Westminster fountain at sunset

by Jorge Córdoba

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7
votes
3answers
924 views

Why do cameras have mirror system?

I know the differences between a rangefinder and a SLR/DSLR but what is the real reason to put a mirror in front of a lens to reflect light into the viewfinder? It raises lens prooduction price when ...
8
votes
2answers
4k views

When should I turn on the rangefinder of the D3100?

There is a "set rangefinder on" kind of option in D3100. Are there any special cases when I "should" set the rangefinder on?