I have always used a 80mm to enlarge 35mm for convenience as I have a large enlarger (Durst 138) and can use the same lens for MF. however, in a bid to make bigger enlargements with less column extension I tried a couple of 50s and have severe vignetting at most but not all enlargement sizes. Is this caused by not using a recessed lens panel. It lookes like mechanical vignetting to me. I recall having the sme problem with a different lens on a Devere 504 but my memory might be failing me.
I have a Devere 108 and cannot even use a 80 due to bellows compression but have masses of extension so have used a 105mm for average enlargements of 35mm. But, seeing as I want to go bigger I have to start using the 50mm and would dearly like advice on:
a) the vignetting issue with the 138 durst
b) what sort of recessed panel might I need to use the 50mm on a devere 108 or am I stuffed?