18 fps vs. 24 fps

[Sundance]

How noticable is the difference between 18 fps and 24? I do intend to have plenty of camera movement, so do I really need a camera with 24 fps?

[Carlos8]

Hi Sundance,
Shooting at 18 fps you?ll obtain images with a noticeable strobo effect in the movements.
At 24 fps. that strobo effect is considerably attenuated. (the reproduction of the movements is more real).

On the other hand, if you got an XL camera, with a 220 ? shutter, i.e., you can shoot at 18 fps, with a more natural reproduction of the movements (except the abrupt movements).
Consequently, the fidelity in the reproduction of the movements depends on fps used and shutter angles of the camera.
With closer angles we can obtain more stroboscopic movements and sharper images and vice versa.


Hope this helps you.
Carlos.

[Nigel]

Always shoot 24fps. It looks much better--you would never record audio at anything lower than 7 1/2" IPS so why shoot slower than 24fps?????

Shoot 24FPS

[#Pedro]

24 fps looks much better.
1. Image seems to be sharper, as the grain is not regulary distribuited over the frame and with a higher framerate one detail will be represented thru different grains in each frame.
2. Movements are resolved much better, nearly no stroboscope effect. Camera movements appear steadyer. 24fps cannot be compensated with an XL shutter and 18fps. The XL shutter gives such long exposure times, that the singule frames don?t become sharp and even wiped during camera or object movements. This maybe aceptable and even good, when the object moves (looks like a "wiped" still), but really terrible when moving the camera or panning. A wiped background or landscape will cause headakes to anybody who?s watching the film, especially on a big screen. If you really decide to shoot with 18fps, at least switch to 24 fps when panning or shooting with moving camera (from the car etc.).
Pedro

[tom hardwick]

Lots of good advice here so far. But more points:

18 fps means a quieter camera at the shooting stage and a quieter projector at the show.

24fps is much better if a transfer to video is envisaged.

Splices in the gate hang around for a shorter time at 24 fps.

The projector flicker rate is an invisible 72 Hz rather than the visible 54 Hz.

Sound on film runs at 4"/sec at 24fps and only 3"/sec at 18. Dropouts at splices are less noticeable.

The film only runs 2 1/2 mins in the camera. Damn.

tom.

[AlexGfromUK]

Interesting that you brought that up, I was just thinking a couple of mionutes ago that the only thing that I hate rather than love about shooting super 8 is that you go through such a massive amount of 50ft cartridges to produce a decent amount of footage. I shot four carts for my final major project for college and my edited film is going to last about 2 1/2 mins. I can't afford to shoot 4:1. I was hoping for about 2:1. Frustrating.