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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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