24p-180degree shutter
by MarkD
on
Nov 21, 2007 at 3:04:37 pm
Our HDX900 has a shutter setting for "half". Would someone please explain the practicle value of using this? Also, when I set the camera to 24p does it automatically set the shutter to 180 degrees?
I appreciate any advice anyone can offer.
Re: 24p-180degree shutter by evanmcintosh on Nov 21, 2007 at 5:48:21 pm
The HALF setting is synonymous with a 180 degree shutter--and is thus a very useful feature. Exposure time is half the reciprocal of fps, so at 24fps HALF yields a 1/48 shutter, at 60fps HALF yields a 1/120 shutter.
If you have the shutter turned off in 24p, then the exposure time will be 1/24 of a second (360 degree) which gives you way too much motion blur for most circumstances.
Evan McIntosh
McIntosh Productions LLC
Atlanta, GA
HDX900 owner/operator
Re: 24p-180degree shutter by santellavision on Nov 21, 2007 at 6:18:13 pm
Definitely use the half-shutter when shooting 24. Without it, you get way too much blur. True film cameras do the same thing as the mirror rotates when exposing.
I also use half when shooting 30 fps if you are getting too much blur. It also helps tremendously when you shoot blue screen.
Re: 24p-180degree shutter by MarkD on Nov 21, 2007 at 7:46:21 pm
Evan and Santellavision,
Great answers. Thanks for responding so quickly. We shoot a lot of 16mm so I understand the relationships. Knowing that turning on the shutter to half will reduce blur is great info! I'll definitely test this one out.
Thanks again!
Mark
