EF protocol[]
- The protocol between the lens and the body is discussed here, in english and german:
- http://en.wikipedia.org/wiki/Canon_EF_lens_mount#Communication_protocol
- managed by the TX19A (SPI)
- see also lens data in the firmware
- LENS00.BIN: see http://groups.google.com/group/ml-devel/browse_frm/thread/f813fe19f9c9813d/c3f1f1fdcb9ecf9?q=#0c3f1f1fdcb9ecf9
- also in update file: at 0xf8eb0000/0xffeb0000 for 550d
- See Exif Makernote Tag 0x4015, see CR2 spec