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Regular lenses for film are not quite perfect for digital due to the location of the rear nodal point. Film does not care about the direction of the light rays, but digital is an issue. Digital lens design is better adapted for a digital. A great fun lens, and my "standard" lens is the Pentax 10-17mm fisheye zoom which gives 180 degree to 75 degree (28mm equivalent.) Obtained mine pretty cheaply on the old ebay. Noticed one on ebay coming up tomorrow morning in the USA. I have a K10D , which is great for non astro stuff.
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