Oops, you're right: the 87C is a much deeper filter.
The IR season is just beginning here; my excuse is rustiness. :-)
Andrew
on 2004/05/10 7:12 AM, Klaus Elmquist Nielsen at klaus.elmquist@xxxxxxxxxx
wrote:
>> Date: Sun, 09 May 2004 10:16:58 -0400
>> From: Andrew Gullen <andrew.gullen@xxxxxxxxxxxx>
>>
>> ... I've tested with an 092, while the R72 is an 87C, right?) ...
>
> The Hoya R72 is an 89B, as far as I know:
>
> http://www.cocam.co.uk/CoCamWS/Infrared/INFRARED.HTM#FIL
>
> Scroll down slightly to see the table. What surprises me is that B+W 092
> and Hoya R72 is the same type of filter.
>
> Anyone that can comment on quality of Heliopan filters, btw?
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