I recently bought a three way tripod head with 3 bubble levels on it. Even with all of this I just can’t seem to make properly levelled pictures with it. I’m doing everything correctly; the head is not mis-threaded, the camera’s weight does not exceed the limit, and I’m setting everything according to the bubble levels (2 at a time). So why do I still get consistently slanted pictures? This issue is important for me, because I use a film camera with no hot-shoe on top, so its a must to level the camera with the tripod head.