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The 2" 0.73x Keller corrector is 760 Euros... around $1080AU before postage and import taxes last time I did the conversion..
As far as quality is concerned, it would not be as fast as the C8 + Hyperstar. The field of view would not be as wide, however the overall sharpness would probably be better. it would be easier to setup, less fragile,The field would be very flat provided you adhered to the correct back focus distance of the keller corrector..
You would have a much more uniform diffraction pattern from the newt, with an SCT and hyperstar, you have an oddly shaped camera and cables in the optical path creating very strange diffraction patterns.
Contrast in the newt would be better as well, being that the central obstruction would be incredibly low in comparison.
I would want to put a bigger secondary in the newt with that corrector, to make sure it gets the most illumination as possible.
Cost wise, the C8+HS3 is the better option... Overall image quality, I think the newt is the better option of the two...
I myself am considering getting an 8" F/4 OTA and a keller corrector to make it 8" F/2.95.. Extremely fast, narrowband imaging scope..
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