Canon Adapted Lens Compatibility
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It isn't widely known that the large image circle of medium format lenses can be deployed for shifting and stitching with Canon digital bodies: up to 35mm movements are possible with some configurations. Why would you do that when Canon already has a highly regarded range of L series TS lenses? Several reasons:
• Price: the cost of a Carl Zeiss Jena Biometar 80m f2.8 + Arax adaptor, for instance, is about one third the cost of a 90TS, and the performance is very similar. Many of the older Pentacon Six lenses are deservedly legendary, and available cheaply.
• Versatility: some systems allow medium format lenses to be mounted in such a way that parallax-free stitching is possible: a feat no Canon lens can accomplish. Also, bigger movements are possible without degrading image quality.
• Wider range of focal lengths: Hasselblad, Pentax and Mamiya have a wide range of lenses that can be used as EF shift lenses in wacky focal lengths: from the 30mm Arsat Fisheye to the 600mm Pentax FA.