Hi Chuck I told Debbie that some tracking would be helpful to keep trailing down. Even w/my 7.5mm Fisheye I get distortion at the edge of the circular image. You know 180 is fairly wide field and to expect crisp everywhere is beyond most peoples pocketbooks. The 7.5 is fine though specialized and the 16mm fisheye is good too, when used in creative ways, fine results happen. We have a photographer (unemployed and living in his van) that comes to the lab, he said being unemployed was one of the best things that has ever happened to him, he now can do more of his own photography. We processed some film w/ wide angle (20mm) images of circumpolar trails BUT he found a spot w/ a cross and tiki torches in the scene. The 4 hr exposure also picked up a red overall skyglow from Kahului BUT the shot was spectacular for artistic merit. I guess I'm saying "Go do it and HAVE FUN". Aloha Rob BTW gear is only part of the image, the photographer and vision are most important ;^)