I had a short meet with my friend, as he wanted to check out whether there's something wrong with his E-P1 and Leica 25mm F1.4 lens. There seemed to be some noises coming out of the lens arbitrarily.
After a short check, I confirmed his observation that the lens when attached to the E-P1 or E-P2 via the MMF-1 adapter, will automatically stop down to a smaller aperture. Why this happened? We didn't know actually. Though we theorized that the LCD would be overexposed if the lens did not stop down. I was estimating at about F2.8-4, as the iris automatically changed constantly everytime the camera detected changes in scene exposures. The thing was during composition, the aperture was stopped down; once the shutter button was pressed the aperture would change to the desired setting. In the case of F1.4, the iris opened up.
Another point was that everytime the iris changed size, there would be a soft mechanical sound of the blades moving. This could be a nuisance during video shooting.
Focusing with such a shallow depth-of-field was tough as focus lock was a bit dodgy as the CDAF was not really accurate. Why? This was simply because the AF area point was larger than the DoF the lens was getting!
So, will Olympus come up with a firmware upgrade to fix this? Or was it a mechanical problem that require more than just a simple download? Only time will tell.
Some images made by this superb optic on the E-P2: