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I might add I have read Roland Christen say an APO doublet with triplet like correction was possible to make. I am not sure if he ever made one but all AP scopes seem to be oiled triplets with the 160 being an airspaced triplet and the 130GTX having one air spaced element in its triplet.
But no APO doublets from AP. Even if you could make a superb doublet it would be pushing it uphill marketing-wise to get it accepted as good and not just hype. Especially at the prices its likely to be sold at.
I have briefly read some reviews about the APM 140mm doublet. APM now sell a 152 doublet same setup, for the same price as the 140!
There is so much choice these days in the telescope market, particularly the APO market. Its hard to get past all the marketing hype and rebranding to see if the scope would be OK or not.
Best again to resort to owners' reviews and inspect images from these scopes. Hard to lie then.
Greg.
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