"[EMAIL PROTECTED]" wrote:
>I'm curious to attempt pushing the film (whether it's 3200 or not - i.e. I
was going
>to attempt 400 pushed to 3200) and I noted that both these films can
potentially go,
>according to literature, to 25,000 EI.
>How the H-E-double hockey sticks do you meter that ? My Sekonic L308-B
can only go
>to 8000. Every other hand meter I've seen only goes so high so how do you
compensate
>for ISO above 8000 ? (i.e. 12,500 and higher)
This one's easy :-) You meter at what you can and use math to go from that
exposure index to the one needed for the film you actually have.
For example, If you could only meter at 100ISO, but were shooting 400ISO
film, you'd alter the indicated exposure by two full stops (100 -> 200 ->
400 ==> 1 stop + 1 stop).
Using your example of 8000 to 12,500, you'd take the indicated exposure at
8000 ISO and decrease it by slightly more than 1/2 stop. (8000 -> 16000
would be a full stop, 8000 -> 12000 is half a stop). Using your other
example of 8000 -> 25000 (8000 -> 16000 -> 24000 ==> 1 stop + .5 stop) means
you'll need to decrease the indicated exposure by a tad more than 1.5 stops.
There is a way to figure it exactly using math and a calculator, but 1/2
stop resolution should be sufficient as most cameras won't allow you to set
exposure at anything finer than that.
hope that helps,
patbob
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