100, DVCPRO HD 68 Mbit/s 1920 x 1080 30 (60) Panasonic AK-SHB800GJ [73] [74] Full frame 35mm CMOS EF lens mount 8K: Panasonic AU-EVA1 Full frame 35mm MOS 1.5 EF lens mount SDHC, SDXC
The Q3 has a stabilized 28 mm f / 1.7 Summilux lens with digital crop modes corresponding to 35 mm equivalent focal lengths of 35, 50, 75, and 90 mm. The Q3 features a 60-megapixel CMOS full-frame sensor, measuring 36 x 24 mm — the same resolution and perhaps the same sensor found in the Leica M11 and the Sony α7R V. [3]
A 50 mm (focal length) lens on an APS-C image sensor format (crop factor 1.6) images a slightly smaller field of view than a 70 mm lens on a 35 mm sensor format camera (full frame sensor). A 80 mm lens (1.6 × 50 mm = 80 mm) with a full frame camera gives the same field of view as this 50 mm lens and APS-C sensor format combination produces.