References
Thin lens diagram
Reference Table
Variable |
Definition |
b |
The distance between the image and the lens |
B |
The size of the image |
f |
The distance between the lens and the focal point, also
known as the focal length. 1/f = 1/b + 1/g |
g |
The distance between the scene and the lens |
G |
The size of the scene |
m |
Magnification. If m < 1, then it is actually a reduction. |
Standard CCD sizes
CCD size |
Width |
Height |
2/3" |
8.8mm |
6.6mm |
1/2" |
6.4mm |
4.8mm |
1/4" |
4.8mm |
3.6mm |
1/3" |
3.2mm |
2.4mm |
Standard lens focal lengths
Focal length |
12 |
16 |
25 |
50 |
75 |