35mm film is most often projected at... ?

[leaftors]

Im trying to sign up for a forum and this is the security question. I don't know what the answer is, anyone know?

 

[j1clark@ucsd.edu]

Im trying to sign up for a forum and this is the security question. I don't know what the answer is, anyone know?

Current... and for the past nearly 80 or so years... 24 fps is the usual capture and projection speed.

 

[Tolin]

The theatre

 

[Mitch Gross]

This is incredibly sad.

 

[Ian-T]

2k

 

[Andrew Luczenczyn]

they still project film? lol jk

 

[Grug]

They normally project it at a screen don't they? That's what they do at my local multiplex.

 

[Grant Peacock]

Got it! After about a dozen attempts at the cinematography.com sign up, I have the precise answer : "24 frames per second". Use exactly that, and you are in.

 

[maranfilms]

I thought when projected it's actually really 48fps. shot AT 24P.

 

[Moseph]

I believe film projectors show each frame several times so that there's no severe flicker when the shutter is closed for the film to be advanced. I'd still call it 24fps though.

 

[Ken Hull]

This is incredibly sad.

+1 :grin:

 

[Rainer]

Generally captured at 24fps, projected at (2X24) fps.

 

[Barry_Green]

It is projected at 24fps. The film runs through the projector at a rate of 24fps. In order to reduce flicker, each frame is flashed on the screen 2 or 3 times. But that is in no way similar to 48fps or 72fps. It is always and only 24fps.

 

[Rainer]

To clarify, projected most often at 24 fps, displayed [A,B,A,B]X24/sec where A is frame and B is black (I'd be interested in a proper math notation way to describe it)

 

[Barry_Green]

The shutter on the projector alternately shows and hides the same frame multiple times.

The film runs through the projector at 24 frames per second -- therefore, there cannot be any more than 24 frames shown per second.

Each frame is flashed multiple times. This is in an attempt to smooth out and therefore reduce flicker. The film projector must close the shutter (blanking the screen) in order to move the next frame into position. If the film projector showed the frame continuously for, say, 90% of the time, and then blanked it for that last 10% to give the projector time to move the next frame into position, you'd notice a jarring pulsing. So they instead show the frame for more like 23% of the time, then blank for maybe 10%, then shown for 23%, then blank for 10%, then shown for 23%, then blank while the film projector moves the next frame into position. That way the alternation from bright to dark happens 100 times per second, which makes the flicker a lot less perceptible than if it was happening only 24 times per second.

Note -- I made up those 23%/10% numbers, I don't know what the actual numbers are, but in general the description should get the idea across.