Comparing two of my cameras for pixel density. I want to know what is the focal length multiplier if I crop the sensor image 1:1 at Full HD (1920 x 1080). I use Full HD as the benchmark as I often crop to this size for making desktop pictures.
| Camera |
D7100 |
V2 |
Max res
|
6000 x 4000
|
4608 x 3072
|
| Eff pixels |
24 M
|
14 M
|
| Sensor size |
23.5 x 15.6 mm
|
13.2 x 8.8 mm |
Focal length multiplier
|
36 / 23.5 = 1.53x
|
36 / 13.2 = 2.73x
|
Linear density
|
255 pix/mm
|
349 pix/mm
|
Sensor width at Full HD
|
7.52 mm
|
5.5 mm
|
Focal length multiplier at Full HD
|
4.78x
|
6.55x |
Focal length multiplier at Full HD with TC1.4
|
6.69x
|
9.16x |
|