Best Suited Lens New Effective Focal Length and Aperture
90mm f/3.5 127mm f/5
110mm f/2.8 156mm f/4
127mm f/3.8 180mm f/5.4
140mm f/4.5 198mm f/6.4
180mm f/4.5 255mm f/6.4
100~200mm f/4.5 141~283mm f/7.4
When used with any other lens, optimum performance will be achieved by stopping down by 1 or 2 stops from maximum aperture. Vignetting will occur with 75mm Shift lens.