I've got a 3a and am using 4x10 inch xray film in it (cut down from 8x10). I'm not super happy with the simple meniscus lens and I've been trialing a few lenses from Surplus shed..meniscus, achromat, double convex, plano convex or various focal lengths close to the original 133mm. I'm hoping the one I have installed now will yield a sharper image...waiting on having time to test..
The nice thing about the design is that it can be adjusted for optimum focus, and will accept lenses of the designed for focal length +/- a few mm's.
I'm shooting ''one-shot'' and using changing bag in the field to re-load. Here's an image from the original lens..