Re: ISO for meter w/infrared

[Clive Warren <Clive.Warren@xxxxxxxxxxxxx>]

At 3:39 pm -0500 29/12/99, Charles Jay Pilzer wrote:

>I have been following this mail list for a while.  There have been several
>messages concerning how to meter for infrared film, but they confuse me
>because some ISO's are for through the lens meters with various filters in
>place. Others are for handheld meters though the a filter or without a
>filter.  It is not clear in some of messages what configuration is used for
>the ISO suggested.
>
>I am using a Hasselblad with has no built in meter.  I have a Sekonic L-508
>meter.  I would like to know what ISO to use on the meter for HIE when I
>have one of the following filters on the camera and no filter on the meter.
>
>1. no filter
>2. red 25
>3. B&W 090 (89B)
>4. 87
>5. 87B
>6. B&W 093 (87C)
>
>I appreciate any response to this message.
>
>Charles


Hello Charles,

There is a section on exposure in the Infrared FAQ on the CoCam site (URL
in sig. file). which will give you a guide. This can be transferred to your
preferred metering system.

Section 12. Exposing - Film Speeds and Rating for Filters

There really is no substitute for testing with your preferred film and
developing procedures.  I recommend shooting a roll of HIE bracketing
exposures up to +3 and -3 stops in 1 stop increments with the various
filters using the exposure information in the FAQ as a starting point
noting your meter readings.

You will then have an accurate way of calibrating your meter for use with HIE.





All the best,

             Clive   http://www.cocam.co.uk
                     Photographic Services, Filters and Equipment, Infrared FAQ
                            http://clive.bel-epa.com
                            Adventures in Cyberspace - Digital Art and Photos


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