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Subject: Re: [AE] fluorescent flicker in video
From: Steve Oakley <steveo@practicali.com>
In-Reply-To: <list-4625928@media-motion.tv>
Date: Tue, 14 Feb 2012 11:12:27 -0600
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Message-Id: <7D2982CF-1955-4A81-99BD-E8AFB2A1788A@practicali.com>
References: <list-4625928@media-motion.tv>
To: "After Effects Mail List" <AE-List@media-motion.tv>

generally speaking, slower is better, but most cameras won't shoot at a =
shutter speed equal or very close to the FPS rate... some do. 1/25th =
won't work at 29.97 but some cameras will do slow shutters. ok for =
static B roll, but probably not good for most shots.

ya at 1/100th you certainly risk getting phased at the dark side of the =
light pulse ( that sounded SOOOO trekie :) ) but you can flip the camera =
on / off or change the shutter up down to try to get to a better spot in =
the cycle. 1/50th is generally the best place, but sometimes 1/100th =
works better. just have to try it and see.

s


On Feb 14, 2012, at 10:58 AM, Jim Curtis wrote:

> I think you went the wrong way, Steve.  An exposure of 1/25 of a =
second would guarantee up to two full cycles, whereas 1/100 could fall =
in between every other cycle and produce darkness, presuming a square =
wave light source that's on for 1/25 of a second, and off for 1/25 with =
no lag.  Right?
>=20
>=20
> On Feb 14, 2012, at 10:43 AM, Steve Oakley wrote:
>=20
>> you need to shutter the camera at 1/50th or 1/100th in PAL / 50.000hz =
line frequency countries when shooting 23.976 / 24/ 29.97/30
>>=20
>=20
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