Quote:
Originally Posted by Wavytone
I'll suggest these are only suitable as ornaments for a lounge or shop now - they are way past their use-by date. No value as museum pieces as they aren't historically significant, nor are they collectible - unlike a Questar.
The mirror coatings will have oxidised by now, the tube is questionable and the rest thoroughly outdated.
And that's before getting to the topic of optical quality. I had a look through two in the early 1980's and they were not a match for an orange C8 that I had at the time. Secondly the ones I saw had corrector plates without antireflection coatings, so there goes 15-20% of the light for starters.
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Spot on. They don't even come close to the old C8's or the various Meade offerings. The later Bushnell ones are apparently even worse! Having sheet-canned the Dynamax 8, the 6" was apparently fine, as were their Newtonians.
Here is a "glowing" article on them:
https://www.cloudynights.com/article...elescope-r2073
There are literally hundreds of other hate threads about them too.
A short history on Criterion:
http://www.lpl.arizona.edu/~rhill/DY...riterion.html/
Seems Cris may have owned the only good one in existence.