What will be my aperture with a 2× teleconverter?
24842
Does using an extender actually change the aperture of the lens?
98701
If a lens focuses all incoming light to a point, how do we get 2D images?
52368
Does the diameter of the aperture increase with increases in the focal length with constant F-number(F-stops)?
14182
How to ensure sharp focus when shooting with an open aperture?
113839
How can I visualize or simulate the effect of different focal lengths?
38465
Does a Nikon DX lens on a FX camera get subjected to the 1.5X crop factor?
60690
Optical microscope magnification limits?
83556
What are the theoretical minimum and maximum apertures?
25536
What are the consequences of stacking a circular polarizer on top of a UV filter?
42808
Simply bad focus or too big aperture?
63434
Technically, why is the out of focus area blurred more when using a bigger aperture?
10570
Does sensor size affect lens distortion?
101715
In which situations should I use my circular polarizing filter?
65660
How to calculate the signal-to-noise ratio (SNR) in an image?
85837
What's the difference between real and effective aperture?
83545
What configuration would limit my DSLR's shutter speed to 1/200?
80219
What is the relationship between field of view and focal length for fisheye?