Thread: [Gphoto-user] manual focus on a Nikon DSLR

Hi all,

I'd like to be able to drive the focus on a Nikon DSLR. From reading
the archives it seems that this is only possible in live view mode
(this means when the shutter is open and light falls on the CCD, is
that right?). The thread I found was:

http://sourceforge.net/mailarchive/forum.php?thread_name=20101207082046.GA3659%40jet.franken.de&forum_name=gphoto-devel

However if I try this I get:

$ gphoto2 --capture-preview --set-config /main/actions/manualfocusdrive=100
*** Error ***
Failed to set new configuration value 100 for configuration entry
/main/actions/manualfocusdrive.
*** Error (-1: 'Unspecified error') ***

Is there anything else I can try? My logfile is here, in case it's any help:

http://www.vips.ecs.soton.ac.uk/development/my-logfile.txt

John

On Thu, Oct 13, 2011 at 01:28:31PM +0100, jc...@gm... wrote:
> Hi all,
> 
> I'd like to be able to drive the focus on a Nikon DSLR. From reading
> the archives it seems that this is only possible in live view mode
> (this means when the shutter is open and light falls on the CCD, is
> that right?). The thread I found was:
> 
> http://sourceforge.net/mailarchive/forum.php?thread_name=20101207082046.GA3659%40jet.franken.de&forum_name=gphoto-devel
> 
> However if I try this I get:
> 
> $ gphoto2 --capture-preview --set-config /main/actions/manualfocusdrive=100
> *** Error ***
> Failed to set new configuration value 100 for configuration entry
> /main/actions/manualfocusdrive.
> *** Error (-1: 'Unspecified error') ***
> 
> Is there anything else I can try? My logfile is here, in case it's any help:
> 
> http://www.vips.ecs.soton.ac.uk/development/my-logfile.txt

It returns error 0xa004

PTP_RC_NIKON_InvalidStatus

I am not sure why.

Does doing a preview shot afterwards and draining events with:
	gphoto2 --capture-preview --wait-event=1s --set-config /main/actions/manualfocusdrive=100 --wait-event=2s --capture-preview

Change anything?

Ciao, Marcus

Hi Marcus, thanks for looking at this.

On 15 October 2011 20:20, Marcus Meissner <ma...@je...> wrote:
> On Thu, Oct 13, 2011 at 01:28:31PM +0100, jc...@gm... wrote:
>> I'd like to be able to drive the focus on a Nikon DSLR. From reading
>> the archives it seems that this is only possible in live view mode
>> (this means when the shutter is open and light falls on the CCD, is
>> that right?). The thread I found was:
>>
>> http://sourceforge.net/mailarchive/forum.php?thread_name=20101207082046.GA3659%40jet.franken.de&forum_name=gphoto-devel
>>
>> However if I try this I get:
>>
>> $ gphoto2 --capture-preview --set-config /main/actions/manualfocusdrive=100
>> *** Error ***
>> Failed to set new configuration value 100 for configuration entry
>> /main/actions/manualfocusdrive.
>> *** Error (-1: 'Unspecified error') ***
>>
>> Is there anything else I can try? My logfile is here, in case it's any help:
>>
>> http://www.vips.ecs.soton.ac.uk/development/my-logfile.txt
>
> It returns error 0xa004
>
> PTP_RC_NIKON_InvalidStatus
>
> I am not sure why.
>
> Does doing a preview shot afterwards and draining events with:
>        gphoto2 --capture-preview --wait-event=1s --set-config /main/actions/manualfocusdrive=100 --wait-event=2s --capture-preview
>
> Change anything?

No, sadly:

$ gphoto2 --capture-preview --wait-event=1s --set-config
/main/actions/manualfocusdrive=100 --wait-event=2s --capture-preview
Waiting for 1 seconds for events from camera. Press Ctrl-C to abort.
UNKNOWN PTP Property 5013 changed
UNKNOWN PTP Property d103 changed

*** Error ***
Failed to set new configuration value 100 for configuration entry
/main/actions/manualfocusdrive.
Waiting for 2 seconds for events from camera. Press Ctrl-C to abort.
Killed

It wanders off into swap death before being killed by the system, I
guess it's capturing a lot of preview frames and holding on to them.
The lens does not move. If I ask for a logfile:

$ env LANG=C gphoto2 --debug --debug-logfile=my-logfile.txt
--capture-preview --wait-event=1s --set-config
/main/actions/manualfocusdrive=100 --wait-event=2s --capture-preview
Killed

I get an 83MB file! I shan't attach it to this email. It doesn't seem
to get as far as the focus:

$ grep manualfoc my-logfile.txt
$

John