Re: Infared Exposure???

[Geoff McAuliffe <mcauliff@xxxxxxxxx>]

Sherri Sparks wrote:

> I am fairly new to infared photography and was wondering if anyone
> could offer me some advice.  I am familiar with the basies (ie. keep
> refrigerated, develop immediately after exposure, use a red filter...)
> but I would greatly appreciate some more detailed information on
> exposure. I am using Kodak high speed infared. I have been bracketing
> based upon a reflected meter measurement and have found a consistent
> need for underexposure since my negatives have typically been quite
> dense. In clear sunlight, it appears that a 1&1/2 to 2 stop
> underexposure is necessary.  I have not tested further and have been
> unable to find any more information.  Is there any way to specifically
> test or calculate infared levels?? If there is not also does anyone
> have any general exposure guidelines that would be helpful?
>
> Thanks,
> Sherri
>

Sherri:

     For 35 mm Kodak IR I always get good results with f11, 1/125 with a
red (25) filter on a bright, sunny day. I bracket + or - one stop but
rarely print those negs. I never use a meter, the relationship of IR to
visible is quite variable with time of day, season, latitude and I am
easily confused. Someone on the list recommended opening up one stop for
every two stops of visible light falloff on non-bright sun days.
    Do you have Laurie White's book?  Highly recommended.

Good luck,
Geoff
--
**********************************************
Geoff McAuliffe, Ph.D.
Neuroscience and Cell Biology
Robert Wood Johnson Medical School
675 Hoes Lane, Piscataway, NJ 08854
voice: (732)-235-4583; fax: -4029
mcauliff@xxxxxxxxx
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