Several concepts are linked below. None in production of course. http://petapixel.com/2012/12/17/nikon-patent-shows-a-back-for-turning-film-slrs-into-digital-c

Several concepts are linked below. None in production of course. http://petapixel.com/2012/12/17/nikon-patent-shows-a-back-for-turning-film-slrs-into-digital-cameras/ http://petapixel.com/2012/12/17/nikon-patent-shows-a-back-fo... http://petapixel.com/2011/04/08/another-concept-design-for-digital-film/ http://petapixel.com/2011/04/08/another-concept-design-for-d... http://petapixel.com/2013/08/16/convert-your-old-film-slr-into-a-digital-camera-with-the-digipod/ http://petapixel.com/2013/08/16/convert-your-old-film-slr-in...