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Yuri at TEC is making 250mm APOs at the moment. He also makes a 20 inch RC that Roland Christian thought was the best he'd ever used. Images from it looked good but it needs extra baffling or something minor to correct some odd flaring on bright stars.
Looking over images posted on the net though 20 inch RCOS images are at the very top in my opinion. Crawford, Croman, Gabany (yes even with the colour). The 20 inch RCOS boys.
Peter, shouldn't you update that request to take the Honders first?
Officina Stellare have a whole range of fast astrographs up to 20 inch and F5 or F3.8.
Agreed, a good refractor does make life easier.
Greg.
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