Aperture messages

Control (from Body to Lens)

Example message, space separated header, payload and checksum:

f02000018503 3f7500001400141c0000020101030002010000002f1516 050255

payload byte no.	vales, meaning
1	changes when focusing: 1d = AF, 4C = MF, 3F = when no focus is done
4,5	aperture control range: 1413 for F2.8 -- f417 for F16
6,7	same values as 4,5
12,13	each oscillate between 00 and 01, so I use them as odd or even counter