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Home > Classifieds > Astromart Classifieds > Telescope - Refractor > Classified #153085

For Sale: Brandon 80mm f/4 APO, modified for guiding [sale pending]

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This is a rarely-seen member of the Brandon family: an f/4 achromat (don't let that APO name fool you; it's a classic achromat).

Optics are in excellent condition and are really good for an f/4 achromat. Scope is pristine and clean, but it has been modified to make it function extremely well as a guider. See details below.

Includes:

* Scope
* Front dust cover
* Back dust cover
* Locking screws
* Losmandy 90mm rings with DA plates

This scope has been modified to make every part of it absolutely rigid for guiding. On a steady night, guide corrections have been measured as low as 0.06 arcsec RMS (0.15 arcsec average). It is very, very solid and makes a superb guide scope for an STV or ST-237 (or any other camera with small pixels).

Modifications:
---------------------------------------------------------------
* Drilled and tapped three 6x32 holes for set screws that hold the focuser tube absolutely rigidly.
* Drilled and tapped three 6x32 holes for socket-head screws that hold the camera absolutely rigidly.
* Added Losmandy 90mm rings and DA plates. Clamps directly to any male Losmandy dovetail.

Email me for a photo of the objective, which is in very pristine condition. I have the original box. Scope and rings sold as a set, asking $400 OBO.
 

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