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Hi Fred
I'm having the same thoughts regarding the QHY9. I'm very interested in getting one but not too keen on shelling out loads on 2 inch filters when I already have plenty of 1.25".
I could get my ATIK filter wheel very close to the camera. I realise that vignetting is going to happen at fast focal ratios but has anyone got any idea how fast it is likely to be before it becomes a real problem? I tend to image between f6 and f11. I don't mind shaving some off but obviously I wouldn't want to loose to much field of view.
Thanks
Steve
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