# 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 |