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Bojan,
The Rubinar's are well respected as being amongst the best there are. I also believe there is a rare Gem made by Questar, but have not really looked into this as it would be quiet expensive route. I am on the lookout for a used rubinar but with a shorter focal length. The one i lined seems a good low cost option which seems to have tested well for terestrial use. I wonder how it would perform for Astro use.
The other question that has to be asked is the value proposition compared to other low cost ED80 refractors. With such a small apperture on these mirror lens's one has to wonder how it would compare against the light gathering power of a non-obstructed ED telescope. I would like to see some direct comparrisons. I have the WO 80mm Triplet now and am looking to get a mirror lens to compare. A 500mm F5 would be nice to compare with.
Regards
Fahim
Regards
Fahim
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