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Old 14-11-2013, 05:09 PM
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alpal is offline
Join Date: Jan 2012
Location: Melbourne
Posts: 2,932
Originally Posted by Bassnut View Post
Yes, a flattener would give better images but it's VERY expensive.

Focusing every 2 weeks is just lazy, but it doesn't make much difference, and with megadata, decon/sharpening makes small changes irrelavent anyway.

RCOS RCs are over engineered and expensive, that's why they went broke (I got mine S/H). Holding focus that well is uneccessary and not required for the amature market.

I suppose too that at long f ratios focus is less of a problem.
I believe that bad seeing actually takes the target in & out of focus anyway.

Pity that RCOS went down - some telescope versions had ion milled mirrors.
I suppose you'd need sub arc second seeing for it to make any difference?
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