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Originally Posted by Slawomir
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The APM 105 sounds good but appears overpriced. APO 102-107mm air spaced triplets are plentiful on the market these days and Stellarvue has them >.95 strehl for a lot less.
APO triplets used to be a rare thing now they seem plentiful. I imagine quality could possibly vary so getting one of these from a reputable telescope maker that provides an interferometric test report would ease that concern.
The other weak spot would be focusers. Stellarvue probably has a good focuser and they also offer a 3 inch Feathertouch upgrade which probably would be a smart move. In my experience you need at least a 3 inch focuser to use a full frame or larger sensor.
Has anyone any experience with carbon fibre APO scopes? I know Roland Christen of AP is against them due to internal air currents but I see a few makers using them - Stellarvue and Officina Stellare.
I think I would stick to an aluminium tube unless there are some nice advantages to carbon fibre. The main advantage appears to be its lighter and looks good.
The more you look into this area of telescopes the more the FSQ106 seems the standout for imaging at least. Most seem to have a smallish corrected circle.
Greg