© Baader Planetarium GmbH | 2020
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Setting the Interpupillary Distance
Interpupillary distance (the separation between the centres of the eyes' pupils) varies
from person to person. The binoviewer should be adjusted to match your interpupillary
distance. Using both hands, hold the body of the binoviewer like a pair of binoculars.
While viewing a distant object (daytime) or a bright star field, rotate the two halves of
the binocular body about the central pivot until you see the field of view as a single
sharp circle with both eyes.
Adjusting Left-Right Focus (Diopter Compensation)
Many people require a different focus setting for their left and right eyes. That's why
you set a different distance to the body of the binocular for each eyepiece. This diopter
adjustment can be easily achieved. Adjust the focus of both eyepieces as follows:
1. Set the inner rings for the diopter compensation (marked with Up/Down) to
somewhere in the middle. If you rotate them, you'll see how the upper end of the
eyepiece clamp moves.
2. With the telescope aimed at an object, close the right eye and look into the left
eyepiece. Using the telescope's focus mechanism, adjust until the image is sharp.
3. Close the left eye and with the right eye look into the right eyepiece. Rotate the
right eyepiece holder until you see a sharp image. If you reach the limit of the focus
travel, use the telescope's focus mechanism to adjust the image until it is sharp
– then switch back to the left eye and rotate the left eyepiece holder for a sharp
image.
4. Now you can look with both eyes into the eyepieces. You can now focus for differ-
ent eyepieces or addition of other components to the optical path by using just the
telescope's focus mechanism.
Please note:
If the dioptric differ-
ence between your eyes is very large
(more than 5 – 6 diopters), you may
find that even with one eyepiece
holder adjusted fully in and the other
fully out, you cannot bring both to
focus. If so, you may want to view
while wear- ing your eyeglasses.
Alternatively, you may unlock the
eyepiece in the fully extended holder
and lift it out a few millimeters to
compensate for the strong difference
between your eyes.
The lower ring collar is used for the diopter adjust-
ment – compare the position of the eyepiece clamp
on the left and on the right.
