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Re: IR Filter

  • From: George L Smyth <GLSmyth@xxxxxxx>
  • Subject: Re: IR Filter
  • Date: Thu, 18 Jul 1996 22:43:54 +0200
Russell J Rosener wrote:
> 
> I just recently purchased a Hoya R72 infra red filter. I thought it was
> able to pass some visible light for focusing, but it seems virtually
> opaque to visible light. Is there a Hoya filter which is even more opaque?
> Would that be the R70? There no useful information on the filter factor
> packed with this thing. What would be a filter factor guideline?
> Has anyone used this filter with Konica IR?
> 

As mentioned in an earlier comment, I've shot Konica with the Hoya R72
and found it to need about three stops of exposure (#25 filter needs two
stops).  I've used it mostly with 4X5 Kodak IR pinhole, which takes a
bit of getting used to.

george

-- 
 Handmade Photographic Images     
  http://www2.ari.net/glsmyth