Quote Originally Posted by Jerevan View Post
Am I correct in assuming 12x16.5 cm is the same thing as the halfplate size, which has the same external size as 5x7 and 13x18? Since I've already made at least one mistake regarding inches and metrical sizes, I'll ask this time around...
Half-plate = 4.75 x 6.5 inches = 121 x 165mm rounded to whole numbers. Allowing for the normal precision with which film sizes are given, especially by some Americans ('3x4 inch' for 3.25 x 4.25 inch quarter-plate), yes, you're right. I'm pretty sure that my one half-plate holder is marked 12,1 x 16,5 cm. The millimetre ain't gonna make much difference...

Incidentally, half-plate ISN'T half of whole-plate (6.5 x 8.5 inches) -- it's half an inch (12.7mm) bigger on the short dimension -- but quarter-plate IS a quarter of whole-plate.

Cheers,

R.