Shooting 1080p25 and the Shutter? at DVinfo.net

Richard Gillespie · October 3rd, 2007, 09:06 AM

Am I right in thinking that when shooting on the F330/350 in 1080p25 it would be correct to have the shutter on the camera at a 1/50th? Or is the camera default correct? To me the camera default seems more like 1/25th.

Thanks in advance,

Simon Wyndham · October 3rd, 2007, 09:33 AM

Richard, you are correct. In 25p mode you need to switch the shutter on to 1/50th otherwise you will get the equivalent of a 1/25th shutter which will smear the motion.

Richard Gillespie · October 3rd, 2007, 12:11 PM

Thanks for sharing your knowledge Simon, much appreciated.

Kalunga Lima · October 4th, 2007, 12:58 PM

On my F350, the default shutter setting in 1080/25p HQ HD is 1/50, in fact I don't even think there is 1/25th available.

best of luck

Simon Wyndham · October 4th, 2007, 03:15 PM

No. If the shutter switch is in the off position the shutter in 25p mode is 1/25th. You must switch the shutter switch on to obtain 1/50th.

Kalunga Lima · October 4th, 2007, 03:45 PM

Live and learn.
Thanks Simon

Max Bettelle · October 6th, 2007, 03:48 PM

Quote:

Originally Posted by Simon Wyndham

Richard, you are correct. In 25p mode you need to switch the shutter on to 1/50th otherwise you will get the equivalent of a 1/25th shutter which will smear the motion.

The shutter speed of a film camera at 24fps is normally set at 1/24 or at 1/48?
Maybe if we want to have the film look we should have the same setting also on HD cameras....

Alister Chapman · October 7th, 2007, 09:43 AM

The shutter speed for film is normally 24 frames per second. However most film camera shutters are not open for the full duration of that period. Most shutters are only open for 180 degrees. Most film cameras have a rotating shutter that also has a mirror or prism, while the shutter is closed the mirror directs the light from the lens into the viewfinder. As a result the effective amount of time the film is exposed is 50% of 24 frames per second (108 degrees being half of a full rotation of 360 degrees) which is 1/48th of a second.

If you shoot at 24p or 25p without turning on the shutter any movement will tend to blur and make you final pictures look a little soft. If your shooting in low light sometimes you may want to use the full 25th of a second and live with a small amount of blur. However it is normal practice to use a 50th of a second shutter to simulate the 180 degree film shutter and to reduce blurring and softening. Going to a 100th of a second shutter can help to crispen up fast action but may introduce judder. It's all a bit of a trade off and best to experiment for yourself and work out what gives you the look you want. There is no right or wrong way, it depends on the look you are after.

October 3rd, 2007, 09:06 AM	#1
Richard Gillespie New Boot Join Date: Sep 2007 Location: London Posts: 24	Shooting 1080p25 and the Shutter? Am I right in thinking that when shooting on the F330/350 in 1080p25 it would be correct to have the shutter on the camera at a 1/50th? Or is the camera default correct? To me the camera default seems more like 1/25th. Thanks in advance,

October 4th, 2007, 12:58 PM	#4
Kalunga Lima Regular Crew Join Date: Jul 2004 Location: Luanda - ANGOLA & Lisbon - PORTUGAL Posts: 160	Shutter Default On my F350, the default shutter setting in 1080/25p HQ HD is 1/50, in fact I don't even think there is 1/25th available. best of luck __________________ Kalunga Lima PMW-350, PDW-F350, PDW-EX1, MacBookPro, MacPro 8-Core, Final Cut Studio 2, Canon 5D MkII

October 4th, 2007, 03:45 PM	#6
Kalunga Lima Regular Crew Join Date: Jul 2004 Location: Luanda - ANGOLA & Lisbon - PORTUGAL Posts: 160	Live and learn. Thanks Simon __________________ Kalunga Lima PMW-350, PDW-F350, PDW-EX1, MacBookPro, MacPro 8-Core, Final Cut Studio 2, Canon 5D MkII

October 7th, 2007, 09:43 AM	#8
Alister Chapman Inner Circle Join Date: Dec 2005 Location: Bracknell, Berkshire, UK Posts: 4,957	The shutter speed for film is normally 24 frames per second. However most film camera shutters are not open for the full duration of that period. Most shutters are only open for 180 degrees. Most film cameras have a rotating shutter that also has a mirror or prism, while the shutter is closed the mirror directs the light from the lens into the viewfinder. As a result the effective amount of time the film is exposed is 50% of 24 frames per second (108 degrees being half of a full rotation of 360 degrees) which is 1/48th of a second. If you shoot at 24p or 25p without turning on the shutter any movement will tend to blur and make you final pictures look a little soft. If your shooting in low light sometimes you may want to use the full 25th of a second and live with a small amount of blur. However it is normal practice to use a 50th of a second shutter to simulate the 180 degree film shutter and to reduce blurring and softening. Going to a 100th of a second shutter can help to crispen up fast action but may introduce judder. It's all a bit of a trade off and best to experiment for yourself and work out what gives you the look you want. There is no right or wrong way, it depends on the look you are after. __________________ Alister Chapman, Film-Maker/Stormchaser http://www.xdcam-user.com/alisters-blog/ My XDCAM site and blog. http://www.hurricane-rig.com

October 3rd, 2007, 09:33 AM	#2
Simon Wyndham Trustee Join Date: Dec 2003 Location: Malvern UK Posts: 1,931	Richard, you are correct. In 25p mode you need to switch the shutter on to 1/50th otherwise you will get the equivalent of a 1/25th shutter which will smear the motion.

October 3rd, 2007, 12:11 PM	#3
Richard Gillespie New Boot Join Date: Sep 2007 Location: London Posts: 24	Thanks for sharing your knowledge Simon, much appreciated.

October 4th, 2007, 03:15 PM	#5
Simon Wyndham Trustee Join Date: Dec 2003 Location: Malvern UK Posts: 1,931	No. If the shutter switch is in the off position the shutter in 25p mode is 1/25th. You must switch the shutter switch on to obtain 1/50th.