What to do if ...
> Problem
there is vignetting at the edges of the image
ie. the view is not in a perfect circle.
> Operational error
a) The pupil of your eye is not at the centre of
the ocular.
b) The position of the eyecup is not set prop
erly for use with or without glasses.
> Solution
a) Reposition the head e.g. eye at the ocular
until the vignetting disappears.
b) Correct by folding the eyecup down for
eyeglass wearers, or up for those who do
not wear eyeglasses.
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