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The right loop.


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#1 Carl Nenzen Loven

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Posted 05 October 2016 - 05:50 PM

Hey everyone,

This is really messing with me and I am trying to find the solution to this.

I have shot with both Aaton LTR, and the Arriflex SR, SR2's and SR 3's.

Now when I was looking for a camera to buy, it was to be a sound sync one, and naturally people suggested the ACL. When I look at the manual it says in the best of worlds is just under 32 db. Now I have shot on the Sr2 recently and the only real noise that we hear is the daylight spool spinning. And I know that the loop really matters here so please, if anyone could show me a proper one.

Also if anyone has a video of their camera loaded and the sound, I would be happy to hear how it should sound :)

C


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#2 Carl Nenzen Loven

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Posted 05 October 2016 - 06:57 PM

Just to follow up. I found this video of this nice gentleman showing the NPR he used when he worked at BBC, and mine is a lot louder than this.

https://youtu.be/gvpNwVBqzhw?t=3m8s

C


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#3 Gregg MacPherson

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Posted 05 October 2016 - 07:00 PM

The ACL II specs I have give 28db. The three ACL IIs that I've scratch tested were all noisier than the old ACL I that I used to use. That camera had done an enormous amout of work before I got it, but was regularly serviced by an experienced guy, and only ever ran at 24/25 fps.

The things that I think affect the noise are...(me being no camera tech, just from using and familiarity)

- Fresh film was normally quieter. I assumed that the tech used fresh film when tuning the camera, still dimensionally accurate and lubricated.
- A service tech with the right experience.
- A properly serviced camera.
- Care with loops.

With the mag off the camera should be quiet, just the whisle of the mirror and a very faint tick tick from the movement. If not it needs the doctor.

The loops can be set as they say in the manuals. Check that 13 perfs are visible when you pull the fillm out the front. There should be a slightly bigger loop at the bottom than the top. If one is careless setting the loops and mounting the mag then the loops can shift towards the top or bottom and be a bit noisier. You can actually put the perf in a precise place on the pressure pad, inch the sprocket drive, check loop sizes, and position the camera claw so it will pick up a perf almost straight away.

Sometimes when you mount a mag the mag drive shaft does not click straight in, which can mean that the loops go a little off. It's a good practice if one is new to ACL or if one has temperamental mags, to take the take up door off after mounting the mag and while running, check the loop sizes. Certainly I would do this when scratch testing and familiarising oneself with the camera and mags.

On a properly serviced camera I found all the noise came out the back, where the nose of the mag fitted to the camera. If you use a soft barney it dissapears. I used an Arri BL barney that was just flopped on top without being wrapped at the front and it worked great.

Final thought. To compare the different cameras for noise, they all need to be properly serviced, using the same fresh film, with the same environment and background noise. The type of noise that the different cameras make will not be the same. Get a sound recordist involved with your noise tests. Talk to old sound recordists who have worked near these cameras years ago.

If you do do some testing, try and compare the earlier mags with the single piece pressure plate, to the tater ones with the centre pressure plate. Also, the sound deadening is not the same on all mags. Did all or only some have sheet lead?
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#4 Carl Nenzen Loven

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Posted 05 October 2016 - 08:22 PM

The ACL II specs I have give 28db. The three ACL IIs that I've scratch tested were all noisier than the old ACL I that I used to use. That camera had done an enormous amout of work before I got it, but was regularly serviced by an experienced guy, and only ever ran at 24/25 fps.

The things that I think affect the noise are...(me being no camera tech, just from using and familiarity)

- Fresh film was normally quieter. I assumed that the tech used fresh film when tuning the camera, still dimensionally accurate and lubricated.
- A service tech with the right experience.
- A properly serviced camera.
- Care with loops.

With the mag off the camera should be quiet, just the whisle of the mirror and a very faint tick tick from the movement. If not it needs the doctor.

The loops can be set as they say in the manuals. Check that 13 perfs are visible when you pull the fillm out the front. There should be a slightly bigger loop at the bottom than the top. If one is careless setting the loops and mounting the mag then the loops can shift towards the top or bottom and be a bit noisier. You can actually put the perf in a precise place on the pressure pad, inch the sprocket drive, check loop sizes, and position the camera claw so it will pick up a perf almost straight away.

Sometimes when you mount a mag the mag drive shaft does not click straight in, which can mean that the loops go a little off. It's a good practice if one is new to ACL or if one has temperamental mags, to take the take up door off after mounting the mag and while running, check the loop sizes. Certainly I would do this when scratch testing and familiarising oneself with the camera and mags.

On a properly serviced camera I found all the noise came out the back, where the nose of the mag fitted to the camera. If you use a soft barney it dissapears. I used an Arri BL barney that was just flopped on top without being wrapped at the front and it worked great.

