JeanFreli
Automotive
- Mar 11, 2014
- 51
I would like to know what to expect between a focal lens 125mm and a focal lens 250mm? Is there a difference in focal lenghts I should use. I mean for example if I use -3.3 for focal lenght on ss with the 125, do I have to use, let say -4.3 with the 250. Is the power increase?