I've just bought a MPP MicroPress camera (see my Intrepid vs MPP MicroPress thread for more on that exciting story...) and I've just read that the early version didn't have the international standard back.

Apparently the older versions had a .2 inch/ 5.08mm register, and the later versions had the international standard of 4.8mm. I'm not entirely sure how to tell if I have the early or later models, so I guess I should try and measure the register to see which one I've got.

My question is - how do I measure the register of a large format camera's back?

Or... how can I tell if I have the early or later version of the MicroPress?

Any help would be much appreciated!