IL3 User’s Guide
11S-3002B
page 95
Appendix K: Crop Factor
Crop Factor is a term used in digital photography that expresses the size of the sensor image plane
as compared to that of 35mm film. In Figure 8-11 through Figure 8-13, below, the Black border
represents the image on 35mm film, the Red border represents the image on the sensor using the
same focal length lens.
Diagonal of 35mm film / Diagonal of the Sensor area used = Crop Factor
The diagonal of 35mm film is 43.3, compared to the 22.95mm diagonal of the IL3, you get a crop
factor of 1.89:
43.3mm / 22.95mm = 1.89
The photographic advantage of knowing the crop factor is that if you know the lens you would use
for a given field of view with a 35mm camera, you can divide the crop factor into that number to
give you the focal length of the lens with the same field of view for your IL3. For example, if you are
using a 125mm lens on your 35mm SLR, you will need about a 65mm lens on the IL3 at full resolution
(125mm / 1.89 = 66.14).
H-Res
V-Res
Diagonal Crop Factor
1280
1024
22.95
1.89
1280
720
20.56
2.11
1024 1024
20.27
2.14
1280
256
18.27
2.37
800
600
14.00
3.09
1024
600
16.62
2.61
640
480
11.20
3.87
800
480
13.06
3.32
512
512
10.14
4.27
320
240
5.60
7.73
320
200
5.28
8.20
256
256
5.07
8.54
Figure 8-11:
Crop Factor 1280 x 1024
Figure 8-12:
Crop Factor 1280 x 720
Figure 8-13:
Crop Factor 800 x 600
Table 8-7: Crop Factor
Содержание IL3
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