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An optical 'zoom' or 'variable focal length' lens is one that has a range of focal lengths at which it can operate. "Digital zoom" is a technology which simulates optical zoom by cropping the image.
3
votes
Do photographers avoid using zoom?
Composing the shot involves repositioning yourself and the camera, and filling the frame involves selecting the appropriate lens OR using the zoom. … If you don't have a zoom, then you're into switching between primes. Would all your prime lenses have the same maximum aperture? …
1
vote
Blurry without zoom, sharp with zoom
It might be part of the focussing mechanism sticking, so maybe "exercising it" by alternately focussing on near and far objects in wide zoom mode could help. … Occasionally though, images can appear soft at the wide end of the zoom,
I think more due to a focusing error than a quality issue with the
optics, as some images turn out sharp, other unfortunately …