V. Microphotography:
Image edge is unfocused
Bright spots appear on the image
To a certain extent it is due to achro-
matic objectives features
Stray light entering in the microscope
through eyepieces or camera viewfind-
er
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To minimize the problem, set the aper-
ture diaphragm in a proper position
Cover eyepieces and viewfinder with a
dark cloth