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Showing results for tags '82 degree'.
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This Speers WALER 10mm eyepiece is in excellent condition, with both caps and the original box. It has an 82 degree afov and offer views which have been compared with Televue Naglers. Optically it is in basically perfect condition, there are one or two marks on the barrel. Looking for £55 plus £2.50 P&P via PayPal fees paid or bank transfer. As with the other items, will go on ABS at the weekend. Thanks, Stu
Hi all , The visitor from outer space was Seth the nephew , 5 and I got a shot of him beside the 200P ... The second shot is from a new lens that arrived today ES 8.8mm 82 degree beside 3 kit lenses of similar focal length for scale .
I am the happy owner of an ES 82 degree 18 mm eyepiece that I use together with a Baader MPCC coma corrector on my SW 200 mm f/5 Newtonian. Until now I have been using the CC directly attached to the filter thread of the eyepiece, which I know is not correct. I now wish to buy the corresponding spacers so to be able to use the optical system correctly, but this is seemingly more difficult than I first supposed. According to the CC specifications, the distance between the flat surface and the focal plane (camera or eyepiece) should be 55 mm. I have verified this when using the CC photographically and that worked fine. If one removes the T-2 adapter and uses the M48 thread instead, as I do for use with the eyepiece, this distance becomes 57.5 mm. Thanks to this table in a post in Cloudy Nights I was able to figure out that I need a spacing of 32.5 mm between the coma corrector and the eyepiece. The post includes some references to spacers, but aside from the Baader ones (28 and 14 mm, see here) I am having trouble to find suitable spacers in European retailers that would add up to 32.5 mm. This is why I would like to ask you for help. Has anyone solved this problem before? If so, how? Where can I buy spacers suitable for adding 4.5 mm optical path to a system with 2", M48 threads? Thanks in advance and clear skies!