Tagged Questions
1
vote
3answers
219 views
Is it possible to calculate focal length if you know the aperture?
I need focal length (for my IA homework), but I didn't know that in real world I would only get the aperture.
Ok, my camera is an Olympus X-21, and manual says:
-----Olympus lens: 6.3 to 18.9 mm, ...
5
votes
3answers
613 views
What is the formula for percent of frame filled at a specific distance and focal length?
I am thinking about buying a new lens specifically to take photos of distant targets (birds, bears, etc). I currently own the Canon 70-300 IS USM, which is a nice lens, but I find that if I want to ...
