This is a 2 1/4 x 3 1/4 lens. Aperture range is from F2.8-F32. Its super sharp, and although there is visible bubbling around the edge of one of the elements, this has somehow never affected picture quality, even with the aperture wide open (I can show samples of photos taken with it if you want). It's a great little lens, and I'll throw in a Graflex XL focusing ring for it, for free if you want. I'm super negotiable with the price, as it's attached to my now-defunct XL that I can't do anything with anyway. PM me if interested.