[rollei_list] Re: An ebay explanation
- From: "Jeff Kelley" <thocker@xxxxxxxxxxx>
- To: rollei_list@xxxxxxxxxxxxx
- Date: Mon, 19 Mar 2007 09:25:43 -0700
http://www.westonmaster.com
The above link has more info than you'll probably want to know about the
Weston meters.
I have a Weston III circa 1956 that tests OK according to the methods on
that site and it matches the readings I get from a DSLR as well.
These meters are small and work fine in most situations...plus you never
have to worry about a battery running down.
Richard, the Weston III I have does not seem to have to be corrected nearly
as much as you suggest. The guy on the site linked above, in fact, states
that with modern films, you can pretty much ignore the old advice about
correcting for the way the Weston reads light vs. today's meters.
I've found it true with the Weston III I own, but have no experience with
any other Weston meters.
Jeff
I checked this again. The Weston speeds should be about 80% of ISO
speeds, i.e., set the meter for Weston 80 for the equivalent of ISO-100.
However, when comparing the exposure indicated to ISO meters I found that
this speed is high and Weston 64 is more nearly correct. I am not sure why.
I get the same thing if I set the meter for 80 and use the "C" pointer for
the reading. Older Weston meters had five indicators on the calculator, U
for underexposure, A for shadows, just the pointer for the middle, C for
highlights with detail and O for overexposure. Color transparencies were
supposed to fit into the A to C range, about 2 stops.
I don't remember the details of how Weston measured speed but I think I
have an old text which explains it. The Weston speed system was one of the
first to be designed for practical photography rather than emulsion
research. In addition, Weston made all the measurements, so there was no
temptation for film makers to exagerate the speed of their products. I will
have to find details of the system to see if there was some sort of fudge
factor there.
The Weston meter has a very large acceptance angle so one must be
careful of skylight when making measurements. A good comparison can be done
using a large white card, say a matte board, and comparing the meter with
one set up for ISO speeds. I will do this again later today and report on
what I find.
I am just back from work and a litte fried so more later.
---
Richard Knoppow
Los Angeles, CA, USA
dickburk@xxxxxxxxxxxxx
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