How does focal length relate to macro magnification?
11197
How do I convert lens focal length (mm) to x-times optical zoom?
37632
How to compare the focal length of a 50mm prime lens with the default lens of a point and shoot camera?
47999
How do you find out the "sweet spot" of a lens?
63434
Technically, why is the out of focus area blurred more when using a bigger aperture?
116428
How do I use a Macro Lens for Jewelry Photography?
60690
Optical microscope magnification limits?
126293
Relationship between slit size and wavelength in diffraction
60038
How do depth of field and the circle of confusion relate to pixel size on the sensor?
70481
Relationship between the the slit width $w$ and source distance $d$
8552
Which focal-length lens is usually used for portrait photography, and why?
86838
What do the red values mean on the distance scale of a lens?
54122
Why does using a tilt-shift lens make things look miniature?
51290
Does my crop sensor camera actually turn my lenses into a longer focal length?
22161
How do I get adequate depth of field in macro photography?
46184
What should I consider when purchasing a macro lens?
21744
Focal length of an ellipse and related results
131677
What does the 'macro' mode on my camera actually do?