Travel arrangements with Sigma Lenses?
11607
What lenses to bring while traveling? One good wide-telephoto or several smaller ones?
14182
How to ensure sharp focus when shooting with an open aperture?
138978
Is optical image stabilization a necessary feature for any lens?
41048
If I have a 18-55mm lens, is there a point in buying a 35mm prime lens?
104610
What focal length lens do I need for photographing the moon?
73785
How can one use a reversing ring with Nikon G lenses?
114324
Is there any protection ring available for reversed lenses?
114778
What is the difference between DX format and FX format lenses, and which to choose for what purpose?
101736
What is the difference between Canon "L" lenses and non-L lenses?
10956
How do I choose a macro lens for a Canon APS-C camera?
19003
How will old M42 lenses work on a Nikon camera?
75927
Can I use old Pentax lenses on newer Pentax DSLRs?
11197
How do I convert lens focal length (mm) to x-times optical zoom?
152115
Can I convert binocular zoom to equivalent lens focal length?
158181
How does the lens diameter influence photo quality?
26351
What macro techniques offer an alternative to expensive optics?
19971
Can I use Canon lenses on a Nikon dSLR?