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Re: ATM Focal Length Checking




>I warmly :-) agree! I was refining the measure for my 20" f/4.

Well, you have a 20" mirror, when I have a 6", and also your focal ratio 
is very fast (not like my mirror, which is 6" f/8).

When I pointed my mirror to a page when the sun's light was focused, not 
even smoke came out. Now, you got smoke from a CHAIR!!!

Thanks, Asaf.

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