Re: Exposure (was: Rangefinder etc)

[Willem-Jan Markerink <w.j.markerink@xxxxx>]

On 18 Jul 96 at 1:52, Vaughan Bromfield wrote:

> Kodak's data suggests ISO 80 for HIE. This refers to a hand-held meter, and
> assumes a red or ir filter is on the camera lens. That is, don't add any
> filter factor corrections to the ISO 80 reading!
> 
> For real-time SLR TTL metering, set the meter to 300 - 400 ISO with a red
> filter. Or set the camera to 80 ISO and set the shutter/aperture without a
> filter, then screw on the filter and expose.

My favorite way of explaining exposure is indeed starting with this 
400 ASA. Then adjust +3 stops for red, +4 for 87 and darker, and +5 
for 87C.
In the past several people have emailed me asking for the proper
setting for the darker colors 87B and 87A. Regrettably, Kodak has
skipped many of its IR colors (only 87 & 87C remaining I believe),
so I am currently involved in a (too) long project having this color
made in resin.

But I noticed from at least one bio that a 87B user is among 
us....perhaps you could tell us the typical exposure for this filter?
Would be very convenient if one could just add another stop, so +6 
for 87B, and +7 for 87A. But the curve of the film's sensitivity 
should tell me otherwise....it wouldn't surprise me if it is +8 and 
+10....

BTW, anyone numbers on Konica with darker filters than #25?
I once read that for practical purposes (read: not yet bulb setting) 
#89B was the darkest usable color; but I also read about using #87, 
ending up with fractions of ASA....;-))

 
--
Bye,

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The difference 
between men and boys
is the price of their toys

<w.j.markerink@xxxxx>
[note: 'a-one' & 'en-el'!]