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Eclair ACL 25fps frame roll



A 50hertz TV or video monitor is EXACTLY 25fps so unfortunately the horizontal roll problem is with your sync motor. This would soon be confirmed by shooting sync sound and having the results telecined, as depending on the rate of roll, your sound would fall out of sync within about ten seconds.

You'd be surprised at how few motors actually run at the precise crystal speed the manufacturer claims. Certainly as the motor and the camera ages, more problems occur. It's probably best you get your entire kit serviced, this may eliminate the problem. If it doesn't, you'll have to plug in an external sync for your motor (not so easy for the ACL but very easy with an NPR) or an engineer who can tweak the crystal on the back of the ACL motor so it can be slightly over or under-run.

Regards

Robert




From: EclairACL@topica.com
To: EclairACL@topica.com
Subject: Digest for EclairACL@topica.com, issue 71
Date: Wed, 21 Nov 2001 04:05:41 -0800

-- Topica Digest --

	Motor Torque
	By ocularmagic@yahoo.com

	Re: Need help! Jaeger connectors
	By wy@warrenyeager.com

	Re: Need help! Jaeger connectors
	By super16acl@aol.com

	Re: Motor Torque
	By doodindee@hotmail.com

	Re: Battery Options
	By wramsey@bju.edu

	RE: ACL Batteries
	By wramsey@bju.edu

------------------------------------------------------------

Date: Tue, 20 Nov 2001 09:27:43 -0800 (PST)
From: James Warner <ocularmagic@yahoo.com>
Subject: Motor Torque


A while back someone gave the torque rating for one of
the motors, I think it was something like 20 N/m or
something close to that.  I can't seem to find it,
does anyone still have it?  Thanks.

James

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------------------------------

Date: Tue, 20 Nov 2001 10:20:03 -0800
From: "Warren" <res0fzlq@verizon.net>
Subject: Re: Eclair ACL Need help! Jaeger connectors


Y'know, if they'd learn how to spell Yeager correctly, I think the
connectors would work a lot better!

Warren Yeager, SOC
www.warrenyeager.com
----- Original Message -----
From: "L'Abominable" <l.abo@wanadoo.fr>
To: <EclairACL@topica.com>
Sent: Tuesday, November 20, 2001 2:25 AM
Subject: Re: Eclair ACL Need help! Jaeger connectors


le 20/11/01 7:37, cinesota@yahoo.com à cinesota@yahoo.com a écrit :

> It worked! Thanks Julian.
>
> I got the buggers out but what a pain. That settles it. I'm converting
> my ACL's to XLR and never looking back.  Anyone need some ACL power
> cables with Jaeger connectors?
>
> Cheers,
> Ray

True those Jaeger connectors are tricky to dismantle and solder back. Each
time you do there's a chance it dies and that's how my own cable got
somewhat fragile. So if you're ready to send it over to France, I could use
yours. I'll pay for the shipping.

By the way, I have a couple questions about our good friend ACL :

1. Anyone having a spare MIVAR motor ? I have the older fixed speed motor on
my camera and could use a variable speed one.

2. Anyone tried to power the camera from a 12 V DC transformer ? I don't see
why it wouldn't work as long as the transformer can deal with the 1.3 amps
the motor seems to ask for (according to Perry's site - I think read 0.8
amps somewhere else : maybe that's the older motor ?).

3. Once I tried to film a PAL TV screen using my 25 fps crystal, the bar was
slowly moving anyways... Did that ever happen to someone ? I thought that
using 25 fps on a 50 Hz screen would freeze the bar, which I therfore could
try to eliminate by a few trial and error starts of the camera.

Thank you for your help - and bravo for the acl web site.

At L'Abominable
(a film-makers coop about 10 km from where the acl was designed)
Nicolas Rey








------------------------------

Date: Tue, 20 Nov 2001 17:19:36 EST
From: Super16ACL@aol.com
Subject: Re: Eclair ACL Need help! Jaeger connectors



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I've used a 12 volt 1 amp DC transformer once or twice with no problem.

