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Digest submission

  • From: "David L DuPuy" <dupuy@xxxxxxxxxxxxxx>
  • Subject: Digest submission
  • Date: Sun, 18 Aug 1996 22:09:00 +0000
Sorry if I've missed this question... having just subscribed to this 
digest (which looks useful).

I'm debating whether to try a little 35mm vs. 120 IR (first time IR).  An 
appropriate filter is the next question.  So...

(a) does an 87, 87C, or 89 filter produce more of an IR effect than 
the conventional 25 filter?  I presume these filters have a slightly 
longer wavelength cutoff, admitting less of the orange wavelengths?

(b) I've found an 87 filter (Calumet) in 3x3 inch format, polyester, 
which I'm guessing could be used in a Cokin filter holder for a 
Hasselblad.  Anybody know of any reason this wouldn't work for a few 
trial IR rolls?  The price is right:  $12.50  :-)  

(c) Are exposures likely to be more tricky with these filters, 
compared to a #25?

Thanks,  David   (Lexington, VA)

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Topic No. 20