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[ATM] [atm] secondary mirror of gregorian
Dear sirs,
in testing procedure of secondary mirror , if i put a LED light with a thin slit as light source , at the shortest focal point instead of ( puting a polished steel ball for reflecting the light from the electric bulb located out of the range of sight ) .., is it better or i have to put only the steel ball.....please guide me .
meantime i will be grateful to communicate to someone who has experienced making this type of telescope ......please let me get aquainted with them....
faithfully yours,
s.m.ghasemi
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