I own a Polaroid Land 250, but I'm not happy with it... the focus isn't precise and I would like to control the exposure and deep of field like a normal film camera. Please, can you suggest to me some good completely manual polaroid camera with a good lens that fit with the modern polaroid film?

About polaroid format : is always the same format or there are choice like in the film (35mm, 120mm ecc...) ?