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Just had a look at GSO's web site... the coma corrector they show is of the same mechanical construction as the one on Andrew's web page. If I was to take a guess, I would say it is an old Ross style corrector.
One criticism I think needs to be fairly levelled at GSO is the lack of specs on this product. Things like; how much in focus does it require, how far is the focal plane shifted from the native focus? Spot diagrams or at least some indication of field correction and maybe vignetting curves wouldn't go astray either?
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