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3 genlock cameras on ebay... 5hrs
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daverj
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Joined: 19 Jun 2009
Last Visit: 25 Nov 2014

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PostPosted: Wed Feb 01, 2012 4:15 pm    Post subject: Reply with quote Add User to Ignore List

If there are very fine lines on the diffuser then maybe they beat against the color grid filter on the CDD?. Different beat patterns might shift the colors since not all color stripes would be illuminated at once.
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daverj
Vintage Video Wiggler


Joined: 19 Jun 2009
Last Visit: 25 Nov 2014

Posts: 7476

PostPosted: Wed Feb 01, 2012 4:40 pm    Post subject: Reply with quote Add User to Ignore List

smrl wrote:
Yeah I did try the slow shutter mode, but it only outputs one frame!

I think I might be able to feed it into my TBC which has a "freeze" input and sync it with the trig. out.

Also I was shocked by the 1/100,000 shutter mode - pointing it at a halogen bulb it looked completely off but emitted an eerie dull silver glow. Very surreal.


Interesting. Does that mean that if you set it to 8 seconds and wave the camera around, that you get a new image every 8 seconds that is an average of the previous 8 seconds? Or is it just a stop frame kind of thing where you get a single frame grab, and it's held for 8 seconds?

Or are you saying that once you go to that mode it never changes. Just stays frozen? If that's the case I wonder if tripping the trigger input would make it grab a new frame.

I found the manual:

http://alacron.com/clientuploads/directory/Cameras/SONY/dxc390_manual. pdf

In the specs it says the trigger input is TTL. That means zero to 5 volts. And you must be careful to never go below zero or above 5v. In fact zero to 3.5v would work fine for TTL.

That means you can probably feed in a square wave oscillator from your modular if you are careful to limit the voltage range of the signal. Voltage controlled freeze frames would be cool.

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smrl
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Joined: 01 Feb 2011
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PostPosted: Wed Feb 01, 2012 5:43 pm    Post subject: Reply with quote Add User to Ignore List

Yeah, I had considered using an oscillator as well! It averages across frames, but then outputs a single frame, followed by black for the remainder of the exposure. So I need a way to store the frame in a framebuffer. I can use the WEN output which is on the DB9 connector on the back, (probably TTL level as well?) which might only trigger every new frame. The manual is ambiguous and doesn't go into much detail about these WEN signals. Lot of work just to get a freeze frame but voltage-control over the rate would definitely be something worth trying
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daverj
Vintage Video Wiggler


Joined: 19 Jun 2009
Last Visit: 25 Nov 2014

Posts: 7476

PostPosted: Wed Feb 01, 2012 6:15 pm    Post subject: Reply with quote Add User to Ignore List

For anybody interested, there's a 3-CCD genlockable camera on ebay, but no lens. Typically 3-CCD cameras have very sharp images, but need more light because of the beam splitter that sends the image to the three CCDs.

http://www.ebay.com/itm/HITACHI-HV-D30-Compact-3-CCD-Camera-/140691718 432?pt=Camera_Lenses&hash=item20c1e14120

Seller has very little feedback, but 100% positive. So be cautious, but the current bids are quite cheap.

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smrl
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PostPosted: Wed Feb 01, 2012 6:19 pm    Post subject: Reply with quote Add User to Ignore List

This one has RGB output as well - a feature some of you might want to keep your eye out for...
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daverj
Vintage Video Wiggler


Joined: 19 Jun 2009
Last Visit: 25 Nov 2014

Posts: 7476

PostPosted: Wed Feb 01, 2012 6:37 pm    Post subject: Reply with quote Add User to Ignore List

smrl wrote:
Yeah, I had considered using an oscillator as well! It averages across frames, but then outputs a single frame, followed by black for the remainder of the exposure. So I need a way to store the frame in a framebuffer. I can use the WEN output which is on the DB9 connector on the back, (probably TTL level as well?) which might only trigger every new frame. The manual is ambiguous and doesn't go into much detail about these WEN signals. Lot of work just to get a freeze frame but voltage-control over the rate would definitely be something worth trying


Not familiar with the WEN signal, but it sounds like a good guess that it would be a TTL level or something at least compatible with that. You could look at it on a scope to be sure.

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smrl
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PostPosted: Wed Feb 01, 2012 6:53 pm    Post subject: Reply with quote Add User to Ignore List

Good chance it will work, I think WEN stands for "write enable", as in, the frame is returning, grab it now.

http://pro.sony.com/bbsccms/assets/files/mkt/indauto/Brochures/is-1108 -a.pdf

There's a timing diagram with the WEN signal on these cameras.
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daverj
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PostPosted: Thu Feb 02, 2012 3:06 am    Post subject: Reply with quote Add User to Ignore List

Yup. It looks like you can either use it as a write enable gate, or use the rising edge of it to trigger a single frame capture.
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