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FOCUSERS
Crayford-Style Non-Rotatable Focuser
This focuser has a flat plane on the bottom side of the drawtube that rides along a roller
assisted by ball bearings to smoothly adjust the focus.
On this 2” focuser, the tension and locking screws are both located on the bottom of the
focuser, with the smaller of the two serving as the locking mechanism that holds the
focus dials stationary.
Crayford-Style Rotatable Focuser
This focuser has a flat plate installed on the bottom side of the drawtube that rides
along a roller assisted by ball bearings to smoothly adjust the focus.
On this 2” focuser, the tension and locking screws are both located on the bottom of
the focuser, with the center most of the two serving as the locking mechanism that
holds the focus dials stationary. This focuser is also rotatable, meaning that it can be
easily repositioned to change the position of the dials or to meet your specific comfort or
viewing needs. To use this feature, slightly loosen the tension screw on top of the visual
back adapter on your telescope tube that presses down on the focuser, rotate the focuser
and gently retighten the screw.
Feather Touch 3” Focuser
This special edition 3” Feather Touch focuser made by Starlight Instruments is
designed for use on our 152mm ED Triplet Carbon Fiber Telescope. It is an extremely
high-quality rack and pinion focuser. On the Feather Touch, the tension screw is located
on the top of the focuser, and the locking screw is on the bottom. This focuser is also
rotatable, meaning that it can be easily repositioned to change the position of the dials
or to meet your specific comfort or viewing needs. To use this feature, slightly loosen the
three tension screws on the visual back adapter on your telescope tube that press down
on the focuser. Rotate the focuser and gently retighten the screws.
INSTALLING YOUR FOCUSER
The following is the procedure you should follow to install your focuser if it was not
already on the telescope tube when you receive it or if you are changing focusers. One
end of the focuser has the tension collar that secures a diagonal or eyepiece to the
focuser. The other has a “lipped” end that fits directly into the visual back adapter on your
telescope tube. Once the focuser housing is inserted into the visual back adapter, gently
tighten down the set screws at the juncture to secure the focuser in place.
ADVANCED TENSION ADJUSTING TECHNIQUE FOR CRAYFORD-STYLE FOCUSERS
Most tension adjustments on our Crayford-style focusers can be easily accomplished by
using the tension screw on the bottom of each model. However, if you feel more tension
is needed, there are sets of small screws on the top of each device that can be used to
adjust the pressure that is coming down on the drawtube from above. To make these
adjustments, you will first need to loosen the button head screws (which are the largest
in the sets) using a hex wrench. For these screws, which serve as locking screws, you
will need a 2mm hex wrench for the Non-Rotatable Crayford-Style and a 2.5mm for the
Rotatable Crayford-Style. Once the button heads are loose, you can begin by carefully
Summary of Contents for TWILIGHT Series
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