Shown is a weighted adapter to convert 2" to 1 1/4 " tube size for using small
eyepieces and large eyepieces without disturbing the telescope balance.
A commercial adapter made by TeleVue is shown on the left and a home made version
is shown on the right. As it turns out, when the adapter is made from
brass to the correct size, it is also just about the right weight to make small
eyepieces and large ones weigh the about same. This allows the telescope
to remain in balance when eyepieces are changed. The adapter should weigh
somewhere between 12 and 14 ounces. One could tune the weight for
a particular large/small eyepiece set, but that is not necessary. The
heavy adapter reduces the weight difference from about 12 ounces to within a
few ounces for almost any large/small pair. The TeleVue adapter is beautifully
made as one expects. It weighs 12 ounces. One might note that a
small 1 1/4" eyepiece might weigh about 4 ounces while the 20 mm Nagler
weighs 48 ounces. This extreme small/large pair weight difference may require
re-balancing the telescope even with a weighted adapter.
Here is shown the homemade adapter with the standard 26 mm Meade eyepiece.
Note that the adapter has, at the left end, a threaded ring which will take
standard 48 mm filters.
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