Frames get duplicated.

Tom's right. But since it's an interlaced camera you also take a resolution hit. If the shutter is open for 1/30th sec then the same data is written to each 60i field and you lose 50% of your resolution. If you're shooting standard definition or downconverting and capturing as regular DV this shouldn't be much of a problem however. There are 1080 lines to start with, so chopping that down to 540 still gives you plenty for a 480 line DV image.

Interesting. I was thinking of it like film through the gate which would limit the density possible from exposure. I'll have to play around with that a bit.

I'm sorry - that should have been attributed to Ian!

Easy. Select shutter speed and turn the dial to give you the speed you'd like. From 1/3rd sec to 1/10,000th sec, the choice is yours.

It's interesting that in Avid, if I step through footage I shot at 1/30 field by field, I do indeed see that the same data is written to each field, but I can also see the entire field move up and down a scan line when I toggle back and forth. I would think this gives a one scan line vertical blur.

Or am I just off my rocker?