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RE: Eclair Cameras: shooting 24fps - flicker on test roll

-----Original Message-----
From:	MARK HOWARD [mailto:mark@howard3596.fsnet.co.uk]
Sent:	Fri 12/12/2003 6:34 AM
To:	EclairACL@topica.com
Subject:	Eclair Cameras: shooting 24fps - flicker on test roll

Hi to everyone again and thankyou Ian ,i had already sent
a test roll for telecine when i posted the flicker and redhead light
question,the beta tape is back and there is a very noticable flicker
from start to finish, the shutter has not been modified to the 144
degree angle and if viewed through the gate there is one pass of the 
shutter that has no mirror visible the the next two shutter passes
show the mirror just creeping into shot on the S16 enlarged side of the 
gate, its not a lot,would this cause a flicker across the entire
frame, I have checked that it is right across the frame by using black 
card to cover variuos parts of the screen, also the telecine house 
transfered it 4:3 and not S16 so I am guessing that the part of the 
frame that is missing from the telecine would be the S16 enlarged
side of the gate were you would expect the flicker to be isolated.
The test was shot using 800 watt redheads plugged into a domestic supply 
at my house which has wireing and old power boxes under the
stairs and dating from the 60's or am i clutching at straws.
I have spoken to les Bosher who as usual is very knowledgable and
helpfull ,but before sending it off just wondered if any one else using 
the standard shutter of 180 degrees with an S16 acl has seen any
similar flicker.


Hi Mark,

Bernie O'Doherty here....I worked with Les at Sammy's.
I don't think that flicker would be caused by the mirror creeping into the shot.
If anything, that would help, by blocking the light.
Perhaps it is a malfunction in either the motor, or the movement being too slack.
If the motor is not running well, speedwise, and slightly varying in speed, this can be transmitted to a slack movement, and thus amplified. The end result will be a variation in the EXPOSURE. So, for example, one frame will be a twentyfourth of a second. The next, a 23.9 of a second, the next a 24.01 of a second and so on.....end result being image flicker.
Hope this helps,


Bernie o'

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