From: Jonathan Walley (email suppressed)
Date: Mon Mar 27 2006 - 04:50:26 PST
Alain, Joost, and Tony,
Thank you for your input on my stroboscopy question. Per Joost's remark
on "persistence of vision," it's amazing how that idea has, well,
persisted. Last year I had several students complain about missing a
quiz question on flicker fusion and apparent motion because they had
been taught in their production courses that persistence of vision was
behind the illusion of motion in film. (That's probably a reversal of
the normal order of things - students in film programs probably get
more misinformation about production from their studies classes than
their production classes.)
I found a link to a very good little article on persistence of vision
through Fred Camper's excellent website. The link appears in Fred's
essay "The Trouble with Video," which will be familiar to veterans of
recent "film vs. video" skirmishes on Frameworks. That essay is here:
http://www.fredcamper.com/Film/Video.html
The link to Stephen Herbert's essay on POV is:
http://www.grand-illusions.com/percept.htm (you can get there by
clicking on the word "illusions" in Fred's essay, in the section
entitled "The Light." Anyone unfamiliar with Fred's website should
check it out.
Thanks again, everyone.
Jonathan
Jonathan Walley
Professor, Cinema Department
Denison University
Granville, Ohio
email suppressed
On Mar 24, 2006, at 10:21 PM, 40 Frames wrote:
>> Don't many flatbeds (e.g. Steenbecks and
>> KEMs) utilize a prism system without a shutter, and therefore without
>> a
>> flickering light?
>
Jonathan Walley
Professor, Cinema Department
Denison University
Granville, Ohio
email suppressed
>
>
> Yes, Steenbecks and KEMs operate without a shutter, instead they employ
> a rotating prism (usually 18 or 24 sided). And YES this prism shows a
> noticable flicker (even the KEMscope prism which claims to be "flicker
> free").
>
> Alain
>
> ================
> 40 FRAMES
> Alain LeTourneau
> Pamela Minty
> 425 SE 3rd, #400
> Portland, OR 97214
> United States
>
> +1 503 231 6548
> Skype ID: frames40
> email suppressed
> http://www.40frames.org
>
>
> __________________________________________________________________
> For info on FrameWorks, contact Pip Chodorov at <email suppressed>.
__________________________________________________________________
For info on FrameWorks, contact Pip Chodorov at <email suppressed>.