Dear Tokina, You may or may not know that your 10-17mm fisheye zoom lens is dearly beloved by the underwater photography fraternity. Fisheyes are considered 'special effects' lenses, but for underwater photographers the wide angle of view is perfect. We've been using it on crop sensor bodies for years. I would confidently guess that the majority of SLR underwater photographers have a copy of this lens, and are maybe even the majority of the market for this lens. However, many of us have now been tempted towards full frame by both of the recent Nikon and Canon offerings. While the lack of a full frame equivalent to this lens has been lamented for some years, its absence is being felt particularly acutely now. Please consider making an equivalent to the 10-17mm in a full frame format. There have been suggestions that you still have the plans for the old Pentax 17-28mm fisheye - a contemporary version of this would do nicely. Many thanks, the undersigned.