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[ATM] re; secondary dillemma
Thanks to those who have responded so far. I also have available a 70mm
(2.76'') secondary which would give the figures:
75% illuminated edge of field, 0.14 degrees/4.94mm 100%illuminated field
(out of total of 1 degree/37.24), with a central obstruction of 17.22%. This
is the only diagonal available without having to order one from the US.
Again, I would have to somehow modify the 2.6 ''holder as this secondary is
a non-standard size.
Tim Nott (Australia)
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