I apologise in advance if this is not the correct place for this post but here goes.

As I am using PAL I'll use a PAL example but it applies to all systems. Let's say you open a standard PAL project in Premiere, you have 25fps. If your footage was shot at 25fps then for each frame on the timeline, you have one frame from your footage, all well and good. However, if you are shooting 50fps what will then constitute one frame on the timelime? as your timeline has 25 frames yet the footage has twice as many...?

Thanks

you literally counted 25 frames per second on the premiere timeline when shot at 50fps??

Wow! What camera do you have that can record at 50fps? That's 100 interlaced fields per second!

Perhaps I don't understand.

Ooooops!, actually I meant shutter speed...

OK. Well in that case the number of frames per second is identical, no matter what the shutter speed. Think of the shutter speed as being the length of time the shutter is exposing the "film". For example, a shutter speed of 1/500th second will still only record 25 frames per second. Each frame is exposed for 1/500th of a second. The shutter then waits until the next 1/25th of a second has been reached before exposing the next frame.

Now it makes sense, thanks Colin