Hi, I just picked a 300mm f9 in copal 0 up on e-bay for £250 in as new condition. I know little other than it covers about 330mm at f22 at infinity, so I presume will cover 8x10 with ease at f32/f45 with a little room for basic field movements. I got it thru the post today and it is tiny, much smaller than my Nikkor sw 90 f8!!!! which will help make my future 8x10 outfit nice and light. I may have bought a lemon, but has anyone got any experience with these lenses, especially on 8x10??? As I am unable to shoot 8x10 yet (lacking film holders, lens boards, enlarger not yet repaired etc) I will not be able to find out for myself for some time. I assumed it would be similar to a G-claron, albeit with smaller coverage?