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

Thanks bernie for the info
if the motor was performing badly would you expect the orange out of sync
light to illuminate,
it flicks on at the begining of the shot for a split second then turns off ,
or is the camera losing
sync speed totally different issue, i have just swopped crystals for a 25fps
and the light does the same
comes on for a split second then off again, everything else looks tight with
no play , i think i will have
to run another test with and without the redheads, any other info greatly
Mark Howard
----- Original Message -----
From: Bernie ODoherty <bernie_odoherty@emerson.edu>
To: <EclairACL@topica.com>
Sent: Friday, December 12, 2003 4:01 PM
Subject: 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
If anything, that would help, by blocking the light.
Perhaps it is a malfunction in either the motor, or the movement being too
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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