Re: Filter/Speed/Meter

["phillip geller" <filje@xxxxxxxxxxx>]

----- Original Message -----
From: "R. C. Lacovara" <lacovara@xxxxxxxxxxx>
To: <infrared@xxxxx>
Sent: Monday, October 02, 2000 10:03 AM


> I have tried a Hoya R72 over my Weston III and IV, but despite several
> sources' claims that these meters are IR sensitive, this is hard to see.
> I'm trying to rig a better filter mount for one of my Westons.

for MACO use an incident meter set around an ei of 12 with an 89b.for the
R 72 / perhaps 8.

Does a weston meter have a selenium cell?
Just did some tests with a selenium cell meter
To meter through an 89b it needs to be set at ei 640
For an R72 it is 1200 to get an equivalent exposure for an ei of 12

I have found that a CDS cell is a lot more sensitive and can be set at only
200 to
give an equivalent reading. An sbc cell with the green ir blocking filter
has to be set at 600.


PHIL
phillip geller photography
http://pages.prodigy.net/filje







> Thanks,
>
> Bob


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