Besides being really really pretty, this is a WORKING lens! It makes gorgeous pictures.
It covers 8X10 so well I'm almost positive you could use it on a 10X12 also. Covers 8X10 with ample movements.
I hope you'll check out this page of photos. The last 5! were made with this lens. The last 3 of those 5 were made with front element removed and using the rear alone. This makes it a 17 1/2" f12 or so, and the soft glow is brilliant!
$285 is a steal to put yourself in creative mode with such an antique.