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Old Jul 10, 2004, 8:28 AM   #1
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I'm curious about a few details of adapter construction. The idea of using nylon screws just doesn't seem optimal to me. I would think they would tend to strip and with repeated usewould stillmark the paint on the eyepiece. What other sort of clamping methodscould beused? Thanks.

Let me add that I am zeroing in on an approach that seems appropiate. It involves a pre-installed ring at the base of the eyepiece along with an eyepiecetube. The ring is left on the eyepiece andprovides some form of keying with the tube that slips over it. The ring at the basematchesthe internal diameterof the tube and also provides the anti-rotation keying. The tube then has a diameter restriction at the top to fit snugly against the uppermost diameter of the eyepiece. Thus the tube is supported and centered at both ends. The means for mounting the camera is then constructed on the top of the tube. I am using PVC plumbing fittings and gluing them together to get what I need. I believe I will form the base ring from a steel band over a wrapping of rubber that provides an overall thickness to match the ID of the PVC tube.

Dave
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Old Jul 11, 2004, 12:49 AM   #2
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Hi Dave,

There are nearly as many designs for holding the camera in proximity to an eyepiece as there are adapters. The ones which work best in my opinion have set screws which press against rubber sleves backed with high impact plastic or carbon fiber which fit over the eyepiece barrel. You can find this type at EagleEye in the U.K. Also the ones sold by LCE (London Camera Exchange) work quite well.

The "best" solution in my experience is to use a dedicated eyepiece instead of clamping the camera onto one which has its exit pupil designed for the eye rather than for a lens. Insuch a case the eyepiece screws to the filter threads on the objective lens housing of the camera then mounts as any other 1.25" astro-type eyepiece on the scope. Of course if the scope doesn't accept this type eyepiece then a clamping type or bracket mount to the tripod mount must be used.

Best regards,



Lin
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Old Jul 11, 2004, 5:25 AM   #3
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Providing arubber sleeve seems much better than expecting to applynylon screws directly against the eyepiece.

Yes there is also the William Optics DCL-28 for 1.25" scope mounts.

http://www.william-optics.com/accessory/dcl28.htm
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