# 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 ?
For the car sequence, Figures 8 and 9 show the reconstructions with magnification factor [square root of P] = 2, using L =5 and L = 15 LR frames, respectively.
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.e.
We can define magnification factor as A = [r.sub.2N]/[r.sub.1], which is related to the magnifying ability of a hyperlens for the subwavelength source.
Thus, a magnification factor M is introduced to transform the results from the digital image to the physical dimension on the specimen surface:
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This optical design, with a magnification factor of 6X, offers an unprecedented combination of light transmission, eye relief, clarity and versatility.
Riflescopes feature 30mm main tubes, magnification factor of 6x, Fast Diopter Adjustment, eye relief of 4" to 4.5" and fully multicoated and index-matched lenses finished with StonnCoat.
The subscript on the magnification factor indicates that the magnification may be slightly different for the flux entering through the sample port to that for the flux entering through the reference port.
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.

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