How can I calculate the change an extension tube makes to the maximum magnification of a lens? [duplicate]
Possible Duplicate: How can I calculate what the effect of an extension tube will be? My understanding is that extension tubes increase the magnification of lenses by reducing their minimum ...
Is there a website / app that will tell you approximately how much distance a person should move so that they are able to frame the same shot at different focal lengths? Say for example, I'm ...
How do I calculate the object size when I have focal length = 25mm distance to object = 700mm CCDs pixel size = 4,4µm ? My camera is this one. Appreciated! Edit: Could this work: real height ...
A lot of people have asked if we can measure the distance of an object in photo. But I was wondering if we can measure the size of an object in photo. Of course assuming we know everything from sensor ...