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Well astrophotography is the popular theme of astronomy today, so that is why fast APO's are popular. The Megrez was never a good choice for AP or visual, and I am pleased I avoided buying one years ago and bought a Sharpstar 106 instead.
Your 152/1200 will only beat my 132 CFF on deep sky, double stars and planets will show much better in the CFF.
The only advantage I see in long focal length refractors is their depth of focus.
Modern focusers make this unimportant.
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