Samyang AE 8 F3.5 CS II fish-eye with SFH-14 filter holder
18161
How would one use filters with the "bulb"-like shape front element lenses?
87931
Sign convention for mirror and lens formulas
134185
Gain of an active filter without calculating the transfer function with two OP-AMPs
115330
Why isn't it safe to use EF-S lenses on fullframe?
72651
How do I mount a qcow2 disk image?
98410
How to shop for a lens filter?
21122
Real time filtering vs Apply filters button?
105343
Interference at the focus of a convex lens or a concave mirror
85095
Selecting optical size?
81907
RC filter with an square wave input
123305
ND Filter not Dense enough - How do I get long exposures in very bright situations, where my ND filter isn't enough?
52967
Can screw-on macro lenses produce decent results?
34186
Point Stacker in combination with other filter
101715
In which situations should I use my circular polarizing filter?
101195
Digitally selectable filter
89980
How to initialize the elements of the filter matrix?
106533
Why is a physical anti-aliasing filter still needed on modern DSLRs?