Thresholds For the Rolling Shutter Effect? at DVinfo.net

Frank Howard · July 25th, 2007, 03:41 PM

I'm thinking of doing some Slo Mo work with A1U and was wondering at just what point does the rolling shutter effect kick in as far as shutter speeds and movement go.
For example, if I lock the fps down to 120 and have little if any camera movement (even though there is fast movement in the frame)... is it safe?

I know DSE has done a lot of work with the A1U and is extremely knowledgeable about the myths and realities regarding the rolling shutter effect, so I'm hoping he will chime in here.

Mikko Lopponen · July 29th, 2007, 03:37 PM

The effect is always there. It just shows up more with higher shutter speeds because there is no motion blur to hide the effect. Is it usuable will depend on the application.

Frank Howard · August 9th, 2007, 04:23 PM

Well I'm trying to get some basic useable parameters, as I have been thinking of doing some slo mo (not much but some with the A1U).

Mikko Lopponen · August 10th, 2007, 12:05 AM

Parameters? Well...it takes for the cmos to scan the image 1/60th of a second. The bottom part is 1/60th of a second later than the top.

Slow-mo work is trickier because a 50% slowmo will show the effect twice as hard. But it is possible to do slowmo shots if you just limit the movement of the camera itself.

I've done slowmo work with the HC1 and...well you just have to see it for yourself, it's very hard to describe the effect. You can make shots terrible or they can look very nice with no visible rolling shutter depending on how you shoot it. No rapid camera motions. That's a must for slow-mo work.

Here's a clip with some slow-motion shots with the hc1.

http://www.hmcindie.com/movies/Taikk...%20quality.wmv

Frank Howard · August 10th, 2007, 08:37 AM

Nice.
Well with the shutter speed set to 60, I have seen no evidence of the rolling shutter effect whatsoever. Maybe because I'm not a big fan of whip pans?

July 25th, 2007, 03:41 PM	#1
Frank Howard Regular Crew Join Date: Mar 2006 Location: Los Angeles, CA Posts: 157	Thresholds For the Rolling Shutter Effect? I'm thinking of doing some Slo Mo work with A1U and was wondering at just what point does the rolling shutter effect kick in as far as shutter speeds and movement go. For example, if I lock the fps down to 120 and have little if any camera movement (even though there is fast movement in the frame)... is it safe? I know DSE has done a lot of work with the A1U and is extremely knowledgeable about the myths and realities regarding the rolling shutter effect, so I'm hoping he will chime in here.

July 29th, 2007, 03:37 PM	#2
Mikko Lopponen Major Player Join Date: Mar 2006 Location: Helsinki, Finland Posts: 393	The effect is always there. It just shows up more with higher shutter speeds because there is no motion blur to hide the effect. Is it usuable will depend on the application.

August 9th, 2007, 04:23 PM	#3
Frank Howard Regular Crew Join Date: Mar 2006 Location: Los Angeles, CA Posts: 157	Well I'm trying to get some basic useable parameters, as I have been thinking of doing some slo mo (not much but some with the A1U).

August 10th, 2007, 12:05 AM	#4
Mikko Lopponen Major Player Join Date: Mar 2006 Location: Helsinki, Finland Posts: 393	Parameters? Well...it takes for the cmos to scan the image 1/60th of a second. The bottom part is 1/60th of a second later than the top. Slow-mo work is trickier because a 50% slowmo will show the effect twice as hard. But it is possible to do slowmo shots if you just limit the movement of the camera itself. I've done slowmo work with the HC1 and...well you just have to see it for yourself, it's very hard to describe the effect. You can make shots terrible or they can look very nice with no visible rolling shutter depending on how you shoot it. No rapid camera motions. That's a must for slow-mo work. Here's a clip with some slow-motion shots with the hc1. http://www.hmcindie.com/movies/Taikk...%20quality.wmv

August 10th, 2007, 08:37 AM	#5
Frank Howard Regular Crew Join Date: Mar 2006 Location: Los Angeles, CA Posts: 157	Nice. Well with the shutter speed set to 60, I have seen no evidence of the rolling shutter effect whatsoever. Maybe because I'm not a big fan of whip pans?