Ring E
Pull Screw
Push Screw
Ring D
Necessity of the focuser squaring adjustments
Focuser Squaring Adjustments
• There is a set of six adjustment screws on the D ring and E ring
respectively which are placed at even intervals.
• The adjustment screws on the D ring work as push screws and the
ones on the E ring work as pull screws.
• The squaring adjustments can be done with the supplied Allen key
(1.5mm).
• Choose a set of any three of the six push screws at 120 degrees
apart on the D ring for the adjustments. Loosen a set of the
remaining three push screws in advance as they are used along
with adjustment screws.
• Slightly loosen two push screws on the side you want to bring
toward you and tighten the corresponding two pull screws.
• After the squaring adjustments finish, tighten the set of the three
supportive adjustment screws lightly.
Caution
How to return the focuser position to the factory default
Loosening all the push screws and then tightening all the pull screws will bring the focuser position to the initial setting at the Vixen’s factory.
The VSD100F3.8 produces a very flat focal plane that can detect a subtle misalignment of the mount* of a camera used. The resulting image
will not be sharp on part of the focal plane if you use a medium size camera with a large imaging sensor like 645D format. *It is within the
tolerance of the specifications.
Be sure to read this complete page before you make these adjustments.
The focuser squaring adjustments are subject to your clear understanding and acceptance of the following:
(1) To secure the focuser squaring adjustments, the camera must be attached to the focuser in the same position and orientation as it was
attached to the focuser at the squaring adjustments; otherwise, the image will not be entirely sharp.
(2) To secure the focuser square adjustments, a rotation of the imaging frame must be done by rotating the whole optical tube. A rotation of the
imaging frame with the camera adapter ring only will produce an image that is not completely sharp.
(3) To secure the focuser squaring adjustments, the same camera should be used with the optical tube for astrophotography. Attaching a
different camera to the optical tube will require the focuser squaring adjustments be performed again with the camera being used.
(1) The focuser squaring adjustments are set at Vixen’s factory and re-adjustments of this part are not generally needed. The focuser squaring
adjustment described here is a highly technical method designed for professionals and experienced amateurs who have ample knowledge of
complex technology and equipment for astro-imaging with a large format imaging sensor. Never touch this part if you are not comfortable
with complex technology.
(2) Vixen does not provide details or endorse your adjustment of the focuser squaring. It is the users responsibility for the focuser squaring
adjustments if you proceed with the adjustments.
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