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Home > Classifieds > Astromart Classifieds > Telescope - Reflectors > Classified #257899

For Sale: 13.1" F4.5 Collapsible Truss Tube DOB *SALE PENDING*

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Time to sell one of my favorite projects of all times. Fully collapsed, the OTA is 38" tall. Loosening each of the 4 corner clamps 1/2 turn lets the scope extend to the viewing position with an eyepiece height of 60". Positive stops assure repeatable positioning each time and minimal, if any, collimation is required. The OTA, complete, weighs in at 44 pounds. The rocker box is 17.

The altitude trunions are large at 15" in diameter and are covered on the front surface with black, high pressure laminate. The outer rims are covered with Velcro brand industrial strength velcro, as is used on StarMaster telescopes. The altitude bearings are made from virgin teflon. The azimuth bearings and surface are made from the same materials as StarMaster telescopes.

The mirror box is 1/2" cabinet grade birch plywood with solid walnut corner pieces. The mirror sits on a 6 point floating cell and is retained by three, loosely attached strips of velcro on the mirror sides.

The mirror was purchased from Rotorwave, Inc., in Katy, Texas where it was used in holography. It has excellent coatings with no scratches or sleeks, and produces sharp images. The secondary mirror is 2.6", also with excellent, unblemished coatings.

The secondary cage is made from 1/8" thick strips of birch and walnut glued into a 3/1 repeating pattern. The inside diameter is 15 3/8" diameter and it's a little over 12" high. The 2" Crayford style focuser is of my own design and has 1 5/8" of travel. The focuser shaft is 3/16" in diamter, is mounted in ball bearings, and combined with the 2" knobs, provides smooth action and fine adjustment.

I know it's unheard of, but if you had to have just one scope, this could be the one. Plenty of aperature for the deep, fuzzies and still portable enough to haul around. My price is $1,500, shipped UPS anywhere in the continental US.

Thanks for looking...
Chuck Fellows
 

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