RE: Wratten 87C

[Jason Revell <jason.revell@xxxxxxxxx>]

I am sure you will get more responses to this question but I use (but not
for much longer !) HSI in our photographic studio with a 87c.  With the
electronic flash I rate the film at 25 asa and Dev for 12 mins in neat XTol,
hope this helps.

I of course IF you have used this film with a different filter you can quite
easly work out your asa for the same Dev conditions;

Superimpose the spectral graph for the 'new' filter over the films and
measure it's area (only approx) and call this Value A
Superimpose the spectral graph for the 'old' filter over the films and
measure the area (again approx) and call this Value B
Old ASA rating is Value C.

New ASA = (A/B) * C          

Hope this helps

Jason Revell
University of Northumbria
> ----------
> From: 	Spearmint[SMTP:minty@xxxxxxxxxxxxx]
> Reply To: 	infrared@xxxxx
> Sent: 	Tuesday, May 16, 2000 1:34 AM
> To: 	Infrared
> Subject: 	Wratten 87C
> 
> Hullo!
> 
> Help!
> 
> Just remortgaged the house to buy a Wratten 87C filter, the question is . 
> . .
> 
> what ASA settings should I use for exposing HIE should I use??  The slip 
> of paper suggests 10ASA, anyone used this filter for HIE??
> 
> Thanks for any suggestions.
> 
> TTFN
> Gavin
> 
> 
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