I will post some results today.
What I noticed this morning is the discrepancy in metering between the two lenses. The aperture dial in each lens rotates without any clicks, so you need to set the white line in front of the chosen aperture marks. The ring rotates from right of 2.0 to left of 16.0 on the 45mm lens. I was not sure where exactly was "2.8".
Since the M6 and the Bessa T have been nearly identical in metering, I was thrown off by seeing the T showing f 11 @ 250 as the "right" exposure while the M6 showed me f 11 @ 500 as the right exposure. At first, I attributed this difference to the fact that the T had the 28mm lens while the M6 had the 45mm lens. Even then, it should/could have been the other way around since the 28mm coverage is wider, and it could be that the meter in the T would pick up more light in the edges, but what I saw in exposures was the opposite.
An hour later, while at a coffee shop, I sat beside a wall that was evenly lit from the window. After a few sips of coffee and eating a bagel with sun dried tomato spread, I cleaned my hands and I opened the camera bag up to check the meters in the T and the M6. In order to get at the little problem, I mounted both lenses sequentially on the Bessa T and I set in both cases the aperture white mark to the "2" of 2.8 on the aperture scale. I placed the lens very close to the wall so that an evenly lit part of the wall was covered by the lenses. The meter showed different results. A "2.8" on one lens was not exactly "2.8" on the other lens.
It could be that when using automatic exposure, you don't have to worry about getting 2.4 or 2.8 or 3.2 since the exposure will be "correct" with aperture priority. Did Ken use aperture priority or manual exposure?
While taking photos this morning, for the two cameras to agree on metering, one lens had to be set at the right of 2.8 and one lens was set on the "8" of 2.8.
I don't know whether Dirk can give us some clarifications on this minor issue for manual exposure camera users who may want to use transparency film with suchlenses. With such type of film, small differences in exposure can make a difference between "perfect" and "slightly imperfect" exposures. I used print film, so I doubt it that we will see any difference in exposure between the two camera.
I can see that having such lenses is very useful for travel. The lenses are relatively small and light, and they are optically superb based on many reports.
