24fps, advantages?

[MovieStuff]

<BLOCKQUOTE><font size="1" face="Courier, Arial">quote:</font><HR>Originally posted by Mr Blackstock:
O.K, I will see if i have this right, shooting at 24fps enables easier film transfer, yet film shot at 18fps can still be transfered at atleast 24fps to video.
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Not exactly what I said, but perhaps I wasn't clear. If you shoot at 18fps and transfer to PAL video (not NTSC) it will come out more fluid than transferring to NTSC. The reason is that PAL video is 25fps and NTSC video is 30fps.

When 24fps footage is transferred to NTSC, every fourth frame is doubled to make up 6 additional frames per second (24+6=30). If you take footage shot at 18fps and double every third frame, you ALSO come up with 6 additional frames (18+6=24). Since 24 is darned close to 25, the on screen speed difference is less noticable and the even distribution of the additional frames for a PAL transfer reduces the appearance of strobing compared to the uneven number of frames necessary to stretch 18fps footage across 30 frames of NTSC.

Make sense?

<BLOCKQUOTE><font size="1" face="Courier, Arial">quote:</font><HR>Originally posted by Mr Blackstock:

While there may be better projection by filming at 24fps, the slightly less ideal of filming at 18fps would surely be a great deal cheaper? I intend to transfer, yet i am stuck with 18fps, even if i could shoot faster, could i afford the film usage?

Is there a real benefit to 24fps, other than ease of transfer. I need something more to justify the film cost. in melbourne, film costs $20, developing $15 (thats for b&w)
Any ideas?
<HR></BLOCKQUOTE>

Well, if you're in Melbourne, then you are dealing with PAL and you should be able to do an 18fps transfer pretty well. As I said, if every third frame is doubled, will bring you so close to 25 that the speed difference would be negligable. However, my preference would be to shoot at 24fps since you have the advantage of no 3:2 pull down in your country.

Roger


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Roger Evans
MovieStuff
http://www.afterimagephoto.tv/moviestuff.html

[MovieStuff]

<BLOCKQUOTE><font size="1" face="Courier, Arial">quote:</font><HR>Originally posted by technicolour:
As you said I cant see what a HUGE difference the extra 6 frames will make.

If you read the "20fps shoot+Xsfer - A new S8 standard for video?" post left by rodger, him and I were discussing altering a camera to run at 20 fps by ensuring it had a stable and "fresh" power supply so that when you goto transfer it you dont get fickler.
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Yes, but that only applies to "film chain", three bladed transfers to NTSC; not Rank transfers to PAL on a frame by frame basis.

Roger

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Roger Evans
MovieStuff
http://www.afterimagephoto.tv/moviestuff.html

[mattias]

> There is something called 3:2 pulldown that stretches your 24fps out to 30fps.

for the record, it's stretched out to 60 fps, taking advantage of the field system video uses to smooth out the difference a bit more. this means some video frames will contain two film frames at once, and some film frames will span three video fields. pretty important to remember if you're doing rotoscoping, scanning video back to film or simply want to restore the progressive frames for web streaming...

> So what about transfering 18 fps footage to PAL?
it's usually transferred at 16 2/3 fps with a "3 cycle" pull down (3 bladed shutter or electronically on a rank).

/matt