Hi everyone, first post!

Been a lurker and generally familiar, although far from competent with 6x6. I love analogue, so have ventured into LF.

I have a 'no budget' set up, scratched together off eBay and diy:
Kodak specialist 3 rail camera
Ross of London telemetric 6.8 300mm
Elgeet no.3 universal shutter
DIY brass lens to shutter converter
Weston exposure meter.
Home made film holder (camera is a half plate)

Conundrum is: Weston is "accurate" for my Mamiya 330, ie if I do what it tells me I get decent negs.

When I meter for the big Kodak I have to allow 8 stops more exposure (!) to get a decent neg.

Why?

Cheers, Rob