here are a number of photographers out there who consider the 6x7 format of medium format film to be the only really medium format type. Part of this has to do with the fact that it's right in between small format (35mm) and large format (4x5.
) It's quite a bit larger than the 645 format and much larger than 35mm format. It can also prove to be very difficult to work with simply because you need to be super critical about your focusing. . thephoblographer.com