FX1 iris controls... not a happy customer

Ian Holb · August 30th, 2007, 05:00 PM

Frames get duplicated.

Boyd Ostroff · August 30th, 2007, 05:24 PM

Quote:

Originally Posted by Jim Michael

How can your shutter speed be slower than your frame rate?

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.

Jim Michael · August 30th, 2007, 07:11 PM

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.

Boyd Ostroff · August 30th, 2007, 07:29 PM

Quote:

Originally Posted by Boyd Ostroff

Tom's right.

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

Tom Hardwick · August 31st, 2007, 01:25 AM

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.

Vito DeFilippo · August 31st, 2007, 09:26 AM

Quote:

Originally Posted by Boyd Ostroff

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.

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?

August 30th, 2007, 05:00 PM	#31
Ian Holb Regular Crew Join Date: Nov 2006 Location: Canada Posts: 127	Frames get duplicated.

August 30th, 2007, 07:11 PM	#33
Jim Michael Major Player Join Date: Dec 2005 Posts: 895	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.

August 31st, 2007, 01:25 AM	#35
Tom Hardwick Inner Circle Join Date: Mar 2003 Location: Billericay, England UK Posts: 4,711	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.