OK, now we're getting close to my heart. I really love this little lens, so will probably over-price it and wind up keeping it :~')) Dan's wonderfully useful 1890 Benjamin French & Co. Catalog says this is 10 1/2" focus and covers full plate for portraits or 8X10 in the field! The patina on this one is just magnifique. I love it. Glass is gorgeous. You loosen the lock and slide the tube forward to access the waterhouse slot that normally stays hidden underneath out of any stray light path. I do not have any stops. They can be carefully made with old broken dark slide phenolic I think it's worth $225. I plan on shooting it tomorrow on my firewood trip.