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Forum: Pentax Medium Format 02-26-2019, 10:48 AM  
Medium format needs a lot more light?
Posted By ProfessorBuzz
Replies: 61
Views: 6,775
I found the article a bit muddled. I use a Pentax 645z, A K-1, and sometimes a 645Nii or Hasselblad. I also have a Cambo 4x5" film camera.
It's all about the lens and area of film / sensor you are trying to illuminate. The 645z is trivial to step up to from a FF 35mm Pentax - the faster lenses tend to be f/2.8 instead of f/1.4, so that means you need to respect the light meter ;-) and probably add more light. I use the same 540FGZII on both the K1 and 645Z, as well as Godox AD400 and AD600Pro.

Larger lens diameter = more light gathering power = usually heavier. Plus ts harder to get a flat field on the film plane corner-to-corner.

The old 4x5 and 8x10 flim cameras tended to have smaller, slower lenses than the optical wonders we have today. Plus you are trying to cover a heck of a lot more surface area with photons at the focal plane.
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