Lens serial communication

[leegong]

Hey , lain ,
The dumping data in my E-mail box , thanks so much .
It will take me some time reading them , will tell you the result as soon as i find it .

Kind regards,
Leegong

[coderat]

[leegong]

[coderat]

[leegong]

[leegong]

[astronomer]

The pin 5 is somehow linked to the magnetic strip reader inside the AF-S/AF-I lens. This is only presented in lens with built in AF motor and the frequency of output is related the rotation speed of the AF element. See the image below for reference from service manual.

And some additional information, it seems the new AF-S lens has flash memory inside their rom chip and host all the lens correction information in it. And the firmware of the lens can be flashed through the body. I never seen this in older AF-D lens.

[astronomer]

[coderat]

[coderat]

@Lain:
can you check pulses on Pin 5 and Pin 8 once with AF working, once with manual focusing. There are several pulses possible: rotation of manual-focus-ring and focus plane position detection (based on GMR).

In fact focus distance encoding in serial data is not precise: usually some value 1...8 that is actually a range index. Having a pulse signal for exact detection opens a possibility to show it on LCD (if it is measured by camera).

Best regards,
coderat