Final thought. To compare the different cameras for noise, they all need to be properly serviced, using the same fresh film, with the same environment and background noise. The type of noise that the different cameras make will not be the same. Get a sound recordist involved with your noise tests. Talk to old sound recordists who have worked near these cameras years ago.

If you do do some testing, try and compare the earlier mags with the single piece pressure plate, to the tater ones with the centre pressure plate. Also, the sound deadening is not the same on all mags. Did all or only some have sheet lead?

Thanks for such a complete post Gregg.

I just learnt how to load the Arriflex BL-series, and the 35 III, and the loops there are essential when it comes to running silent. Now I know my ACL is in need of a CLA, but I wonder how much that can “fix” in this scenario, and what is actually just the lowest noise possible.

I considered a Barney as well, but finding a place that makes one seems a bit hard.

Also, I only use lenses on adapters, how much do you imagine that adds to it? When I did my last test it was without lens as well, maybe the weight blocks some sound as well?

C


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#5 Gregg MacPherson

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Posted 05 October 2016 - 09:02 PM

Please read carefully.  The noise is not just down to the design,  the service skill is important,  I always thought anyway.  If you need really quiet,  my guess is get an XTR or SR3 and have it serviced by a a guy who knows how to make them quiet.  Or just throw a barney over your ACL. Barneys come up on eBay now and again.  Getting a pro made one is too expensive maybe.  I don't believe it needs to fit ACL carefully,  just drape over the back.

 

Somewhere,  someone has an unused barney on the shelf just waiting for you.

 

It's not meaningfull to do noise tests without a lens,  though I supose it tells one something.  Should we not use the same lens for each camera?


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#6 David Cunningham

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Posted 06 October 2016 - 09:58 PM

Talk with Bernie at Super16 Inc. he serviced my ACL and now you can barely hear it running unless you are holding it against your head on your shoulder. I've even had my actors ask if it's really running. It should be about as quiet a camera as you'll see, certainly for the lower cost side of things.
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#7 Carl Nenzen Loven

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Posted 01 September 2017 - 06:55 PM

Talk with Bernie at Super16 Inc. he serviced my ACL and now you can barely hear it running unless you are holding it against your head on your shoulder. I've even had my actors ask if it's really running. It should be about as quiet a camera as you'll see, certainly for the lower cost side of things.

 

Do you happen to have any video of this camera running?

I am still now sure what I am doing wrong.

C


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#8 Robin R Probyn

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Posted 01 September 2017 - 10:06 PM

camera noise also comes out of the front/lens of the camera too.. an optical flat in your mattbox can help..  as I remember Aaton was always the less noisy camera .. some SR,s would sound like a tractor.. barney is your friend .. get one custom made up.. I doubt anyone is making them these days.. but should be easy enough to get custom made..


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#9 Carl Nenzen Loven

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Posted 13 September 2017 - 07:12 PM

camera noise also comes out of the front/lens of the camera too.. an optical flat in your mattbox can help..  as I remember Aaton was always the less noisy camera .. some SR,s would sound like a tractor.. barney is your friend .. get one custom made up.. I doubt anyone is making them these days.. but should be easy enough to get custom made..

I have already had a look for that.

None of the contacts I know of make them anymore.

I have even posted on this forum.


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#10 Gregg MacPherson

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Posted 13 September 2017 - 08:16 PM

Not to upset Robin,  who is a cool guy and always ready with some good natured wit (humour)......But .....

 

....different cameras make different sorts of noise.  Maybe Arri did/do throw a lot out the front,  but ACL,  the only problems I ever had were coming out the back,  somehow where the mag seats into the body,  or may be from the front of the mag itself where the loops are.  But this was very easy to solve.  I had/have a pro made barney for a 16BL and I just dropped it over the top to cover the back,  with the front of the body and lens port not being sealed up they way one might assume they should be.  It didn't fit perfectly but it worked perfectly.

 

So an improvised barney or a barney designed for another camera can work OK.  You don't need to go get a proper custom made barney,  but wait and one will turn up eventually.  Or you could have a clever friend make one.  The 16BL one was leather exterior,  corduroy lining and I don't know what the interior padding was.  Carl,  I can send you a couple of pictures if that helps....maybe an old 16BL one is easier to find.  If there is some lack of glamour or social acceptability to not having a properly fitting barney,  I say....forgettaboutit.  I have a pro made fitting ACL barney here and it is slow to fit,  slows the mag changes and has no advantage.  But I haven't used that one in anger....

 

Carl,  review any posts that give ideas on what can give noise or reduce it.  A tech who really knows those cameras helps.  I think the pitch and friction of the stock changes over time. Noise varies with stock.  Some stock may have more emulsion build up that may be affecting noise.  The pitch of the camera movement.  The type of sound deadening in your actual mags.  The plain vs centre pressure plate mags issue......and so on....Some of these issues you can experiment with and improve the noise easily...

 

Just remember that for a legitimate comparison you normally can change only one thing....If that sounds too arcane I can explain...


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