Comparatively the 10" will give you the best display, the next will be the 8" finally the 90SLT the last. Why is because of the aperture the bigger the aperture the more light is capture and directed to the eye.
The only advantage for the MAK is portability and goto if you decide to get the non goto DOB.
The focal length of the MAK is similar to the 10" so the 10" will way out perform the MAK in just about everything.
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