cokin filters

[Jaap Los <losjb@xxxxxxxxxxxxxx>]

Subject: Cokin filters

Hi, all!

Im going to be crazy on IR and HIE. The more crazy I get the more
questions I have. Here are some:

I use B+W 092 filter (similar to Wratten 89B). As I have only one such
filter and use various lenses (no zoom!) I have to screw on and off
every time. Moreover the filter is so dark, that I can not compose the
picture through my reflex viewfinder. So this also means screwing on and
off. I therefore want to use my Cokin filter holder A or P type. I have
such a holder and adaptor on every lens. I simply have to slide the
square type filter in and out.

My question is:  as far as I know Cokin has no filter similar to 092 or
89B  to fit their holders. Is there an other maker of square type
filters 092/89b/similar that fit the Cokin holders? 

My second question is:  Can I use Cokin red filter nr. 003 for Hie?  Are
the results reasonable?  Which wavelengths (in Nanometers)  are blocked
by Cokin 003 red filter?  B+W092 blocks all wavelengths below appr. 695
Nanometers.

Thanks for your help!

Jaap los
Holland
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