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JVC GY-HD Series Camera Systems
GY-HD 100 & 200 series ProHD HDV camcorders & decks.


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Old March 31st, 2005, 01:01 AM   #1
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New Article

http://millimeter.com/mag/video_nab_13/index1.html
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Old March 31st, 2005, 02:17 AM   #2
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Linkified.

Thanks, Sean!

One thing about that particular HD100 article though, I sure hope Leitner didn't write it, because there's a very misleading statement there...

"stealing a page from Canon's XL series, a removable, bayonet-mount lens (borrowing XL's mount too?) in the form of a Fujinon servo 16X zoom bundled with the camcorder."

The HD100 most definitely is NOT borrowing the Canon XL lens mount!

The removable, bayonet-mount lens isn't stealing a page from Canon's prosumer camcorder, but rather Panasonic's nearly-ten-year-old 1/3" professional shoulder mount broadcast camera line, the AJ-D200 series which also used 1/3" removable bayonet-mount lenses similar to the HD100.
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Old March 31st, 2005, 02:30 AM   #3
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An interesting tidbit was the mention of 24P SD....
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Old March 31st, 2005, 03:27 PM   #4
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...and also the vcr that connects directly to a 23" apple display & plays sony dvcam.
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Old March 31st, 2005, 06:50 PM   #5
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"non-working Panasonic"

er, so we're treated to perhaps another Balsa wood version...?

yikes...

I thought the 24p HD Panasonic thing was likely to have been shipping around NAB?

How can they honestly hope to quash Z1U sales otherwise? Like, who's gonna w...a....i....t....???

Crazy....
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Old March 31st, 2005, 06:59 PM   #6
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My rep hadn't heard that before

Millimeter reported that the 100 does SD 24P. Saw my JVC rep today and she was unaware of that. If Sean doesn't know - how could Millimeter? Chris or Sean - Who was the author of the Millimeter article? Do we know him? Nobody mentioned the 1/3in to 1/2in mount adapter. Ain't no big deal 'cause there aren't any 1/2HD glass anyway. But there is a 1/2in to 2/3in adapter from Century. Does this mean I can go from 1/3in to Zeiss DigiPrimes? Sean says too many stops will be lost. I say 1.2k HMI.
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Old April 1st, 2005, 12:38 AM   #7
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Robert, the authors were S. D. Katz, David Leitner, Dan Ochiva, and Bob Turner. Hard to say which one was responsible for the HD100 part of that article.
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Old April 2nd, 2005, 10:41 AM   #8
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<<<-- Originally posted by Chris Hurd : Robert, the authors were S. D. Katz, David Leitner, Dan Ochiva, and Bob Turner. Hard to say which one was responsible for the HD100 part of that article. -->>>

David wrote the HD100 story on what minimal info we had. The JVC uses some 1/3" mount -- who cares which one because there are only a couple of Fuji lenses to choose from and they'll fit of course.

It's also supposed to be bundled with an adapter for 1/2" mount lenses. No specification from JVC yet.

90% will use the supplied lens, anyway.

But David does have an error about DOs. It is not true that "HDV's MPEG-2 compression is “interframe” — compressed over a 15-frame span in the case of 1080i camcorders like Sony's, and over a 6-frame span in the case of 720p camcorders like JVC's — so dropout on HDV's ¼in. tape can cause corruption of the entire GOP (group of pictures). Imagine a 6- or 15-frame freeze as the MPEG codec encounters a dropout in playback."

All I, P, B macroblocks are scattered, for JVC, over a 60 track area. We know from DV that a DO gets a fraction of the 2 tracks used for each frame thereby killing a blocks, perhaps forming a line.
So a similar DO will wind-up killing a few macroblocks. And since this is TS these errors will have minimal impact. (Plus ECC is used to protect every block.) You'll see macroblock glitches, not a 1/2 second DO.

If the macro-block that dies is in an I frame, it is possible it could affect later P/B frames too. But, we are dealing -- with a 6 frame GOP -- so we have very small probabilities. Certainly no reason to need HDD. Nor to worry. Nevertheless, I feel DVCAM tape adds confidence because of its QC.

Sony, is far more vulnerable, of course.
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Old April 2nd, 2005, 12:54 PM   #9
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I think what they meant was that "stealing a page from Canon's XL series" equates JVC deciding a big selling point for the XL's was the removable lens. So they decided to add a removable lens to help sell more units.

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