"Pathos" wrote in message
oups.com...
Hi Folks,

I am considering purchasing my first medium format camera, as I have
been working in 35mm, and do my own developing/printing. I am
interested in getting a larger negative to get good enlargements at
16X20 or possibly greater.

Don't go 6x4.5. That's a half-step. 645 is just half-frame MF.