First a bit of background. I'm in the very early stages of building a 16x16 wet plate camera. So this weekend at a estate sale when I saw a box of lenses I couldn't resist. This is what I got. https://drive.google.com/file/d/0B0x4BFkDspnrLUhCbVNnWTdfaWM/view?usp=sharing I had the most hope for the Paris Darlot and a new process lens with markings of 150mm and f22 (on lensboards) There is also a Wallensak Velosticmat series II 12" lens but its ruff, has no iris and won't cover my area. With that in mind I whipped up this lens tester to see what I had. Its nothing fancy just a 16" square box with a piece of velum on one end and lens board on the other. it does the job but not well. https://drive.google.com/file/d/0B0x4BFkDspnrN3pPRHJxR01sSzg/view?usp=sharing After testing the first two lenses I found that the Paris Darlot came into focus at 16" from the subject and covered no problem. The process lens had great magnification but came into focused at 7.5" from the subject. Could be great for macro but not what I'm after. Am I doing something wrong? Can't seem to find focus on subjects further away then 16". So my question is, is there a better way to evaluate the lenses short of building a lens board for each and pushing and pulling my box halves together. Only the three lenses mentioned have any marking the rest are total unknowns. Some have glass elements on the front while others have it on the back of the barrel. I'm waiting on View Camera Techniques from the library when it is transferred in to freshen up on my operations but any help/advice in the mean time would be greatly appreciated.