If one has the shutter control turned off, what shutter speed is used when in 720 50P mode? Does the camera use the double shutter speed rule for each mode, i.e. 25P 1/50th, 50P 1/100th etc?

I think, if you don't set a shutter speed, it's on Auto so it could be anything the camera chooses. Perhaps someone could confirm this?

Thats my understanding about shutter off in most cameras. You are actually putting it in auto mode.

No, that is incorrect.
If you turn off the shutter, then it defaults to whatever the frame rate is.
For example, 1/30 for 30P, 1/24 for 24P, etc.

MASTERING THE CANON XF305 & XF300 CAMCORDERS (http://www.vortexmedia.com/DVD_XF305.html)

Hope that helps.

I stand corrected.

When shutter is off, it is off. I recently shot some fast action sport with it switched off and there was no motion judder or lag.

There is really no such thing as shutter "off" on a video camera even though there is a switch on the side of the camera says "off". Shutter is always being used. As I said before, when the shutter switch is in the off position then the shutter speed defaults to whatever the frame rate is. You can call that "off" if you want to, but there is still an electronic shutter being used at all times.

When shutter is off, it is off. I recently shot some fast action sport with it switched off and there was no motion judder or lag.

I don't know what you mean by "motion judder or lag", but there had to be plenty of motion blur in every frame you shot. You may not have minded it, and it may have looked okay to you, but I guarantee that the motion blur was there nevertheless.

With the shutter off, the speed is going to be 1/24, 1/30, or 1/25. There is no way you can shoot fast action sports at those shutter speeds and not get blur. Anyone who has shot sports photos with a still camera would agree there is blur at slow shutter speeds. In fact, I won't even use those shutter speeds for talking heads or interviews. In my opinion, Shutter Off is too slow for anything that has motion it it.

I don't know what you mean by "motion judder or lag", but there had to be plenty of motion blur in every frame you shot.
NO there was not

Interesting. I'd love to see a still frame.

So would I. There is no way you can shoot action sports with a shutter under 1/25th and not get motion blur. It is simple physics. Let's see some clips.

If he is shooting 60i interlaced then shutter off is 1/60th, perfectly reasonable for action shooting.

Interesting. I'd love to see a still frame.

I am unable due to copyright.I guess you'll have to take my word for it.

If he is shooting 60i interlaced then shutter off is 1/60th, perfectly reasonable for action shooting.

I shot 720 50p

Wow Jim & Doug, no reply with even a little apology? Not a big deal but seems kind of harsh and non-DVInfo like to call somebody out when it is your oversight.

An apology for what? Anyone with any experience knows that when shooting fast action sports you WILL see motion blur even at 1/60th or 1/50th of a second. Why do you think (still) sports photographers shoot action sports at 1/1000 or more? I'm not advocating that kind of fast shutter speed for video (because some motion blur is needed) but it is foolish to pretend there isn't motion blur at all at 1/60th of 1/50th.

So what more is there to be said when somebody isn't willing or isn't allowed to post an example to back up their claims? I have better things to do with my time than bicker back and forth. Other people are certainly free to post whatever what they want to, but there is no apology necessary. You have made the mistake of assuming that just because somone doesn't want to bother continuing the conversation that it must be an admission that something was posted that was not correct. That's your mistake. I stand by every word I have written on this thread -- 100%.