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help me identify this part


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#1 Paul Frigon

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Posted 14 November 2007 - 04:27 PM

Hello

I received a rx5 yesterday, and there is this part I cant figure.
Is this an accessory ? Ive seen it on the pictures in a manual but no explanations.
Looks like its a tiny light bulb that goes right under the gate.
What is it for ? printing sound on the film ?!

Thanks for your help

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Edited by Paul Frigon, 14 November 2007 - 04:28 PM.

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#2 chuck colburn

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Posted 14 November 2007 - 04:33 PM

Hello

I received a rx5 yesterday, and there is this part I cant figure.
Is this an accessory ? Ive seen it on the pictures in a manual but no explanations.
Looks like its a tiny light bulb that goes right under the gate.
What is it for ? printing sound on the film ?!

Thanks for your help


Bloop light
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#3 Nick Mulder

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Posted 14 November 2007 - 04:38 PM

Its for sound yes but not optical sound no... - I dont know the exact process as I doubt I will ever have use for it (although one day I might read up on it for interests sake) but the bulb would flash a frame of film for registration later in the editing process.

It might make a interesting talking point key-ring or similar or there might be some Luddite film-maker out there who would really appreciate it (but probably has 7 of them already) - i.e. dont just throw it away !
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#4 Paul Frigon

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Posted 14 November 2007 - 05:48 PM

So its for sync, interesting.
Thanks for the answers
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#5 John Sprung

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Posted 14 November 2007 - 06:27 PM

So its for sync, interesting.

Yes, it's called a bloop light. The way it works is that it's wired to a box that the sound guy has. That box outputs a tone and turns on the light when a button is pushed. The tone goes on the tape, so nobody hears it but the sound person. The light simultaneously fogs a few frames of film. This serves the same purpose as clapping sticks on a slate, but does it unobtrusively. It was used primarily for documentary work. The name "bloop" comes from what the tone sounded like when you rocked it back and forth in a synchronizer. Definitely either keep it or put it up for sale.



-- J.S.
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#6 chuck colburn

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Posted 14 November 2007 - 06:45 PM

I believe the sync pulse came from the MST motor which also generated the pilot tone to sync the sound recorder.

http://www.bolexequi...om/MSTMotor.htm
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