I just got my K to M4/3 adapter and I tried using some of my Pentax glass on the E-P2. The magnification feature, which is linked to the 'OK' button, is awkward to turn on and off, and I read that it's been improved on some of the later cameras. I discovered a tip that alleviates the problem somewhat by not requiring a press on the 'OK' button to turn off the magnification. I had my 'Fn' button set to One-Touch White Balance, so I switched the button functions of the 'AEL' and the 'Fn' buttons. So now, I still have to press 'OK' in the mode with the green box, but to turn off the magnification, I only have to tap the 'AEL' button instead of reaching for the 'OK' button again. Still not perfect, but slightly better. I do wish Olympus gave the option of deactivating the magnification upon shutter half-press. If anyone knows of any other workarounds for the focus assist magnification on the E-P2, please share it with me. Thanks!