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Alexa vibration issues


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#1 Nikk Hearn-Sutton SOC

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Posted 02 March 2015 - 01:07 PM

Greetings Programs...

I know this had been posted before but I can't find the thread. What causes the Alexa to vibrate on the sled and how to prevent this from happening. I'll be flying one in the next few weeks so I wanted to do my due dilegence before hand.

Thanks in advance.

Nikk
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#2 Robert Starling SOC

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Posted 02 March 2015 - 06:13 PM

It can only be a few things Nikk:

 

1. Something on the sled or camera is loose

2. You have flex in your mounting plate(s)

3. The sled or it's parts are flexing structurally

4. Accessories are flexing or vibrating

 

That's about it but there's always another angle or experience someone else here might have.

 

Good luck!

 

Robert


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#3 Philip J. Martinez SOC

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Posted 02 March 2015 - 07:32 PM

Hi Nikk,

I think you are looking for a mounting plate that will hold the Alexa at both the front and rear of the camera. People were talking about vibration when the camera was only mounted to the front. There are a number of "Alexa" brackets out there. PRO, XCS, Jerry Hill, Film-stuff, cam-tech. and my favorite http://www.cameraacc...m/products.html
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#4 Philip J. Martinez SOC

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Posted 02 March 2015 - 07:34 PM

The ALX-STBP Plate
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#5 Matthias Biber

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Posted 05 March 2015 - 04:50 AM

The key to avoid alexa vibrations is to brace the hook in the back. Otherwise the camera body is a huge lever that bends the dovetailplate, which results in vibrations.

The videos on my website show the flex that can be in alexa setups and how to avoid.

 

http://www.cam-jam.de/alexa.html

 

 


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#6 Nikk Hearn-Sutton SOC

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Posted 07 March 2015 - 02:16 AM

This is great. Thanks Fellas!!!
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#7 chris fawcett

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Posted 07 March 2015 - 05:54 AM

And there's the cheapo option!


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#8 Nikk Hearn-Sutton SOC

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Posted 17 March 2015 - 09:14 PM

Thats an easy hack!! Thanks you all!!

 

Cheers!!


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#9 rupert peddle

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Posted 18 March 2015 - 05:54 AM

Chris, what's the little washer / nut thing you used on the rear screw? Couldn't quite make it out in the video. Ta!


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#10 chris fawcett

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Posted 18 March 2015 - 06:08 AM

That's a little threaded washer that Tiffen gives away with its rigs. They also sell them for a couple of $.

You can make something similar, and every bit as good, or better, by taking any screw with the right size head to slot into your dovetail, and a very thin nut that fits into the rear recess in the camera. Some vigorous use of a metal file will probably be required to make it right.

I believe Peter Abraham was considering making these for his longplate. Perhaps he'll chip in.

This is indeed, as described, a hack, but it is the simplest, lightest, lowest, and cheapest solution!

All the best,

Chris
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