Does anyone know of a coated 300mm lens f6.3 or faster that can be found in a re liable shutter that can do 1/225 or 1/250 AND cover 8x10 thats sharp all the way out to the edges? My Nikkor M 300mm f/9 in it's copal#1 is an excellent lens f or color, but if I use any kind of a filter for B&W my negatives come out too th in. I could push the film---I'm shooting Tri-X @ 320 and T-max @ 400---but I'm paranoid of grain(a 35mm days flashback, I suppose) as I want to enlarge to 40"x 50" max for a museum display. Thanks for any and all suggestions!