altura 8mm F/3.5 Aspherical fisheye, Руководство пользователя

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Problem: Images are too bright
Solution: Raise the f-stop on the lens, and/or raise shutter speed,
and/or raise ISO settings on camera.
Problem: Images are not coming out in focus
Solutions:
a) Adjust the focusing distance on the lens to the correct distance.
b) In certain photographic situations, you may find it easier to
focus at f/5.6-8 rather than f/3.5.