
The biggest problem with telescopic viewfinders is that you always trade magnification for field of view. I really didn't want to part with my Celestron 9x50 viewfinder (which is really good) so I bought the Telrad. Installation on a conventional pipe should be trivial. In my case, I have half a Serrurier-Dobson farm. There is nowhere to stick with the included tape. So I machined a red oak base (yes, you read that right, CNC router red oak) to which the Telrad base attaches with 8-32 machine screws. (Yes, you can knock Red Oak, but I'll make it out of acetal now that the dimensions are right.) Once installed, it was trivial to line up the red circles with the finderscope and scope. This greatly facilitates the search for objects. Telrad to go to the right side of heaven; Finder to get more accurate information; Low magnification eyepiece in a telescope. Explosion! My only criticism is that it's a lot bigger than it should be. If you pop in AAA batteries, it's clear that this device can be made a few inches shorter and maybe an ounce or two lighter. There's a lot of unused space. I can buy them for my other two scopes which have regular tubes and should just be peel and stick.

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