Forum: Pentax SLR Lens Discussion
11-08-2017, 06:29 AM
|
|
As far as I know, there is no DA * 400mm, but the simplified answer is yes.
If my math is right, 400mm f/5.6 at ISO100 on APS-C or crop mode is roughly like using 600mm f/8.5 at ISO400 on FF on full mode.
EDIT: and 300/4 on crop is like 450/6 on FF.
|