I don't know the fine details about PAL, but with NTSC, even though the
nominal frame rate is supposedly 30 fps, it is really 29.97 fps.  Therefore
to eliminate the roll it is necessary to use a 29.97 fps crystal, not 30. Is
PAL exactly 25 fps?, or is it fractionally different -- if so, that would
explain your problem. I bet Clive Tobin at www.TobinCinemaSystems.com would
know. Clive has also built a new multi-speed motor for the ACL. It's not
inexpensive, but hopefully it works.

Mark.



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<HTML><FONT FACE=arial,helvetica><FONT SIZE=2>I've used a 12 volt 1 amp DC transformer once or twice with no problem.
<BR>
<BR>I don't know the fine details about PAL, but with NTSC, even though the nominal frame rate is supposedly 30 fps, it is really 29.97 fps. &nbsp;Therefore to eliminate the roll it is necessary to use a 29.97 fps crystal, not 30. &nbsp;Is PAL exactly 25 fps?, or is it fractionally different -- if so, that would explain your problem. &nbsp;I bet Clive Tobin at www.TobinCinemaSystems.com would know. Clive has also built a new multi-speed motor for the ACL. It's not inexpensive, but hopefully it works.
<BR>
<BR>Mark.</FONT>

</HTML>

--part1_10.15cd9b76.292c30f8_boundary--



------------------------------

Date: Wed, 21 Nov 2001 04:59:39 +0000
From: "jason davis" <doodindee@hotmail.com>
Subject: Re: Eclair ACL Motor Torque





>From: ocularmagic@yahoo.com
>Reply-To: EclairACL@topica.com
>To: EclairACL@topica.com
>Subject: Eclair ACL Motor Torque
>Date: Tue, 20 Nov 2001 09:27:43 -0800 (PST)
>
>A while back someone gave the torque rating for one of
>the motors, I think it was something like 20 N/m or
>something close to that.  I can't seem to find it,
>does anyone still have it?  Thanks.
>
>James
>
>__________________________________________________
>Do You Yahoo!?
>Yahoo! GeoCities - quick and easy web site hosting, just $8.95/month.
>http://geocities.yahoo.com/ps/info1
>
>
james it was said to be 30mNm

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------------------------------

Date: Wed, 21 Nov 2001 00:04:19 -0500
From: "Wade Ramsey" <WRAMSEY@bju.edu>
Subject: Re: Eclair ACL Battery Options


If you are going the XLR route, use an XLR4 (4 pin, not 3 pin, which is for audio) and wire the + to the #4 pin, the ¯ to the #1 pin. This is the standard configuration for 16mm 12v batteries and will allow you to use Arri, NPR, etc., batteries or cables should you ever need to.

>>> wy@warrenyeager.com 11/17/01 12:32:43 PM >>>
Charge it right through the XLR.

Batteries have a + end and a - end.  Wire the cells inseries, the + of one
to the - of the other.  You end up with one + and one - left...at each end
of the series.  Solder that to a connector of some kind, and you have a
battery.  There aren't any other places to put other connectors, etc, so
your options are finite.  If you want another connector, for instance,
another type of plug for some kind of accessory, just run leads off the
connector you have already installed.  Since the wires are connect to an
open connection (ie, the connector when nothing's plugged in) the
electricity ignores unused connector and goes to the one which is plugged
in.

If you plug things in to both connectors, the voltage stays the same but the
ampreage (sp) drops, so you'll get the same voltage, but less battery time
(two things use more electricity than one).

Warren Yeager, SOC
www.warrenyeager.com
----- Original Message -----
From: "Joshua Tunick" <joshuatunick@hotmail.com>
To: <EclairACL@topica.com>
Sent: Friday, November 16, 2001 5:13 PM
Subject: RE: Eclair ACL Battery Options


