The firmware to accommodate those P lenses bricked most 3rd party lenses as well. The AI vs. Pre-AI thing gets a lot of people tangled up. Not sure how to avoid that when trying to keep the same mount for 50 years. When they started having bodies at the entry level that had no focus motors in them it got even worse. Toward the end you knew it would mount, but had to consult a chart to see if it would AF.