All Questions
4
questions
4
votes
3
answers
180
views
Why is that the wider the aperture of a lens is, the more we can see through narrow cracks and crevices?
Example I took at 85mm f/1.4 on APS-C sensor:
- 41
3
votes
6
answers
4k
views
Why do we need a DOF preview button?
Why not just show the effective depth of field, by default?
What's the point of having it display a picture that's different to how the image will actually turn out?
My first thought was, it must be ...
- 615
5
votes
3
answers
681
views
How do waterproof lenses focus underwater?
Our eyes need air in front of them to be able to focus properly, that's why when we go swimming using goggles, our surroundings are much clearer than without.
So my question is, how do waterproof ...
- 1,896
2
votes
2
answers
2k
views
Help me understand effective f-number
If I set a lens to, say, f/2 but my focus is set to its closest point, my effective f-number won't be f/2 any more but it will be higher by a factor that depends on focal length, image magnification ...
- 265
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