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Arri 35-3 mag for Arri IIC?


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#1 Yoji San

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Posted 12 April 2010 - 07:25 PM

Hi there,
usually I ask directly Tim Carroll since he has all the answer
but I start to feel bad writing him every time
I hope to find the answer by someone else this time
My question is, can I use a 1000' mag from Arriflex 35-3 on a Arri IIC? Or will the load by too much for the IIC motor?
I have a Thoma Crystal motor II if this make a difference
Thanks for your time and consideration
Best
Yoji
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#2 John Sprung

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Posted 12 April 2010 - 10:24 PM

My guess is it would be OK. Back before there was a III, we had adapters to put 1000 ft. Mitchell mags on the II-C.




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#3 Tom Jensen

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Posted 12 April 2010 - 11:24 PM

You can use a 400' Arri III mag on a 2C but you can't use a 2C mag on an Arri III. All I can say is give it a try with a dummy load and see what happens. If the motor starts baking, then no. Why are you doing this.
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#4 Yoji San

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Posted 13 April 2010 - 12:15 AM

John & Tom,
Thanks for the answer
So if I listen to John, the IIC motor should be able to handle the load since there was a time...

The reason why I would consider it was that it would be nice to be able to use 1000' load, no other particular reason, but like Tim says, the resistance could be too great and the motor could cook
And I probably care too much about the motor to take the risk

Thanks for the answer, hope to bump into someone who did try it
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#5 Mike Panczenko

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Posted 13 April 2010 - 01:36 AM

I'm pretty sure I remember hearing that the weight is too great for the 2C motor. Never actually done it, but I don't think it is safe.
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#6 Yoji San

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Posted 13 April 2010 - 04:30 AM

I'm pretty sure I remember hearing that the weight is too great for the 2C motor. Never actually done it, but I don't think it is safe.



Thanks Mike

I received an answer from a Panavision technician who says it should be OK if I stay at 24fps
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#7 Tim Carroll

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Posted 13 April 2010 - 09:12 AM

Yoji,

So you got a Thoma motor for your IIC, congratulations, that's good to hear.

I use Arri III 400 ft mags on my IIC all the time, in fact they're the only 400 ft mags I have.

Here would be my concern with using the 1000 ft mags on the IIC. When was your camera serviced last? What shape is the Thoma motor in? The 1000 ft mag will definitely put more strain on the motor and on the drivetrain in the IIC body. If the camera is fully tuned and lubed, and the drivetrain is "tight", and your Thoma motor is in good shape, and you have a good charged battery, and the drive gear between the camera body and the 1000 ft magazine is in good shape, and you stay at 24 fps, you should be okay.

If, on the other hand, your camera is in need of a good Clean, Lube and Adjust, or the Thoma motor is not in great shape, or the drive gear between the camera body and the 1000 ft magazine is worn and sloppy, or your battery is dodgy, then I'd be very careful.

It would also be a good idea to have the 1000 ft magazine checked, as the take up tension/torque is adjustable on those, and you don't want it to be too tight or too loose.

Best,
-Tim
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#8 Yoji San

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Posted 13 April 2010 - 10:16 AM

Tim,
Thanks for once again bringing your knowledge to the table

Yes I got lucky enough to come across a motor ;)

I don't feel adventurous enough to take a chance with it, plus 35-3 mag aren't cheap

Thanks everyone for your help, it is much appreciated
Yoji
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#9 Tom Jensen

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Posted 13 April 2010 - 05:51 PM

Thanks Mike

I received an answer from a Panavision technician who says it should be OK if I stay at 24fps


Did you ever consider asking an Arri tech? :huh:
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#10 Yoji San

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Posted 14 April 2010 - 02:01 PM

Did you ever consider asking an Arri tech? :huh:


I consider Tim an honorary Arri tech :P
The technician at panavision is also quiet an Arri expert, but you're right I could have asked Arri directly, I guess I like things more complicated
I'm convinced now that I won't be going that road but thanks for you input Tom
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