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FOCUSERS
tightening the four smaller screws equally using a 2mm hex wrench. It is important to
make sure each of the four screws is tightened the same amount to avoid giving the
drawtube an awkward and unbalanced tilt. Also be sure to make these adjustments in
very small increments. If you make these screws too tight, the drawtube will not glide
smoothly. If you make them too loose the drawtube will have difficulty maintaining its
position. Once you are done adjusting the smaller screws, retighten the larger locking
screws.
EXTENSION TUBES
Some observing situations and accessories require more back focus than your focuser
alone may be able to provide. Extension tubes aid in fixing this problem by extending the
length of the drawtube. To install extension tubes, unthread the tension collar at the end
of the focuser, thread the extension tube right onto the focuser tube and then rethread
the tension collar onto the end of the extension tube. Depending on your needs you may
want to use more than one extension tube. If that is the case, simply thread one tube
onto the other before replacing the tension collar. You can then install your diagonal or
eyepiece.
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