So, I took my N70 out to shoot some pictures the other day and discovered that it refused to fire in Manual mode with my Nikkor AI 50mm lens. I've tried it with a Nikon AF D lens in both AF and M mode and it works perfectly. At this point my solution is to just use the AF lenses exclusively, but I really like the pictures I get from the old AI lenses and the N70. I've also tried the AI lenses on my N90s with absolutely no issues. Anyone got any ideas?