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Counterweighting secondary mirror
Counterweighting secondary mirror

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tjr650



Registered: June 2009
Location: Gaithersburg, Maryland
Posts: 21
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In an attempt to reduce the flexure between my main scope and the guide scope, I have added a counterweight to the secondary mirror. The secondary mirror for the Meade LXD75 f/4 SN8 is rather large and hangs off the front corrector. I mounted a brass piece to the back of the secondary support and have a threaded shaft coming out of it with some small lead weights on the end. Fearing I might dump the threaded shaft and damage the corrector, I built a dew cap to protect it.
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Scope used and reducer: Meade LXD75 SN8
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Additional Categories: Equipment photos

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System Admin ( Gene Hunter )

Registered: May 2008
Location: Bethune, SC
Posts: 818
Mon February 8, 2010 10:16

Is the object of the secondary weight to offset the wieight of the secondary on the front surface glass? If so that is an excellent idea that I have never thought of.

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tjr650

Registered: June 2009
Location: Gaithersburg, Maryland
Posts: 21
Mon February 8, 2010 10:44

In the upper left image, the mounting for the corrector is sitting on the gound. If the counterweight wasn't in place, the thing would tip over due to the weight of the seocndary mirror and its support. Counterweighting the secondary on professional telescope is common, but they are, of course, much larger. The secondary mirror on smaller telescope might not need counterweighting, but the one on my SN8 is so large that I thought it would be a good idea to counterweight it.
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