[Frameworks] Phase flicker and print timing?

[George Monteleone]

Yeah, I was thinking most film printing technology probably predates this
problem becoming common.  Was just curious if there was some kind of stock
"frame-by-frame sine wave" flicker setting on printer lights to cancel
phasing, haha.  At a certain point, engineering a solution to this problem
ends up equaling the time and expense of a proper reshoot.

Frankly a camera with an adjustable shutter angle at the source is the far
more reasonable solution.  The problem went away at 12 fps, larger shutter
angle probably fixes it at 24.   Digital fix would work but Filmouts are
expensive too.

I've found / read HMI / flourescent / streetlight phasing isn't always a
problem on a Bolex, but it's a real crapshoot, pretty much impossible to
predict without a test at the location or just using a more sophisticated
camera with reliable monitoring, flicker control hardware and stuff.



On Mon, May 8, 2017 at 7:52 PM, Francisco Torres <fjtorrespr at gmail.com>
wrote:

> now there are pocket sized hmi's..... amazing.
>
>
> 2017-05-08 18:26 GMT-04:00 Julian Antos <julian at chicagofilmsociety.org>:
>
>> LEDs really are the end of art as we know it!
>>
>> On Mon, May 8, 2017 at 5:20 PM, Christopher Ball <cbifilms at gmail.com>
>> wrote:
>>
>>> I never heard of such a thing.  It wouldn't work on a continuous
>>> printer, only on a step printer or optical printer.  The fastest way to
>>> deal with that now would be to digitize, fix and then print back to film
>>> (if film is your final medium)
>>>
>>> On Mon, May 8, 2017 at 3:54 PM, George Monteleone <
>>> georgemonteleone at gmail.com> wrote:
>>>
>>>> Hi all.  I was curious if 16mm lab printers are typically equipped with
>>>> any kind of "deflicker" mechanisms for footage that has phase flicker.
>>>>  Obviously there are digital tools for such a thing, but for printing
>>>> directly from negative, was curious if color timers have any tricks up
>>>> their sleeves to cope with these issues.
>>>>
>>>> It's Bolex footage, so imperfect motor sync partially to blame; LEDs
>>>> and/or sodium vapor lamps were also part of the issue, I think.
>>>>
>>>> Thanks,
>>>> George
>>>>
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>>
>>
>> --
>> Julian Antos
>> Chicago Film Society
>> www.chicagofilmsociety.org <http://www.northwestchicagofilmsociety.org/>
>> 773 827 8991 <(773)%20827-8991>
>>
>>
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>
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