I'm not sure what happened - I use a film camera, a Minolta Maxxum 7000 and something happened yesterday that has never happened before. It keeps telling me that the subject can't be focused except in manual mode on matte screen, but the camera won't focus clearly in manual mode either. This is a little long but I wanted to present as clear a picture of what is happening as I Could. Here's what happened - I used the camera on Sunday afternoon and it was fine. I mentioned to my husband that I'd like to try some macro shots. He put his 105mm macro lens on the camera [we both have minolta systems] and it wouldn't focus clearly. Feeling it was just my impatience, he removed the macro lens and told me to try one of his extension tubes. I put the extension tube on and put my usual 70\210 zoom back on and I took a few shots of some bugs and all seemed fine. We then went out to take some photos of area barns, For this I removed the extension tube from the camera. The camera would not lock in a focus on anything and would not focus clearly in manual mode either. Deciding the problem might be weak batteries, we installed new ones - it didn't help. I changed to my 50mm lens - same problem. When I changed back to the 70\210 the camera suddenly functioned fine again! I removed the lens again and put it back on and the camera wouldn't work. I repeated the process several times till the camera finally functioned normally again etc. etc. it seems to happen randomly. The lens always snaps into place properly so its not that I haven't installed right. I've had the camera for years and am well aware of how to change a lens. Anyone have any idea what could be wrong? Is my camera's life about to end? It was produced back in 1986, but I've taken very good care of it, never been dropped or bumped. I guess I'll have to take it in for repair?