At 2-9-2011 16:28, ultravy wrote:
> > So the problem in the Zoom can't be blamed to
> > crystals alone. Also how is Tascam able to produce a similar device
> > that doesn't have this drift or a drift that is so small that's not
> > noticalbe during normal video work?
>
>I have no idea about either of these devices. Is the Zoom known to
>have this extreme drift on every instance of that particular model,
>or are we talking about the experience of one or two people only? As
>I said, every instance of a device is different, although devices
>from the same batch seem to have a better chance of having similar speeds.
The drift problem of the Zoom has been reported by several people in
the DVXuser forum. Now you know how it works on the internet, you
never know whether they read it somewhere else and start repeating
it, or whether they observed the problem themselves. Again, I will
try to do my tests next week and post them to various forums so that
we can initiate a wide discussion about this.
> > Do they purchase they're crystal's from some secret factory? Also
> if playback can be guaranteed at a certain speed, then how is that
> done then? Don't use playback devices things like crystals or other
> electronics for timing as well?
>
>Sure, playback also isn't 100% exact. In general, cheaper devices
>will have looser tolerances (just as it's always been), so it
>probably gets tighter the more you spend. But you never get away
>from having to synchronize in professional environments.
>
> > What you're doing sounds interesting. Apart from the drift you're
> > also dealing with the absolute timing of each frame especially when
> > working with faster shutter speeds. You could get rid of the drift
> > somehow but will a genlock also make each frame start at exactly
> the same moment?
>
>Yes that's what genlock does, it synchronizes the capture down to
>the pixel level. It is absolutely crucial in live TV for example -
>if the cameras weren't pixel-level synced, then switching between
>them would cause a glitch.
>
> > By the way I shoot productions using two Panasonic GH2 camera's,
> one Europe model and one USA model, both set to 24fps and even with
> 30 minute shots I never notice anything of a drift, the only thing I
> > notice is the frames of both camera's starting at different moments
> > but for what I do, this isn't a problem, in the final product it's
> > not noticible.
>
>I use two GH2s for my 3D rig. As I said, the speed is different from
>body to body, so you may be lucky and have a pair that don't drift
>too much. Of course we're generally talking about reasonably small
>differences here, but they're pretty important for 3D.
So it depends on what you do, everything is relative. I was thinking
earlier today about how deejays in the past would create the phased
audio effect by using two identicial vinyl records on two turntables
and first sync them and then get them out of sync a tiny little bit
on purpose which wasn't difficult to do of course, it was harder to
keep them in sync :-)
I used the AF101 (AF100) for a while, it has genlock, but I didn't
like the electronic noise and the blurry image, I find the image
quality of the GH2 better. So the decision to the sell the AF101
again wasn't difficult to make :-). So I wouldn't recommend it to you
either. Yes it has genlock but it's also about 6 times as expensive
as the GH2 and image quality is worse as the GH2.
Is the GH2 the only "DSLR" cam you used so far? Have you worked with
the 5D or 7D yet? I love the image of the 7D but the moire effect can
be problematic (depending on what you do) and it has the annoying 12
minute clip duration limit. Still I haven't sold mine yet, I think I
will continue using it from time to time and I hope Canon will come
with new models more suitable for video work soon.
Rieni
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