Optika Italy B-1000 Serie Manuel D'instructions page 36

IV. Viewing tube assembly
The field of view of the two eyes is dif-
ferent
V. Microphotography and video
The image is unfocused
The edge of the image is unfocussed
Bright patches appear on the image
The interpupillar distance is not correct Adjust the interpupillar distance
The dioptric correction is not right
The viewing technique is not correct,
and the operator is straining the eye-
sight
Incorrect focussing
To some degree, it is inherent to the
nature of achromatic objectives
Stray light is entering the microscope
through the eyepieces and through the
camera viewfinder
Page 36
Adjust the dioptric correction
When look into the objective, do not
stare at the specimen but look at the
whole field of view. Periodically, move
the eyes away to look at a distant ob-
ject, then back into the objective
Adjusting the focus system as in the
present manual
The problem can be minimized by a
correct setting of the aperture dia-
phragm
Cover the eyepieces and the viewfind-
er with a dark cloth