Hello all!

Can anybody tell me the axact size of the half plate format?

I could find different explanations:
  • 4.5 x 5.5 inches
  • 4.25 x 5.5 inches
  • 4.75 x 6.5 inches
  • 4.25 x 6.5 inches


Which one is right?

I want to start with half plate wet plate collodion and want to do it with the correct format of the ambrotype era.

Thanks
Matthias