All Questions
5
questions
0
votes
1
answer
72
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Question on f-number and exposure [duplicate]
Is there any mathematical proof to show that the exposure in a camera is independent of the focal length used, if the f-number (ratio of focal length to lens diameter) remains constant?
- 177
1
vote
2
answers
718
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Relationship between f-number and amount of light being let into the lens system [duplicate]
Why does smaller f-number imply greater aperture diameter and consequently, greater amount of light entering the lens of a camera?
As evidenced from my study across a number of resources, an absolute ...
- 177
0
votes
1
answer
346
views
Nikon F - Lens with Built-in Autofocus Motor and Manual Aperture Ring
My question is as follows, is there such thing as a nikon-f mount lens that has a built in autofocus motor and a manual aperture ring? Or do the two contradict each other? The camera model is Nikon ...
- 139
6
votes
6
answers
2k
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Is it important that the Canon 1DX isn't specified to autofocus with lenses slower than f/5.6? [closed]
Seeking the lens market AND the related info WRT Canon 1D X, I found some things which seems concerning:
1st, a note from Canon's Chuck Westerfall (see here) saying:
“AF is unavailable on the EOS-...
- 4,495
4
votes
2
answers
3k
views
AF-D vs AF-G: is the aperture ring necessary?
I just purchased a Nikon D7000 with an 18-105 f/3.5-5.6 AF-S lens. I'm also looking at purchasing a lens around the 200-300mm focal length range, and I found the 70-300mm f/4-5.6 AF lens. As far as I ...
- 143
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