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I tend to agree with Clive, a big APO is pretty hard to beat.
Given my home is prone to bushfire threats, and I'm often away from home, and despite everything being insured, I've asked the family to grab my AP refractors if we have to be evacuated...as they would be very difficult to replace.
The AP155 with the 4" field flattener is a superb imaging/solar/visual instrument. Sure, I've used bigger/wider/shorter 'scopes...but none more beautifully finished or corrected.
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