> This sounds way easier and cheaper than my plan. I have a question
> though - I've never done anything with rechargables before, can you
> charge the pack through the XLR connector or do you have to build in a
> seperate socket. My electronics knowledge is pretty basic, any help you
> can provide would be apprieciated, I'd like to put together a few of
> these.
>
> Thanks,
>
> Joshua
>
>
> Warren wrote:
> > I bought 10 1.2v NiMh AA batteries (with solder tabs), soldered them
> > together in series, put them in a little box, but a pigtail with an XLR
> > connector on them, put a little velcro on my mags, and some on the
> > batteries. I build two, and then seemed to run the camera for about one
> > 400' load, so I built 2 more.  Then I hit the 'recycle' button on my
> > charger. Now, each battery will run the camera pretty much all day. I
> > have
> > too many batteries to manage!!  One went down, but I haven't fixed it
> > yet.
> > Three batteries is plenty.  I have an ACL II with the HD motor.  I
> > bought a
> > video tap, so I'll put a connector in the battery case for that too.
> > There's enought room.
> >
> > Each battery probably cost $40 or less. Alexander Battery has a really
> > cool
> > charger which I bought.
> >
> > PS...remember to recycle your NiMh and NiCad batteries. Any Radio Shack
> > or
> > Circuit City will take them.  Just ask at the cashier's desk, or look
> > for
> > the Richard Karn (Al, from TV's 'Home Improvement') posters.  For more
> > information, log on to www.rbrc.org
> >
> > (I shot the PSA series for the Rechargeable Battery Recycling
> > Corporation)
> >
> > Warren Yeager, SOC
> > www.warrenyeager.com
> > ----- Original Message -----
> > From: "Wade Ramsey" <wramsey@bju.edu>
> > To: <EclairACL@topica.com>
> > Sent: Thursday, November 15, 2001 1:42 PM
> > Subject: Re: Eclair ACL Battery Options
> >
> >
> > > Go for the 14.4v size.  You'll get a lot more footage out of it.
> > >
> > > Wade K. Ramsey, DP
> > > Dept. of Cinema & Video Production
> > > Bob Jones University
> > > Greenville, SC 29614
> > >
> > > >>> joshuatunick@hotmail.com 11/15/01 4:23:49 PM >>>
> > > Hello everyone -
> > >
> > > I just thought I'd let everyone know that I'm working on some
> > > different
> > > battery options for the ACL. Originally I was working on an Anton
> > > Bauer
> > > mount, and may end up doing it anyway, but I recently found out that
> > >
> > > DeWalt cordless tool batteries would work just as well and at a
> > > fraction
> > > of the price. I'm going to try and make a mount for those batteries
> > > and
> > > see how that goes. Thay are NiCad and you can get them at 12 volts
> > > and
> > > at 14.4 volts. I'm going to go with 14.4 volts unless someone can
> > > think
> > > of any reason not to - the heavy duty motor should do fine at 14.4,
> > > right?
> > >
> > > I'll keep you posted...
> > >
> > > Joshua
> > >
> > >
> > >
> > >
> >
> >
> >
>
>
>



Wade K. Ramsey, DP
Dept. of Cinema & Video Production
Bob Jones University
Greenville, SC 29614





------------------------------

Date: Wed, 21 Nov 2001 00:18:45 -0500
From: "Wade Ramsey" <WRAMSEY@bju.edu>
Subject: RE: Eclair ACL ACL Batteries


What battery and charger do you have?  If it's the original flat pack
VR-1 it recharges in 30 minutes in the fast charger that came with it.
The charger is supposed to cut off automatically.

There isn't any easy way to determine the state of charge on a NiCad,
because the voltage is so constant.  When it runs out it happens
suddenly.  Anton-Bauer uses a very sophisticated computerized circuit
that tracks how much went out so it knows how much to put back in.
Otherwise, you just charge it before each use, to be sure.  This is
not the best practice, because it leads to overcharging, which
shortens battery life.

The standard slow charge (trickle charge) is about 14 hours, with a
charge rate of 1/10 the ampere hour rating of the cells (1.2 Ah
cells=120 mAh charge rate.)  End of discharge is 1 volt per cell.  So
when the 12v battery gets down to 10v consider it discharged.  Don't
deep discharge, it can really damage the battery.


Wade K. Ramsey, DP
Dept. of Cinema & Video Production
Bob Jones University
Greenville, SC 29614

>>> gryanme@aol.com 11/19/01 6:19:08 PM >>>
Is there a way to tell if the ACL Battery is fully charged, half
charged or not charged enough for a shoot? I have a battrey and
charger, but I don't know the charge?






------------------------------

End of EclairACL@topica.com digest, issue 71




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