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Old 15-03-2014, 10:53 AM
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LewisM
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Further flattening req'd?

I have been measuring through CCDInspector a complete series of FITS I recently took of NGC2467. This was using my Vixen FL102S using the dedicated Vixen FR, which reduces it to f/6.4.

The mean field curvature (compared over 20 subs) is consistently 7.0% - it's not FLAT, but pretty close.

That's acceptably flat to me, but is it worthwhile chasing the tail and getting it flatter? Anyone know of a decent FR/flattener that not only is moderately reductive (as opposed to the usual 0.8 like the Televue etc, which only bring my scope back to f/7.2) but flattening also?
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Old 19-03-2014, 02:26 PM
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LewisM
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Doesn't mattr (not that I got any replies ) cause the scope is gone, making way for the FSQ106EDXIII
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