[pure-silver] Re: Metering 135 vs 120
----- Original Message ----- From: <eroustom@xxxxxxxxxxx> 
To: <pure-silver@xxxxxxxxxxxxx>
Sent: Tuesday, August 26, 2008 3:14 PM
Subject: [pure-silver] Metering 135 vs 120
> There is for me. I'm assuming it's a difference in > metering. My 35s
have built in meters while I use a Minolta IVF for the mf. The exposures seem to be very different so I always have to add developing time for my 120 film. I shoot TMax (finishing off some 
old film) and TriX.
That's an interesting problem. Why not chase down the metering issue, and leave a variable out of processing?
Your minolta is an ambient light meter (I think), and your camera's TTL meter is an incident meter?
I've noticed some situations that have given me readings two stops off from each other when using my handheld meter against the TTL in my Canon bodies. But I assume it's how I'm using the meter(s), so I work to find the same reading, or try to reason out why that's happening. Sometimes the lens (I use a 24, a 35, a 50, or 100) brings in less or more light to the TTL meter at the back - or so it seems - or they average differently, whereas the handheld meter has no lens in front of it.
But an exposure value for Zone V, or 18% gray, for a a given ISO should be the same from meter to meter, no? 

Can anyone more experienced chime in on this?

Elias
Some meters seem to be calibrated for 12% mid gray. In general, however, a reflected light meter should read the same from an evenly illuminated 18% gray card that fills its field of view as an incident light meter reading the illumination. There are some variations on this, for instance, my ancient Weston Master II does not agree with either my Luna Pro or with a Sekonic Studio Deluxe (Norwood pattern) meter. This is with the correct equivalent Weston speed set. I've come to the conclusion that either Weston included a fudge factor in its speeds or that the calculator is set up for some other reflectance for the pointer value than 18%. In any case, I get the identical readings when the Weston speed is set for about half of the speed translated from ISO speeds. I have a second Weston meter of a different type which shares this characteristic. My old GE meter agrees with the two more modern meters. To be clear, the Luna Pro and Sekonic agree exactly for both incident and reflected light. 

---
Richard Knoppow
Los Angeles, CA, USA
dickburk@xxxxxxxxxxxxx 
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