Yes I know that the image is under-sampled at 5.6"/pix. However I don't really care that much about that part of the story. Unless you zoom in 400% your not going to notice the under-sampling. However you do notice the coma shaped stars w/o any zoom. As far as the specs are concerned here's a cut and paste from the "Land, Sea and Sky", aka Tak America webpage: -Flat field w/60 mm image circle -Image circle will accept medium format CC cameras or Digital SLRs The 85 + reducer combination doesn't come close to either a flat 60mm circle or 40mm circle as the stars at all edges and corners