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Old 20-05-2018, 07:14 PM
Stefan Buda
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Stefan Buda is offline
 
Join Date: Jul 2013
Location: Melbourne, VIC
Posts: 547
There are very good reasons for not building large Gregorian telescopes - that's why nobody does, I guess.
One of the biggest reasons is that they are so much bigger than an equivalent aperture common Cassegrain, with all the resulting extra difficulties.
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