MY personal opinion is that my Revuenon is better than the three Porst I have had.

Hi again... I'm wondering... is there any real difference between Revuenon 55/1.2 and Porst 55/1.2?

OK, thanks for your feedback. Today I received Helios 44... so now I'm looking forward to Revuenon...

My Revuenon 55/1.2 has a Pentax K (not A) mount. It fits perfectly and I have to use the green button when shooting it. I only shoot it in manual (the only way!). Once you set your dial on M, turn the aperture ring to the desired aperture (usually 1.2), focus, and when in focus, hold still while you push the green button, you will hear a sssshclick (very low) and press shooter. You got it. Yes, you still need to press the green button even if you shoot wide open (f1.2), so the camera measures the light. You will be fine. I sold my K5 and now, I use the K3, fine too.

hi Pepe, so LBA gained another victory and it looks like I ordered Revuenon 55mm f1.2. I can see that you're using this lens with K-5. My question is: could it be mounted easily? No compatibility issues? Chuckie in his comment (lens review page) mentioned "abnormal position of the aperture-coupling lever" so this made me a little nervous...