[pure-silver] Re: estimating filter factor: gray card?
- From: Camclicker@xxxxxxx
- To: pure-silver@xxxxxxxxxxxxx
- Date: Sat, 30 Sep 2006 13:43:04 EDT
In a message dated 9/30/2006 1:17:28 P.M. Eastern Daylight Time,
bobkiss@xxxxxxxxxxxxx writes:
DEAR BRUCE,
He is not implying a relationship between filter and film speed, he is
stating how to adjust your meter to take the filter factor into account. This
way
you donât have to do your readings first and THEN either divide the shutter
speed by the factor or convert the factor to stops and then adjust your
aperture. It is just simpler to divide your film speed by the filter factor
and
put this number into your meter.
Oh, I see. Nick is saying by adjusting the meter ISO to conform with the X
factor you do not need to adjust for each exposure.
So, a film ISO of 100 divided by 5 X factor becomes an ISO of 20. You simply
use 20 as your metering ISO. That makes sense.
Thanks Bob,
Bruce Osgood
Camclicker @ aol.com
Brooklyn, NY.
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