All Questions
4
questions
0
votes
2
answers
2k
views
How do I correctly convert from aperture diameter into f-stops?
I'd like to know whether it's possible to convert the radius of the focal point into f-stops properly. The following equation illustrates that the diameter is dependent on the f-stop:
$$ \text{...
- 297
1
vote
3
answers
1k
views
Can I estimate the light gathering power of a lens by measuring size of entrance pupil?
Supposing I have an unknown lens of which I don't know f/# and focal length. I want to estimate the total amount of light that my lens can collect which, I believe, is given by the solid angle that my ...
- 265
5
votes
1
answer
604
views
Lens f-number and speed on adapted lenses
A lens has a focal length, and its entrance pupil has a diameter. The ratio of these is an f-number. The size of the entrance pupil is limited by the size of the front element, and we describe lenses ...
- 173
2
votes
5
answers
9k
views
is the Nikon 35mm f/1.8 worth it after i have the kit lenses? [duplicate]
I have a Nikon DX (D5100) camera with the two most basic kit lenses: 18-55mm f/3.5-5.6 VR and 55-200mm f/4-5.6 VR. These two lenses cover lots of scenarios, but I'm starting to believe there is more ...
- 253
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