Re: hoya filter question

[Clive Warren <Clive.Warren@xxxxxxxxxxxxx>]

At 11:12 am -0500 11/4/00, phillip geller wrote:

>is the Hoya R72 the equivalent of an 88 or an 89b?
>The number would suggest that it is approximate equivalent
>of Heliopan RG 715.
>Can you observe the  Wood effect directly with it on a sunny day?
>Phil


Phil,

Have a look at the table in the Infrared FAQ in section 12 "Which Infrared
Filters".


The Hoya R72 is equivalent to an 89B.

The Heliopan RG715  is equivalent to an 88A.


Using an infrared camera you can observe the "wood effect" with both
filters. Slightly more so with the 88A.



All the best,

             Clive   http://www.cocam.co.uk
                     Photographic Services, Filters and Equipment, Infrared FAQ


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