What is the purpose of condenser lenses in the slide projector shown below?
47641
what is the purpose of condenser lens in a slide projector?
4389
How can a lens with a single focal length focus on more than one plane?
18161
How would one use filters with the "bulb"-like shape front element lenses?
44131
\AtEveryBibitem{\clearfield{Title}} in beamer?
108572
Converting beamer slides to animated images
55860
What is the purpose of Views "Attachment", "Content pane" & "Context"?
141980
What are these fuse-looking cartridge case components on small, battery operated RF tranceivers?
38712
Diffraction by a lens
34475
Spherical mirror ray diagram question
110812
Magnifying power of concave mirrors
56821
Why does depth of field occur?
119931
Theorem boxes in beamer
126391
Three polarizers, 45° apart
132284
Why does the camera output an image with multi-colors not shown by the naked eye under the projector?
145622
How do constant aperture zoom lenses work?
158181
How does the lens diameter influence photo quality?
33875
What are the biggest differences between Reversal Rings, Extension Tubes and Macro Lenses?