My lens's focus ring can be twisted past infinity and the close-focus stops without ever hitting a hard stop— is it defective?
62759
Why am I allowed to turn my focusing ring beyond infinity?
71282
AF mirror not flipping on Canon 350D
107782
Does light reflect if incident at exactly the critical angle?
108640
Why an I getting Err 01 with my Canon camera and lens?
63434
Technically, why is the out of focus area blurred more when using a bigger aperture?
8199
Is this dust on lens or something else?
45800
How can I get everything in focus? (Why can't my camera just use all of its focus points at the same time?)
20168
Wide Angle Lens on a Step Down ring?
135594
Spotlight with Halo applied is creating rings around light
33211
How do I diagnose the source of focus problem in a camera?
137893
A half covered lens
74906
What causes an f/0 error on a Nikon D700?
114324
Is there any protection ring available for reversed lenses?
7392
Why is my Nikon 50mm f/1.8 giving me an fEE error?
132199
How to lock aperture using Reverse ring with Canon 600D?
71803
Nikkor 70-200 f2.8 VRII - Aperture not working?
58821
How can the aperture value written in Exif be larger than the nominal limit of the lens?