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Accurate USB remote sync for single camera shots?

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Offline fudgey

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Re: Accurate USB remote sync for single camera shots?
« Reply #30 on: 18 / June / 2008, 17:11:18 »
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Now that looks... freaky :D.

You can probably achieve faster shutter speeds if you zoom in fully and override Av as narrow as it goes (F/16, but the real aperture may not be quite that small), Whatever you find, would be great if you can update it to http://chdk.wikia.com/wiki/CameraFeatures.
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Offline Microfunguy

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Re: Accurate USB remote sync for single camera shots?
« Reply #31 on: 18 / June / 2008, 17:17:17 »
Quote from: plasma_physicist on 18 / June / 2008, 16:22:13
I have taken some nice plasma images and decided to more work on characterization of the camera (A700).

Very, very interesting.
1/12,000 sec for such a modest camera is very encouraging.

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the shot time was drifting and jumping.

Are you referring to the exposure time or the accuracy of the delay after USB signal goes low ?

If the former, do you know how repeatable the delay-time is ?

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here is one of the images I took
Image:Picture 2.png - CHDK Wiki


Very, very nice.


David




 

 
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Offline plasma_physicist

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Re: Accurate USB remote sync for single camera shots?
« Reply #32 on: 22 / June / 2008, 11:25:25 »
This link wasn't working  couple of days ago  :o I thought I lost you guys . Thanks so much for the suggestions
I ll try different zoom and aperture override and also update the table CameraFeatures - CHDK Wiki.
with what I find or you can do it.

what I meant by jumping drifting trigger was the delay time the camera takes the picture after usb signal goes to zero.
Shutter speed is 70-80 micro seconds  for most shuts ( 90 percent of the time) not including of course the times it drifts to a place where I don't know what its doing. 

Soon we are going to start  experiments to study solar flares so I am hoping to get some cool laboratory flare pictures and
post them here. 
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Offline Microfunguy

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Re: Accurate USB remote sync for single camera shots?
« Reply #33 on: 22 / June / 2008, 13:08:27 »
Quote from: plasma_physicist on 22 / June / 2008, 11:25:25
what I meant by jumping drifting trigger was the delay time the camera takes the picture after usb signal goes to zero.


Do you know what range the delay varied over, did you log that value ?

Used with a pair of cameras for stereo, we can get average delay-differences of about 100 to 200 microseconds.

If the Canon shooting-sequence could be interrupted even later in the shooting sequence, maybe 'less variable' delays could be obtained.

(it is just a point-and-shoot camera !).


If it was useful, your workshop could probably build a beamsplitter device that allowed you to capture the plasma in stereo.



David
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