dsjtecserv Offline Upload & Sell: Off
|
nolaguy wrote:
This rule of thumb is for full frame?... and so would be different for cropped? Or am I missing something?
Yes, the rule of thumb is "calibrated" for 35 mm / full frame as the reference. For other formats you would adjust the denominator in proportion to the crop factor, so the formula would be 400 / (FL * CF), where FL is the lens focal length and CF the crop factor. In addition, note that moon shots are often further cropped in post, to make the moon larger in the frame. Though you may not know how much additional cropping will be done at capture time, it is good to account for this by being even more conservative; if the formula says 1/500 is OK, perhaps make it 1/250!
Dave
|