Upload & Sell: On
| p.1 #1 · 70-200mm f/4 IS focus slipping? |
I recently picked up a 70-200mm f/4 IS used. I got a fairly good price (which motivated my purchase) but ultimately I knew that I would most likely try the lens and then sell it. I just posted it for sale here on FM, and as I always do, I went over the lens exhaustively - way more exhaustively than when I purchased it. I discovered that the autofocus seems to slip when the lens was pointed up or down. Pointed up, it had to work harder going from infinity to close focus and pointed down, it had to work harder going from close to infinity. When it's level, it seems to work fine. I guess I never noticed it because the nature focusing - down usually equals closer focus and up usually equals further focus. Anyway, I immediately withdrew the FS add, but I'm wondering, is this a normal problem? Is it bad to use it like this? I've never heard of this before. Obviously the solution is to send to Canon but I was looking for a bit more information before I send it in. Any help you can offer would be greatly appreciated! Thanks.