(I had the words Nikon and Sigma in the subject line, but that inspired a list rejection!) http://www.dpreview.com/news/0512/05122201sigmahsmd200.asp Sigma confirm issue with Nikon D200 Thursday, 22 December 2005 "Sigma has confirmed that there is an incompatibility issue between its HSM equipped lenses and the new Nikon D200. Specifically the HSM lenses do not operate when the 'AF-ON' button is pressed on the rear of the camera. This does not affect auto-focus carried out using the shutter release button (half-press). Sigma has stated that this is due to a *firmware bug in the lens itself* and will soon be introducing a free of charge firmware update for affected lenses. Following is a list of HSM equipped lenses which would require an update for the D200 camera: Fixed Focal Length Lenses 14mm F2.8 EX ASPHERICAL HSM 30mm F1.4 EX DC HSM APO MACRO 150mm F2.8 EX DG HSM APO MACRO 180mm F3.5 EX HSM / APO MACRO 180mm F3.5 EX DG HSM APO 300mm F2.8 EX HSM / APO 300mm F2.8 EX DG HSM APO 500mm F4.5 EX HSM / APO 500mm F4.5 EX DG HSM APO 800mm F5.6 EX HSM / APO 800mm F5.6 EX DG HSM APO 800mm F5.6 EX HSM / APO 800mm F5.6 EX DG HSM Zoom Lenses 10-20mm F4-5.6 EX DC HSM 12-24mm F4.5-5.6 EX DG ASPHERICAL HSM 17-35mm F2.8-4 EX DG ASPHERICAL HSM APO 50-500mm F 4-6.3 EX HSM / APO 50-500mm F 4-6.3 EX DG HSM APO 70-200mm F 2.8 EX HSM / APO 70-200mm F 2.8 EX DG HSM APO 100-300mm F4 EX HSM / APO 100-300mm F 4 EX DG HSM APO 120-300mm F 2.8 EX HSM / APO 120-300mm F 2.8 EX DG HSM APO 300-800mm F 5.6 EX HSM / APO 300-800mm F 5.6 EX DG HSM " gawd.. k
