I just bought a 2.8C. I sent it out to get a Maxwell screen put in. I generally only shoot film on sunny days and have a ZoneSimpe technique on my web site that allows you to shoot at 1/250 of a second at f2.8, and 1/125 of a second at f4 if you are shy of using 1/500 except under special circumstances, without an ND filter. You get longer scale and an ideal negative for printing or scanning. There are downloads so you can try the process. It's all free. If you try the Rollinars, which I bought and intend to try, you won't be able to use ND filters anyway. Same goes for the wide and tele Mutars.