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11x50mm white tube finder with a story For Sale

Price - $20.00

Ad Number: 114577

Posted: 02 Sep 2017

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This came off a Photon Instruments refractor. This was never a very satisfactory finder because the eyepiece, to focus right, always felt like it was going to have to be unscrewed far enough to fall off the threads. A few years after I bought it, the crosshairs in the eyepiece broke. I replaced them with the very finest thread I could find, reassembled it, and discovered how really find a finderscope's crosshairs are by comparison.

A rational person would have thrown it away, but my lathe and me like challenges. So I tried to find a replacement crosshair eyepiece with the right threads: no luck. So I machined an adapter from acetal that would screw onto the back of the tube and accept a .965" crosshair eyepiece. Telescope Warehouse had one in 18mm F.L. for $12. Thus, you have an 11x50mm finder, which is less than ideal for a finder, but it's cheap. The eyepiece is held at the focal point by a thumbscrew allowing some room for focus adjustment. You might even find a .965" 25mm F.L. crosshair eyepiece somewhere to return it to 8x50. The tube is 54mm OD and includes an cap. This will fit into rings 5" apart.

It focuses decently, but make no mistake about it, this is Chinese-made and does not even begin to compare to the optics of the University Optics 8x50mm (now 11x50mm with similar eyepiece and machining efforts), but for a cheap finder, it's a bargain.

Add $10 for Priority Mail delivery in the U.S.

General


  • Condition used
  • Location Horseshoe Bend, ID



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