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With this adapter you can connect a camera with a camera bayonet.
By using the large M48x0.75mm thread, vignetting can be efficiently avoided, e.g. from a DSLR full-frame sensor. Compared to small T2 threads (M42x0.75), the adapter creates a higher free internal diameter.
This adaptor screws directly into the Canon EOS body and enables you to connect objectives and adapters with M48 (M48x0,75) 2" filter thread. The EOS mount is much wider than M48 so the adapter can be mounted completely into the camera body. The real optical length is 0 mm!