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Old 28-10-2009, 07:37 PM
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Bassnut (Fred)
Narrowfield rules!

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Join Date: Nov 2006
Location: Torquay
Posts: 5,065
Thanks Guy and Marc. Both links are fairly heavy going, but I suspect Ill have to wade through them. The 1st seems to relate to close focus, and the 2nd mentions "Critical distance" between primary and secondary, which doesnt sound good at all. Its a shame Meade just doesnt specify optimum BDF without needing to do all the math to work it out for yourself.
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