I am searching for my first lens for 8x10 wet plate (6 inch lens board). I have determined I would like a Petzval and prefer some vignetting on 8x10 glass neg and will be shooting wide open (f4, f5, f6 depending on lens?) Should I be looking for a 10 inch to allow for light fall off on edges? Budget is 500-1000. Priority is landscapes but would be nice to shoot portraits as well. Could use some help as many lenses for sale don't specify coverage, etc. Thanks in advance!