Why when i shoot 30f or 24f i feel like the footage is Strobing, Flashes at DVinfo.net

Arthur Abramov · October 9th, 2009, 03:09 AM

do you know what i mean?

its like strobe light hits the screen, not clear like film, does it have to do with my shutter speed or the frame rate?

Tripp Woelfel · October 10th, 2009, 07:11 AM

If I shift the camera from 60i to 24f, it does look as you describe. I don't know if it's just my not being used to the cadence of 24f, the way that the Canon displays the 24f image on the LCD and viewfiender or both. Viewed in the edit suite and in the finished product, 24f looks fine and no strobing is evident.

I wouldn't worry about it. I think it's most evident when shifting from 60i to 24f. I think it takes my eyes a while to get used to it, but like everything else about me my eyes are old and slow.

Mark Barbieri · October 11th, 2009, 04:35 PM

I get that effect when I use a fast shutter speed. I get the best results when I use a shutter speed of 1/60 for 30f. I think using a shutter speed faster than half the frame rate leads to the strobe effect.

Arthur Abramov · October 14th, 2009, 03:05 PM

a day ago i was shooting a Birthday in a hall , i was experiencing something rather weired, i was on sd 3:4,16:9 ratio and HDV at 60i , and i was under flourecent light, and guess what i was getting? real flashes strobing at 1/30 shutter Speed up untill 1/100 it stopped, one step up on the shutter speed the flashes strobe faster, unbelievable, when i went out it didn't strobe much because the light is a regular bulb , no problem either kind of speed.

what is the matter with the camera.? do u guys get the same thing?

share with me.

Jonathan Shaw · October 14th, 2009, 04:33 PM

The strobing on 24 and 30p, is it on the LCD or when you view the footage after? For me 25p looks crappy on the lcd but can look great on a HDTV.

Can you post examples of the footage and we will try and figure it out. Doesn't sound like a camera fault.

Jon

Tripp Woelfel · October 14th, 2009, 06:08 PM

Quote:

Originally Posted by Arthur Abramov

what is the matter with the camera.? do u guys get the same thing?

Unlikely. Could be weird or cheap lights, or something weird with the camera.

A 1/60 shutter should work in complete sync with the US power grid since it's 60Hz or cycles. Increasing the shutter speed to 1/100 would likely make things worse since 100 is not divisible by 60. 1/30 might be a better option, but there are other potential issues.

Arthur Abramov · October 16th, 2009, 11:19 AM

So i guess i need to set it up to 50Hz because i'm in Europe with an NTSC camera.?

how do i set it up?

Jack Walker · October 16th, 2009, 02:27 PM

If you are shooting NTSC 60i in Europe, set your shutter speed to 1/100 to eliminate catching cycling from light sources.

Arthur Abramov · October 17th, 2009, 12:27 PM

May be i could play around with the Clear Scan Function..?

anyway i tried but it starts from 60.01hz anyway i think i'll upgrade it to Pal and i won't have any problems.

October 9th, 2009, 03:09 AM	#1
Arthur Abramov Regular Crew Join Date: Dec 2008 Location: new york, Israel Posts: 136	Why when i shoot 30f or 24f i feel like the footage is Strobing, Flashes do you know what i mean? its like strobe light hits the screen, not clear like film, does it have to do with my shutter speed or the frame rate?

October 14th, 2009, 03:05 PM	#4
Arthur Abramov Regular Crew Join Date: Dec 2008 Location: new york, Israel Posts: 136	Another revalation today a day ago i was shooting a Birthday in a hall , i was experiencing something rather weired, i was on sd 3:4,16:9 ratio and HDV at 60i , and i was under flourecent light, and guess what i was getting? real flashes strobing at 1/30 shutter Speed up untill 1/100 it stopped, one step up on the shutter speed the flashes strobe faster, unbelievable, when i went out it didn't strobe much because the light is a regular bulb , no problem either kind of speed. what is the matter with the camera.? do u guys get the same thing? share with me.

October 14th, 2009, 04:33 PM	#5
Jonathan Shaw Major Player Join Date: Nov 2007 Location: Sydney Posts: 552	The strobing on 24 and 30p, is it on the LCD or when you view the footage after? For me 25p looks crappy on the lcd but can look great on a HDTV. Can you post examples of the footage and we will try and figure it out. Doesn't sound like a camera fault. Jon __________________ www.ginclearfilm.com www.facebook.com/ginclearfilm

October 10th, 2009, 07:11 AM	#2
Tripp Woelfel Trustee Join Date: Jan 2008 Location: North Conway, NH Posts: 1,745	If I shift the camera from 60i to 24f, it does look as you describe. I don't know if it's just my not being used to the cadence of 24f, the way that the Canon displays the 24f image on the LCD and viewfiender or both. Viewed in the edit suite and in the finished product, 24f looks fine and no strobing is evident. I wouldn't worry about it. I think it's most evident when shifting from 60i to 24f. I think it takes my eyes a while to get used to it, but like everything else about me my eyes are old and slow.

October 11th, 2009, 04:35 PM	#3
Mark Barbieri Tourist Join Date: Oct 2009 Location: The Woodlands, TX Posts: 2	I get that effect when I use a fast shutter speed. I get the best results when I use a shutter speed of 1/60 for 30f. I think using a shutter speed faster than half the frame rate leads to the strobe effect.

October 16th, 2009, 11:19 AM	#7
Arthur Abramov Regular Crew Join Date: Dec 2008 Location: new york, Israel Posts: 136	So i guess i need to set it up to 50Hz because i'm in Europe with an NTSC camera.? how do i set it up?

October 16th, 2009, 02:27 PM	#8
Jack Walker Trustee Join Date: Jun 2006 Location: Burbank Posts: 1,811	If you are shooting NTSC 60i in Europe, set your shutter speed to 1/100 to eliminate catching cycling from light sources.

October 17th, 2009, 12:27 PM	#9
Arthur Abramov Regular Crew Join Date: Dec 2008 Location: new york, Israel Posts: 136	May be i could play around with the Clear Scan Function..? anyway i tried but it starts from 60.01hz anyway i think i'll upgrade it to Pal and i won't have any problems.