Greg,
Oops !
Thanks - Yes, you're correct, its about 0.3mm thats a bit bigger !
300 microns is going to put most scopes out of their CFZ !
Messed up my microns to mm instead of m conversion !
There is still a need for paper sometimes - it leaves a nice audit trail of your mental process that a PC calculator doesnt !
However I think that with focussing between subs or filter changes this should be the least of the GSO problems.
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