I photograph with a hasselblad 503CW and a Phase one IQ80 back. I photograph animals, so use the Hasselblad Variogon 5.6 140-280mm zoom lens. Today, after 8 years of using this lens I made a shocking discovery. I made a test, comparing this lens side by side with my hasselblad 150mm lens, I discovered that enlarging the 150mm lens image to match images shot with my zoom lens at any zoom distance, the 150mm lens produced a far superior sharper image. Even comparing an image shot at 140mm vs 280mm, the 140mm zoom image is sharper than the 280mm. So in other words, the longer the zoom, the blurrier the image. Has anybody done comparisons with other hasselblad telephoto lenses? the non-zoom ones? are they sharp? I'm considering buying one in the 200- 350mm range, not a zoom this time, but a regular one. Do they get blurrier the longer they get? Am I better off just sticking to my 150mm lens and enlarging in post?