Re: Konica IR film

[George L Smyth <GLSmyth@xxxxxxx>]

Willem-Jan Markerink wrote:
> 
> On 13 Nov 96 at 13:26, George L Smyth wrote:
> 
> > No.  Very simply, place your in-camera meter at 10 and place the filter
> > over the lens.  Metering through the lens, shoot at the indicated
> > aperture/speed.  My #25 filter loses 2 stops, which corresponds roughly
> > to Konica's suggestion (EI32 - stops = EI8).
> 
> Ahum, make that EI 32 for a TTF (through the filter) metering, or EI
> 8-10 for a NTTF metering.
> EI 8 and TTF makes EI 1 (one)....;-))

Actually, my answer was a bit misleading.  I do shoot Konica at EI10
with TTF metering, and as I normally use the 120 version which means the
use of a roll back for my 4X5 and a separate meter, I place the #25
filter over the meter to get my values, then place it over the lens.  

This means that that no stop conversions need be made.  When I first
started using this film I shot it at EI32 and got crummy results.  I was
thinking of ditching the film but decided to figure out what the problem
was.  In a moment of fortunate mistakenness I thought that I needed to
change the EI to compensate for the filter (no need - I was using the
same filter to meter as went over the lens).  I shot the film at EI8 and
cut back on the development.  The results were wonderful.  As I needed
to print on 1 1/2 grade paper I moved up slightly to EI10, where I
generally tend to stay.

I know that other people shoot this film faster than I, and to them I
say "fine," but it doesn't work for me.  Of course, we're all looking
for our own results, so I say to choose something, then adjust until it
works for you.  We can probably all agree on that.

Cheers -

george

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

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Topic No. 9