How far do I need to extend bellows to achieve particular minimum focal length
106963
How can I calculate what the effect of an extension tube will be?
13284
Extension of an unfixed spring
1032
What is the reference point that the focal length of a lens is calculated from?
56915
Is there a dynamic-range reduction device (preferably passive, optical)?
22161
How do I get adequate depth of field in macro photography?
20168
Wide Angle Lens on a Step Down ring?
31075
What can be done using a 18-55mm lens?
136881
Extend volume where unallocated space lies ahead of it
53448
Do bigger focal lengths capture more light?
76156
Stretch length of horizontal and vertical springs
153578
Variable focal length for macro lenses?
1684
How to maximise contrast range of distant landscapes with blue haze?
151884
How do I set focus range?
111238
Can you extend a Canon Rebel T5's exposure length?
101960
Why are crop lenses indicated with focal lengths they don't have?
28748
How to increase camera frames view area?
113839
How can I visualize or simulate the effect of different focal lengths?