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I can’t really complain too much. I am using an OTA photographically which was not built specifically for that purpose and that I have used as a visual instrument for a good long time first.
The issue is that the Edge HD tubes show that it IS possible to correct them nicely. Unless of course they are really an F15 or similar OTA with inbuilt reducer/corrector and not just correcting them at F10 for a flat field wothout reduction.
Even then I suppose they would be unlikely to want to produce an equivalent flattener for the standard scopes for a couple of hundred dollars when they can sell me an Edge HD instead for probably a lot better margin.
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