I'm on Mamiya C330 no.3, it's been a challenge to get a working one. This one is a bargain KEH body and an excellent KEH 80mm lens.
I'm wondering about the focusing. It seems like it comes in from blurry and slowly gets sharper and sharper, and then becomes blurry again, without ever getting perfectly sharp in the ground glass. It gets really close but it's still a touch soft, and then begins to get blurry again.
Is this normal? It seems to be less of a problem in close up shots than in shots a couple of feet away.
The image on the ground glass isn't produced by the taking lens but rather
the upper viewing lens. I wouldn't worry about it unless the resulting images
on film are not sharp.