crop factor

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crop factor

The ratio of the focal length of a digital camera lens to a 35mm still camera lens. The crop factor is used by experienced photographers, who want to know the field of view of a lens on a digital camera as compared to a lens on an analog 35mm camera, which they have been using for years.

The Sensor Is Often Smaller
The size of a 35mm film frame is 36 x 24mm. In high-end digital cameras, the sensor may be the same size ("full-frame"); however, most digital camera sensors are smaller (see table below). The difference in size creates the crop factor, also called the "lens factor," "focal length conversion factor" and "lens multiplier."

Multiply by the Crop Factor
As an example, a crop factor of 1.5 means an 18mm focal length on the digital camera is equivalent to 27mm on a 35mm camera (18 times 1.5). See APS-C, focal length and f-stop.

STILL CAMERA FRAME SIZES                  Approximate                  Size in MMAnalog Film       (Rounded)

  35mm              36 x 24 

  APS-C             25 x 17
  APS-H             30 x 17
  APS-P             30 x 10


  Digital Sensor

  Canon (APS-C)     22 x 15
  Canon (APS-H)     29 x 19

  Four Thirds       17 x 13

  Foveon            21 x 14

  Nikon CX          13 x 9
  Nikon DX (APS-C)  24 x 16
  Nikon FX          36 x 24

  Pentax (APS-C)    24 x 16

  Sony (APS-C)      24 x 16
References in periodicals archive ?
Dynamic magnification factor in a box-shape steel girder.
Diewert shows that the share of primary inputs in total input use will yield a close estimate of the magnification factor under the assumption that the ratio of growth factors of primary inputs and total inputs will be close to one (i.
However, the magnification factor A of thin structure is small and this means the magnifying ability of the system is also weak.
where M is a constant magnification factor associated with the experimental setup, which is largely dependent on the digital camera; [u.
The magnification factor for the transmitted and scattered fluxes is set to the same value since both fluxes enter the IS through the same entrance aperture.
Wide-angle lenses toward the lowest magnification factor are often called "fisheye" lenses and may produce rounded effects or bending of vertical objects within your photos.
I returned the "kid stuff and for less money bought real stuff: An honest tripod, a binoculars mount and a good pair of 8x42 binoculars (8 refers to the magnification Factor and 42 is the millimeter diameter of the lens).
This vector is then drawn with a magnification factor that allows it to be visualized on a higher scale than the raw data.
Other features of the camera include a high-quality zoom lens with a magnification factor of up to 2.
Of course, the size of the exit pupil and field of view differ due to the magnification factor, but those are the only differences.
Emmert said he hadn't noticed the change in aspect ratio, probably because it hasn't much changed the magnification factor from a CCD array that is smaller than a 35mm frame, boosting effective focal length by a factor of 1.