ISO for meter w/infrared

["Charles Jay Pilzer" <cjp@xxxxxxxxxx>]

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




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