Why am I able to set wider aperture than my lens technically allows?
141557
Is Sigma 150-600mm f 5-6.3 contemporary "F4-5.6" on Crop Sensor?
52368
Does the diameter of the aperture increase with increases in the focal length with constant F-number(F-stops)?
54122
Why does using a tilt-shift lens make things look miniature?
56452
What happens to waves when they hit smaller apertures than their wavelenghts?
123305
ND Filter not Dense enough - How do I get long exposures in very bright situations, where my ND filter isn't enough?
128028
Why can't my dSLR take close-up photos?
79766
What does it really mean that telephoto lenses "flatten" scenes?
150402
Is it normal for focal length to change while focusing?
71946
How to get tack sharp portraits with shallow DOF when lacking an AF point where I want to focus?
74363
Why is the bokeh shaped like the aperture?
43047
Why do some lenses cost 10 times as much when the specs are very close?
111238
Can you extend a Canon Rebel T5's exposure length?
141771
What is the benefit of a wide-aperture lens if you stop it down?
6544
How do zoom lenses restrict their widest aperture at the telephoto end?
10570
Does sensor size affect lens distortion?
109652
What is the limiting factor in lens construction when it comes to f-stop values?
148895
Why can't I turn the focus ring on my Vivitar 100-300mm far enough to get infinity focus?