<p>As Itai indicated, there are a couple of possible questions here.  CRT (picture tube) video devices paint images on their screens using an electron "gun" that scans left-to-right and top-to-bottom.  Photos taken with a fast shutter speed will catch a display like this in mid-paint, showing recently-painted lines brightly, with a darker area just below them (about to be refreshed).  Although LCD screens also have a "refresh rate", you don't see the same kind of dimming between pixel painting, so this type of problem is much more subtle (you can still catch a picture in mid-paint, but it's just based on movement in the video).  I used to have a Ricoh SLR with a "video" setting designed specifically to keep the shutter slow enough to avoid this effect when shooting a CRT.  Quaint, huh?</p>

<p>If, on the other hand, you're talking about the "<a href="http://en.wikipedia.org/wiki/Rolling_shutter" rel="nofollow noreferrer">rolling shutter</a>" <a href="http://vimeo.com/6894404" rel="nofollow noreferrer">video effect</a> seen to some extent on most CMOS DSLR's, we're staying clear of video questions here, but you might have some luck with this on <a href="https://video.stackexchange.com/">avp.stackexchange.com/</a>.</p>

CC BY-SA 3.0
2011-07-08T17:08:34.217Z
2011-07-08T17:08:34.217Z
2017-04-12T07:32:19.270Z
D. Lambert
<p>I am trying to understand if there is any relation between Exposure(Manual/Auto) function of a Camera and Flicker effect that might be visible in a video shot by that camera?</p>

<p>If one has to do flicker removal, does it have any commonality with the Auto exposure parameters like Exposure time, exposure gain? Can those parameters in anyway tuned/changed to remvoe flicker effect?</p>

CC BY-SA 3.0
2011-07-09T18:45:27.550Z
Can you provide more detail on exactly what is flickering for you, and under what circumstances?  The techniques to control different kinds of flicker (e.g. fluorescent lights, CRTs) depend heavily on what you're experiencing flicker with.
Clint Torres
<dslr>
Is there any relation between a Exposure & Flicker 
goldenmean
# Is there any relation between a Exposure & Flicker 

(Asked by: username_0 on 2011-07-08)

I am trying to understand if there is any relation between Exposure(Manual/Auto) function of a Camera and Flicker effect that might be visible in a video shot by that camera?

If one has to do flicker removal, does it have any commonality with the Auto exposure parameters like Exposure time, exposure gain? Can those parameters in anyway tuned/changed to remvoe flicker effect?

**Tags:** dslr

> **Comments:**
> **username_1**: Can you provide more detail on exactly what is flickering for you, and under what circumstances?  The techniques to control different kinds of flicker (e.g. fluorescent lights, CRTs) depend heavily on what you're experiencing flicker with.  

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## 1 answers

### Answer by username_2 on 2011-07-08. Score: 0

As Itai indicated, there are a couple of possible questions here. CRT (picture tube) video devices paint images on their screens using an electron "gun" that scans left-to-right and top-to-bottom. Photos taken with a fast shutter speed will catch a display like this in mid-paint, showing recently-painted lines brightly, with a darker area just below them (about to be refreshed). Although LCD screens also have a "refresh rate", you don't see the same kind of dimming between pixel painting, so this type of problem is much more subtle (you can still catch a picture in mid-paint, but it's just based on movement in the video). I used to have a Ricoh SLR with a "video" setting designed specifically to keep the shutter slow enough to avoid this effect when shooting a CRT. Quaint, huh?

If, on the other hand, you're talking about the "[rolling shutter](http://en.wikipedia.org/wiki/Rolling_shutter)" [video effect](http://vimeo.com/6894404) seen to some extent on most CMOS DSLR's, we're staying clear of video questions here, but you might have some luck with this on [avp.stackexchange.com/](https://video.stackexchange.com/).


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