Why can lenses only focus from so close?
44637
What are the constructional differences between a macro and a regular lens?
11625
Canon 50mm f1.4 no longer focuses reliably
79654
What is the effect of the number of cross-type focus points on sharp focus?
14182
How to ensure sharp focus when shooting with an open aperture?
7818
How can I get dramatic shallow DOF with a kit lens?
81660
Does autofocus work better with f/2.8 lenses vs f/4 or slower?
657
How can I take a photo with everything in focus with my DSLR?
58074
Physics of Focusing a Laser
29080
How do extension tubes affect focusing distance?
12506
What exactly determines depth of field?
22161
How do I get adequate depth of field in macro photography?
71946
How to get tack sharp portraits with shallow DOF when lacking an AF point where I want to focus?
94456
Why does my one lens have different exposure (t-stop) than my other lens?
96544
Why don't lens mount adapters have the same effect as extension tubes?
9671
Do gravitational lenses have a focus point?
156969
How does autofocus work?
10820
What is the formula for percent of frame filled at a specific distance and focal length?