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Results tagged with focal-length
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user 39046
Focal length is the distance (measured in mm) between the surface of a lens and the focal point, when the lens is focussed at infinity. Smaller focal lengths indicate wide-angle lenses, larger focal lengths indicate a telephoto lens.
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What is the importance of the back focal length of a lens?
What is the effect and importance of the back focal length of a lens?
For instance, if I look at these two lenses by Ricoh, they have the same focal length and aperture, but their back focal lengths …
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