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0
votes
3answers
200 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, ...
2
votes
1answer
248 views
How to understand the definition of dynamic range?
I have the following formula:
DR=(1.4L_Sat G_i)/N_D
where DR is the dynamic range;
L_sat is the luminance at the “margin level”，70.1% of the maximum recordable （saturation）luminance（yes，L_sat is ...
9
votes
5answers
1k views
Is there a formula to calculate DOF?
I am pretty clear about that DOF depends on:
Focal length
Aperture
Distance from subject
Sensor size
and more (as pointed in the comment).
But what is the question here is: Is there any formula ...
4
votes
1answer
153 views
Effect to reduce width of photo without cropping or stretching
I saw a documentary a few years ago (about 5) demonstrating a photographic manipulation formula, which can reduce the width of an image, without stretching, or cropping. It would do this by ...
2
votes
1answer
188 views
How much does extending affect range of focusing distances?
It's well known that moving a lens away from imaging surface will decrease both minimum and maximum focusing distance. There are times when it would be good to know how much those distances will ...
5
votes
3answers
595 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 ...
0
votes
2answers
138 views
Correct conversion formula for photos to NTSC?
Working on some scholastic sports mutlimedia pieces, finished project to go on DVD. Last season (the one the got all the parents stoked) I didn't do conversions, thinking they would just go on ...
