[rollei_list] Re: Filters
- From: "Richard Knoppow" <dickburk@xxxxxxxxxxxxx>
- To: <rollei_list@xxxxxxxxxxxxx>
- Date: Wed, 27 Jul 2011 02:26:48 -0700
----- Original Message -----
From: "Robert Meier" <robertmeier@xxxxxxxxx>
To: <rollei_list@xxxxxxxxxxxxx>
Sent: Tuesday, July 26, 2011 9:46 PM
Subject: [rollei_list] Re: Filters
Richard,
According to that reading a -1 filter would require no
change in exposure. I believe -1, -2, and -3 on the
Rollei filters refer to stops. Carlos' exposure was
about 4 and 1/2 stops extra for the filter.
Robert
Well, I think you are right. Rollei evidently uses a
different system from Kodak and most other filter
manufacturers. A filter requiring a three stop increase in
exposure would be very dense. By Kodak terms it would be a
filter factor of 8, which is very high for a general purpose
filter.
--
Richard Knoppow
Los Angeles, CA, USA
dickburk@xxxxxxxxxxxxx
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