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Weird ghosting on footage


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#1 Gareth Blackstock

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Posted 04 February 2018 - 05:30 PM

Hello,
I was hoping to get some thoughts on a strange affect on some footage I recently got back.
During most parts of the 100ft there is a ghosting or double exposure affect, initially I thought it was just the bright parts of the image, but it seems throughout to be the same, and it fluctuates a little.
The stock is 7293, hand processed and pro scanned. I had the same stock processed that I had used in 2 other cameras that same day, and that came back fine.

One person I already asked suggested lens but was not entirely sure.

Anyone see this before?


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#2 Samuel Berger

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Posted 04 February 2018 - 05:42 PM

I've seen this before in an Eclair NPR that had been converted to Super 16 and used regular 16mm Zeiss lenses at f/22.

 

 

But that camera had other issues.


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#3 Simon Wyss

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Posted 05 February 2018 - 01:04 AM

Shutter timing lost to me. Repair


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#4 John Rizzo

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Posted 05 February 2018 - 07:38 AM

Shutter is out of sync.


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#5 Gareth Blackstock

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Posted 05 February 2018 - 07:37 PM

Thanks for the replies, it has also been suggested to me the claw may not be engaging all sprockets leading to a weave effect. Looks like I better pull her down and adjust.
Cheers
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#6 Dom Jaeger

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Posted 07 February 2018 - 06:40 AM

You can check the shutter timing easily enough by marking the film and watching through the lens port as you inch the camera over. If the timing is out you will see the film move before or after the shutter covers the gate aperture.
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#7 lars preisser

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Posted 20 February 2018 - 03:15 PM

hi i also have a ghosting effect, but its more that lights become really long - vertically (see the traffic lights in the still)

I wonder if thats also a claw/shutter sync issue on my bolex h16?!

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  • Screenshot 2018-02-20 21.11.56.jpg

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#8 Adrian Sierkowski

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Posted 20 February 2018 - 03:57 PM

Most likely is. This used to be an effect some people did on purpose (and which some people like me are looking into in the future for a video)


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#9 Samuel Berger

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Posted 20 February 2018 - 03:58 PM

Most likely is. This used to be an effect some people did on purpose (and which some people like me are looking into in the future for a video)

 

You can do it on a Filmo 70 DR by not pushing the pressure plate against the gate after you load the film.


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#10 lars preisser

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Posted 20 February 2018 - 05:15 PM

yes its quite a nice effect,  but I wish it could be turned off and on easily- on the bolex it does not seem to be the pressure plate.


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#11 Dom Jaeger

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Posted 20 February 2018 - 05:24 PM

Yes that streaking is a classic example of the shutter being out of phase, and the film being exposed as it is transported.

I wasn't sure about the OP footage being the same fault because it looks more like a double exposure than a streak, but we haven't heard back from Gareth about whether his camera shutter timing is out or not.

On a Bolex, you need to remove the front and reset the gear meshing to get the shutter timing right.
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#12 Dom Jaeger

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Posted 20 February 2018 - 05:50 PM

You can do it on a Filmo 70 DR by not pushing the pressure plate against the gate after you load the film.


If the pressure plate isn't pressing against the film it can move with the loop during the exposure phase, which creates a similar effect to an out of sync shutter, although not as consistent. You'd have to completely remove the pressure plate on a Bolex, rather than leave it open, since you can't close the door on a Bolex if the pressure plate is fitted but not pushed all the way into the gate.
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#13 Samuel Berger

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Posted 20 February 2018 - 06:16 PM

If the pressure plate isn't pressing against the film it can move with the loop during the exposure phase, which creates a similar effect to an out of sync shutter, although not as consistent. You'd have to completely remove the pressure plate on a Bolex, rather than leave it open, since you can't close the door on a Bolex if the pressure plate is fitted but not pushed all the way into the gate.

 

Here's an example of that:

 

Edit: That's not my test, just something I found a while back when researching the Filmo.


Edited by Samuel Berger, 20 February 2018 - 06:17 PM.

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