Re: Hoya R72 InfraRed filter

[pauck@xxxxxx (Marco Pauck)]

> Another question, in Hoya's catalougue, I saw 2 infrared filters, the 
> R72 & the M90. I'd suppose the M90 lets in less light than the R72. 
> Only question is, what exatcly is it supposed to let in & what is it 
> meant for ? 

The R72 cuts off at about 720nm and the RM90 at 900nm, hence their
names. The R72 is actually a very versatile filter that may be used
with Kodak HIE as well as Konica Infrared 750 and Inford SFX200 with
good results. I use it a lot. The RM90 is very 'strong' and usable for
Kodak HIE only.

Some additional info and links are on my filter page:

http://www.pauck.de/marco/photo/infrared/filter/filter.html

> Could it possibly be used for solar photography ?

Using infrared filters for solar photography is very dangerous because
they limit the visible light but not the infrared that 'carrys' the
heat possibly causing damages of your retina.

	Marco
-- 
Marco Pauck - WMD GmbH Hamburg, Germany - http://www.pauck.de/marco/
e-mail: marco@xxxxxxxx, phone: +49-40-58958-120, fax: +49-40-58958-199
For every complex problem, there is a solution that is simple, neat,
and wrong.  -- H. L. Mencken
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