Why are lens apertures usually 1.4, 1.8, 2.8, 4...?
70690
Why are only certain shutter speeds or apertures available?
87632
How do I find the thread diameter of my lens?
12994
Is it physically possible to build a long zoom (17-300 mm for example) at an aperture value of around 1.4 or 1.2?
80219
What is the relationship between field of view and focal length for fisheye?
3867
is it normal to get significant lens flare with a 50mm f/1.8 prime lens?
86838
What do the red values mean on the distance scale of a lens?
96544
Why don't lens mount adapters have the same effect as extension tubes?
109652
What is the limiting factor in lens construction when it comes to f-stop values?
81660
Does autofocus work better with f/2.8 lenses vs f/4 or slower?
47999
How do you find out the "sweet spot" of a lens?
60038
How do depth of field and the circle of confusion relate to pixel size on the sensor?
44637
What are the constructional differences between a macro and a regular lens?
91299
What does a megapixel designation on a lens actually mean?
124074
Does stacking more lens filters decrease overall image quality?
52368
Does the diameter of the aperture increase with increases in the focal length with constant F-number(F-stops)?
6544
How do zoom lenses restrict their widest aperture at the telephoto end?
94456
Why does my one lens have different exposure (t-stop) than my other lens?