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Re: [APML] IDAS filter used internally in Pentax 400 EDIF

Hi,

Using the filter in an F4 optics should be fine.
The opening angle of an F4 beam is 14 degree, well within
the safe range of that filter.  Even an F2.8 optics will not
cause problems.

Cheers,

Wei-Hao

-- 
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Wei-Hao Wang  :)

Institute for Astronomy at University of Hawaii

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2680 Woodlawn Drive         Personal Website:
Honolulu, HI 96822             http://www.ifa.hawaii.edu/~wang
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