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Originally Posted by Stu
That amount of scatching is not going to make any difference IMO. You would already be buying the scope type with the largest stray light anyway.
I can't find the review now but someone in the USA stuck a postage stamp on the front of an SCT and took heaps of images. Couldn't tell the difference with or without the stamp.
I think the C8 is a bargin and you still not have to stress about moving it OS because you will easily get your money back. I'd get it.
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Hi Stu, stray light indeed, you've been spoiled by apos haven't you
It doesn't suprise me that you could have a postage stamp on a corrector plate without much impact as it would be much like an aperture mask. Corrector plates can have a lot of crud on them without much noticeable impact I suspect because this mostly blocks rather than scatters light. Scratches on the other hand (and when I look at the images here all I can see are a mass of very fine scratches all over the plate with some larger ones that really stand out) I think are more likely to scatter the light and reduce contrast and sharpness more than anything that simply blocks light.
That aside I also feel it depends on what the intended use is. It might not have any noticable impact on low power deep sky imaging, however, high maginification planetary imaging is extremely demanding on optics, collimation, figures etc and when you're trying to extract that extra 5% from your scope scratches like these might make all the difference.
Asi - as Houghy suggested you could always make a low offer... or you could buy and sell something new, maybe even a C8 new if you want to save some moola and get the 9.25 in the states?
cheers,