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Home > Classifieds > Astromart Classifieds > Telescope Making > Classified #222110

Sale/Trade: Tasco/Vixen 8V Carcass

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For the hardcore ATM experimenter -- a Tasco-Vixen 8V OTA, complete with all optics but lacking the original Vixen focuser and finder.

The 8V is a 5" "short" Newtonian design, using a large, two-element negative lens in front of the secondary mirror to correct (more or less) the SA of the spherical f/3.3 primary and to lenghten the overall focal length to 1000 mm. The secondary and corrector are stalk mounted on an optical window at the front of the telescope (see photo). These instruments were made by Vixen and imported by Tasco in the early 1980s mated to the original Polaris mount.

In my experience, I have never seen one of these that gave very good images, but I am not sure if the fault lies in the correcting lens itself or in the spacing of the optical elements. At any rate, this one comes with everything except the original R&P focuser and the 6 x 30 finder. Note that the tube has been dinged in several places, but I have mostly gotten these out, and it would be OK with a bit more filling, sanding, and priming. (Also includes a slip-on dew cap/light shield.)

Because of its construction, this scope has the potential to be converted into several different instruments, including a very fast, closed Newtonian (as I have done with another of these units that I had) or a Schmidt Newtonian, if one figures the optical window. Or, with a bit of jiggering, perhaps one might work out the optimal spacing of the optical elements and/or figure the spherical primary to null out any residual SA that is present in the system.

Anyway, this unit has definitely become a "surplus" item around here, and it is time to find it another home! I'm looking for a cash offer of anything over about $25.00, or will swap for something that I need such as, say, a decent 1.25" star diagonal or a 45 degree erect image unit.

Thanks --


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