[APML] IDAS filter used internally in Pentax 400 EDIF

[* <astrobound@yahoo.com>]

 I would like to ask if anyone has experience using an
IDAS filter in the internal filter slot of an ED
telephoto lens? As Jason points out there is a change
to the spectrum of light filtered through these
filters as the angle of incidence changes. My
assumption is that it should be ok in these lenses but
it would be great to get some feedback before ordering
one in 67mm. 

Thanks,

Keith

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