Tim Ward
Forum Replies Created
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What Dave said.
The REAL difference that comes into play is which camera looks better. You can tweak the looks of the cameras, but you should get a cleaner picture out of the EX3 because that larger sensor will generate less noise in the image, which would also mean a cleaner key. The larger sensor also means you can achieve shallower depth-of-field (focus) which will result in a blurrier (read: smoother) colored background which will make keying easier.
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Both the EX3 and XF305 record 8-bit 4:2:0 Long-GOP video. HD-SDI is uncompressed (1.5 Gb/s). When you record from it, you bypass the camcorder’s internal codec. I don’t know (and can’t find it in the owner’s manuals) if they output 8-bit or 10-bit or what color space the HD-SDI output uses but I’d assume that it’s 4:2:2 (and not 4:2:0), which is more important for chroma-keying than bit depth or bit rate – within reason. I would use the EX3 because of its 1/2″ imager (compared to the XF305’s 1/3″ imager).
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Shoot/record at 1080i60, then field-blend the video. This will give you a 1080p30 look, which is also a little softer.
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[Richard Crowley] “I don’t know if this might be of any help…”
Kind of. I’m actually bypassing the CA327/M5 intercom system, and straight-wiring the connectors to just run a TW signal along the same 14-pin cable using the intercom channel’s wires within the mult. I’m basically putting the intercom cable inside the mult instead of taping it to it. A beltpack connects to the mic connector on the camera. I tried to be as specific as possible about what I was doing and how I was doing it in my first post.
I’ve actually read some of the stuff from your site a couple years ago. It seems this was a fairly common modification that people used to do, although I can’t find the specific wirings of how it’s been done. It also may have been primarily on 26-pin and not 14-pin (like mine). Would you have any idea of the components needed to remove the noise? Am I on the right track with my grounding solution?
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Yeah, that’s the most information I could find from either company. It tells about the option of “extensive modification” but doesn’t tell how to do it.
I know I’m stirring up issues from 1992, but we are ramping up our mobile webcasting, and I got these 3 DXC327/CA327/CCUM5 camera chains for free from a sister government agency who was upgrading, and we don’t have the money to spend on 21st century gear!
I also have a couple of DSR370’s that I purchased a couple of M5A’s to work with over 26-pin, but that’s a more difficult intercom situation (that currently just uses TW lines taped to the 26-pin cables).
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Chuck, I’ve scoured ClearCom’s and Telex’s websites, and Google, and the only thing I’ve come up with from ClearCom/RTS is RTS saying that “extensive modification” is required to run TW on multicore lines. If you’ve got something in your database that could help, I’d sure appreciate it.
Tom (and Chuck), that’s what I was thinking – to use an isolation transformer in the CCU. I’d assume it would go between the TW ground and CCU chassis ground?
Also, I did find this in someone’s expounding on RTS’s list of tips:
- “c) If the CCU is TW compatible and not earth grounded, connect to the TW line directly, or the two wire port of the VIE306.
- d) If the CCU is TW compatible and earth grounded, use an isolation transformer and safety capacitors and connect to the TW line or VIE306 directly.”
So maybe this is the way to go? Any idea on what specs/ratings the transformer and safety capacitors should be?
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I’ll search it out and let you know. Thanks for the tip!
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I don’t know anything about it, but Softron Media’s OnTheAir CG with a Decklink HD Extreme 3D might work, giving you HD output with key.
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Cool! Thanks Chuck.
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Yeah, luckily this is just a temporary setup for one project. If it was anything more permanent, then we’d invest in some hardware and a VAR.