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-   -   New Article (https://www.dvinfo.net/forum/jvc-gy-hd-series-camera-systems/42111-new-article.html)

Sean Dinwoodie March 31st, 2005 01:01 AM

New Article
 
http://millimeter.com/mag/video_nab_13/index1.html

Chris Hurd March 31st, 2005 02:17 AM

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.

Sean Dinwoodie March 31st, 2005 02:30 AM

An interesting tidbit was the mention of 24P SD....

Kurth Bousman March 31st, 2005 03:27 PM

...and also the vcr that connects directly to a 23" apple display & plays sony dvcam.

Mark Kubat March 31st, 2005 06:50 PM

"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....

Robert Shuster March 31st, 2005 06:59 PM

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.

Chris Hurd April 1st, 2005 12:38 AM

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.

Steve Mullen April 2nd, 2005 10:41 AM

<<<-- 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.

Heath McKnight April 2nd, 2005 12:54 PM

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.

heath


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