Is there a "crop factor" with a 35mm adapter?

[Mister Big]

Hi guys,

Wondering if like with certain digital SLRs, there is a crop factor when you put a 35mm lens on an adapter for an HVX. In other words, does a 50mm lens give you the same angle of view on an HVX as it does on a 35mm film camera body? Thanks!

 

[Gavin Garrison]

I was also wondering how you would calculate AOV with a 35mm adapter. Logically speaking, there must be a difference, as you're hitting two planes with the light.

 

[Huy Vu]

Theoretically speaking, there is no crop factor because the ground glass is as large as or greater than the 35mm standard. In fact, it's possible to get a wider FOV. Practically, whether you get a full FOV or not will depend on the lens itself. Cheaper and wider lenses vignettes heavily, requiring you to zoom in further and cropping your image. I believe the way to see whether you're getting full Academy FOV is to tape a piece of 8 1/2 x 11 paper to the wall, stand about 3ft away with a 50mm lens and see whether the paper fills your field of vision.