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If an image does not come into focus with a particular eyepiece
because you run out of outward focus travel, you may need to
use the included 2" extension adapter. This adapter threads
onto the focuser drawtube. First, you’ll need to remove the 2"
accessory collar from the drawtube by unthreading it (
Figure
35a). Then thread the 2" extension adapter into the drawtube
(
Figure 35b). Insert a 2" eyepiece into the extension adapter
and secure it with the two thumbscrews. Or, to use 1.25" eye-
piece with the extension adapter, insert and secure the 1.25"
adapter in the extension adapter, then insert the eyepiece into
the 1.25" adapter.
Viewing with Eyeglasses
If you wear eyeglasses, you may be able to keep them on
while you observe, if your eyepieces have enough eye relief
to allow you to see the whole field of view. You can try this by
looking through the eyepiece first with your glasses on and
then with them off, and see if the glasses restrict the view
to only a portion of the full field. If they do, you can easily
observe with your glasses off by just refocusing the telescope
as needed. If you suffer from severe astigmatism, however,
you may find images noticeably sharper with your glasses on.
Magnification
Magnification, or power, is determined by the focal length of
the telescope and the focal length of the eyepiece. Therefore,
by using eyepieces of different focal lengths, the resultant
magnification can be varied.
Figure 35. (a)
Removing the 2" accessory collar,
(b)
Thread the
2" extension adapter into the focuser drawtube.
2" extension
adapter
2" accessory
collar
a.
b.
