Posted by David McCall on 10/13/06 14:15

<furles@mail.croydon.ac.uk> wrote in message
news:1160744648.245160.62770@b28g2000cwb.googlegroups.com...
>
> David McCall wrote:
>
>> But you knew all of that anyway. The 3 bladed shutter in the
>> projector doesn't affect your perception of motion. It alters
>> the flicker rate to make it fast enough that most people will
>> accept it as a solid (non flickering) image on the screen.
>
> I agree with most of what you wrote; but most cinema film projectors do
> not use three bladed shutters, two bladed ones are much more common.
> As an alternative some machines, e.g. Kinoton use a single blade
> running at twice frame rate. Three bladed shutters are available for
> some machines, but are little used; their main application being in
> venues which show silent films at lower frame rates.
>
> Three bladed shutters were more common in 16mm projectors, and some
> machines had shutters which could be converted to either two or three
> blades, either manually, or automatically, depending on the projector
> speed, Bolex and Graflex for example.
>
Thank you for your contribution.

David

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