35mm and 70mm

[technicolour]

Hi,

I remember posting a post (hehehehe) about 35 and 70mm a few months ago and i was wondering if someone could help me with someting i was pondering.

With 70 mm i belive the actual picture is 65 mm with 5mm for the soundtrack, does the same apply with 35mm?

If so, this would mean that the image was 35mm smaller than "Stills" 35mm film which would also explain widescreen

Am i right at all?


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Jim

[Shenan]

Remember that still 35mm pictures are placed on the film perpendicular to their orientation on 35mm motion film. In other words, motion picture cameras run the film vertically, while still cameras run the film horizontally. I also recall reading that the area of a still 35mm frame is roughly twice the area of a motion 35mm frame. I read this on an article somewhere on special effects where they said that some special effects were shot with still cameras mounted sideways and only using half the still frame. I don't know how 70mm relates to all this though. As a curiosity (again IRRC) IMAX film also runs horizontally through camera and projector, I imagine so they can get the gigantic frames without having to make special film. They also use an air stream instead of a pressure plate to keep the film on the projectors gate (don't know about the cameras though. Ok, I guess I'm going way beyond what I needed to say... Just recalling useless(?) information I have stored in my head.

Shenan

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[This message has been edited by Shenan (edited November 06, 2001).]

[Matt Pacini]

I don't remember the exact specs (I could look it up for you), but yeah, 35mm motion picture film is actually an image area of I believe 22mm, nowhere near the full 35mm. 35mm still photography does in fact use much more of the image area on the neg.
I boutht a few prints of movie trailers a while back just to see exactly how much was used, and how the soundtrack looked, etc. Pretty interesting.
As far as height goes, it varies wildly, depending on the format being used.

Matt Pacini

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