Slow Motion at DVinfo.net

Michael Stewart · January 28th, 2008, 11:44 PM

I'm shooting 24p and want to slow the footage down to 50 percent not 40, so I set shutter at 48, but it seems strobe like anyone have a clue why?

Thanks
Mike

Eric Pascarelli · January 28th, 2008, 11:47 PM

Did you set it to 48 on the S&Q menu?

How's your shutter set? Try setting it to angle mode at 180°

Describe the strobing, or post a small quicktime, if you can.

Sami Sanpakkila · January 29th, 2008, 06:04 AM

Are you shooting indoors or outdoors? Fluorescent lights could cause that as well. It happens to me indoors if I shoot at 60fps. 50fps has no strobing.

Evan Donn · January 29th, 2008, 01:15 PM

shutter speed or frame rate? If you want to shoot 50% slow motion you need to shoot at 48 frames per second, not a 1/48 shutter speed. I'm not sure if 48 fps is an option on the EX.

Eric Pascarelli · January 29th, 2008, 01:21 PM

48fps is an option on the EX1, but only at 720p. It's selected on the S&Q menu.

Michael Stewart · January 29th, 2008, 05:47 PM

Sorry, just got home. I am shooting 48fps SQ mode, 720 24p, indoors. There were flourescent lights.

Mike

Eric Pascarelli · January 29th, 2008, 05:53 PM

Fluorescents will flicker at 48 fps. at 180° (1/96 sec) shutter or no shutter (1/48 sec). Try 1/60 shutter.

Michael Stewart · January 29th, 2008, 09:09 PM

Thanks Eric, I'll try it.

Mike

Craig Seeman · January 30th, 2008, 07:34 AM

I wonder if Flicker Reduce menu setting would have impact. One might think that it's function is to reduce flicker when shooting at NTSC frame rates in PAL regions (50Hz electrical actually) and vice versa. What it's actually doing (since it's not changing the shutter speed) is a minor mystery to me. One might think it can help fluorescent light flicker.

January 28th, 2008, 11:44 PM	#1
Michael Stewart Major Player Join Date: Jun 2003 Location: Spokane, Wa. Posts: 445	Slow Motion I'm shooting 24p and want to slow the footage down to 50 percent not 40, so I set shutter at 48, but it seems strobe like anyone have a clue why? Thanks Mike

January 29th, 2008, 01:15 PM	#4
Evan Donn Major Player Join Date: Feb 2006 Location: Philadelphia Posts: 795	shutter speed or frame rate? If you want to shoot 50% slow motion you need to shoot at 48 frames per second, not a 1/48 shutter speed. I'm not sure if 48 fps is an option on the EX. __________________ My latest short documentary: "Four Pauls: Bring the Hat Back!"

January 28th, 2008, 11:47 PM	#2
Eric Pascarelli Major Player Join Date: Nov 2007 Location: Los Angeles, CA Posts: 498	Did you set it to 48 on the S&Q menu? How's your shutter set? Try setting it to angle mode at 180° Describe the strobing, or post a small quicktime, if you can.

January 29th, 2008, 06:04 AM	#3
Sami Sanpakkila Major Player Join Date: Nov 2007 Location: Finland Posts: 317	Are you shooting indoors or outdoors? Fluorescent lights could cause that as well. It happens to me indoors if I shoot at 60fps. 50fps has no strobing.

January 29th, 2008, 01:21 PM	#5
Eric Pascarelli Major Player Join Date: Nov 2007 Location: Los Angeles, CA Posts: 498	48fps is an option on the EX1, but only at 720p. It's selected on the S&Q menu.

January 29th, 2008, 05:47 PM	#6
Michael Stewart Major Player Join Date: Jun 2003 Location: Spokane, Wa. Posts: 445	Sorry, just got home. I am shooting 48fps SQ mode, 720 24p, indoors. There were flourescent lights. Mike

January 29th, 2008, 05:53 PM	#7
Eric Pascarelli Major Player Join Date: Nov 2007 Location: Los Angeles, CA Posts: 498	Fluorescents will flicker at 48 fps. at 180° (1/96 sec) shutter or no shutter (1/48 sec). Try 1/60 shutter.

January 29th, 2008, 09:09 PM	#8
Michael Stewart Major Player Join Date: Jun 2003 Location: Spokane, Wa. Posts: 445	Thanks Eric, I'll try it. Mike

January 30th, 2008, 07:34 AM	#9
Craig Seeman Inner Circle Join Date: Feb 2004 Location: Brooklyn, NY, USA Posts: 3,841	I wonder if Flicker Reduce menu setting would have impact. One might think that it's function is to reduce flicker when shooting at NTSC frame rates in PAL regions (50Hz electrical actually) and vice versa. What it's actually doing (since it's not changing the shutter speed) is a minor mystery to me. One might think it can help fluorescent light flicker.