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From: MikeWhy on 19 Dec 2009 18:27
"David Ruether" <d_ruether(a)thotmail.com> wrote in message
news:hgjgme$o89$1(a)ruby.cit.cornell.edu...
>
> "Ray Fischer" <rfischer(a)sonic.net> wrote in message
> news:4b2d24d3$0$1652$742ec2ed(a)news.sonic.net...
>> Lucas <cauwels(a)xs4all.nl> wrote:
>>>"clw" <clw(a)ohsu.gov> schreef in bericht
>>>news:clw-79A4D5.07374918122009(a)news.isp.giganews.com...
>
>>>> Anyone here use a DSL[R] cameras video function?
>>>>
>>>> Is it any good or should I just get a separate video camera?
>
>>>Canon claims that their 5D Mark II is used as HD-video camera for several
>>>scenes in Hollywood productions... can't be all that bad... At a seminar
>>>they showed some footage....it was quite impressive!
>
>> It's not the quality of the video that's the question. If you use an
>> external mic, don't need to rely upon autofocus, and put the camera on
>> a tripod then you bet you can get nice results. But a lot of what
>> makes a consumer-grade video camera is missing or different.
>> --
>> Ray Fischer
>> rfischer(a)sonic.net
>
> The above is likely true, especially since I have NEVER, under
> ANY circumstance, no matter how taxing for the HD compression
> system, caught the Canon HDV (HD) HV20 camcorder showing
> ANY indications of image compression failure. The same was not
> true for the Panasonic FZ25 still camera shooting lower resolution,
> lower data-rate HD video. It often showed major compression
> artifacts with motion, and even with the camera still and on a tripod,
> weird compression effects were sometimes visible (as with unplayed
> keys on a piano "flickering" among different tones).

Can they be antialiasing artifacts from downsampling to video size? The 7D
has a minor problem with that in 720p video. I haven't seen a hint of it at
1080p.


From: Wolfgang Weisselberg on 20 Dec 2009 05:03
Lucas <cauwels(a)xs4all.nl> wrote:

> Canon claims that their 5D Mark II is used as HD-video camera for several
> scenes in Hollywood productions...

.... where they have dedicated focus pullers on staff ...

> can't be all that bad...

.... if you *know* what you are doing, *know* what you need,
have planned the scene and so on, and have the necessary staff
and gear and money to make it work as they want it.

If you have to ask, you really don't want a DSLR for video.

-Wolfgang
From: David Ruether on 20 Dec 2009 08:42

"MikeWhy" <boat042-nospam(a)yahoo.com> wrote in message
news:hgjngv$2u2$1(a)news.eternal-september.org...
> "David Ruether" <d_ruether(a)thotmail.com> wrote in message news:hgjgme$o89$1(a)ruby.cit.cornell.edu...
>> "Ray Fischer" <rfischer(a)sonic.net> wrote in message
>> news:4b2d24d3$0$1652$742ec2ed(a)news.sonic.net...
>>> Lucas <cauwels(a)xs4all.nl> wrote:
>>>>"clw" <clw(a)ohsu.gov> schreef in bericht
>>>>news:clw-79A4D5.07374918122009(a)news.isp.giganews.com...

>>>>> Anyone here use a DSL[R] cameras video function?
>>>>>
>>>>> Is it any good or should I just get a separate video camera?

>>>>Canon claims that their 5D Mark II is used as HD-video camera for several
>>>>scenes in Hollywood productions... can't be all that bad... At a seminar
>>>>they showed some footage....it was quite impressive!

>>> It's not the quality of the video that's the question. If you use an
>>> external mic, don't need to rely upon autofocus, and put the camera on
>>> a tripod then you bet you can get nice results. But a lot of what
>>> makes a consumer-grade video camera is missing or different.
>>> --
>>> Ray Fischer

>> The above is likely true, especially since I have NEVER, under
>> ANY circumstance, no matter how taxing for the HD compression
>> system, caught the Canon HDV (HD) HV20 camcorder showing
>> ANY indications of image compression failure. The same was not
>> true for the Panasonic FZ25 still camera shooting lower resolution,
>> lower data-rate HD video. It often showed major compression
>> artifacts with motion, and even with the camera still and on a tripod,
>> weird compression effects were sometimes visible (as with unplayed
>> keys on a piano "flickering" among different tones).

> Can they be antialiasing artifacts from downsampling to video size? The 7D has a minor problem with that in 720p video. I haven't
> seen a hint of it at 1080p.

Maybe... The HV20 does downsample from a 1080x1920 sensor to
HDV's 1440x1080, but without problems (ever). The Panasonic FZ25
starts with a FAR higher resolution and downsamples it to 1280x720 for
video - and ANY motion in the image may cause obvious image problems,
and much motion may cause major image problems (such as large patches
in the image changing color and/or tone in one or more frames). I suspect
that both tape type HD HDV is easier to compress/uncompress (it
certainly is during editing) than memory-card type HD AVCHD and its
variants, and also that Canon uses a superior codec for the compression
in its still cameras and camcorders. (I remember when Panasonic was
touting the image superiority of its MPG-4 24 Mbps AVCHD vs. MPG-2
25 Mbps HDV, and of course, the AVCHD "won" in the samples - BUT,
in practice, I have seen no appreciable difference in raw footage image
quality between the two file formats, but there is a BIG difference in how
easily the material can be edited, with AVCHD being the loser - and if
17 Mbps AVCHD is added to the mix, that also loses in image quality
compared with HDV...)
--DR


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