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Hi All,
I think Lee,
Hit the nail right on the head,they have a fairly small focal ratio,I think.
Although,the Triplet configuration,I would have thought, would correct for this.
Maybe,one cancells out the other,
I am far from an expert,
Perhaps John,(Ausastronomer),if he reads this thread will have the answer.
I have the 20x 80 LW's,and extremly little CA is seen,it's there allright,but minimal.
Just the Barrels on these are 280mm,or 11 inches long,so I would imagine the f/r is reasonable.
Regards.
John
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