Quote:
Originally Posted by mldee
I'm also a little surprised that someone hasn't yet come up with some really creative air cooling systems for closed-tube OTA's to offset that problem.
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They have. Roland Christen of Astrophysics produced a very small number of 10"/F14.6 Maksutov Cassegrains about 8 years ago. These were outstanding telescopes incorporating a specially designed rear cell with special cooling fans and exhausts, to aid cooling. At US $10K or US $1K per inch of aperture, they weren't cheap.
Cheers,
John B