Alley in Pisa, Italy

by Lars Kotthoff

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I own a Canon Rebel T1i, and when I try to record video, there are two dark spots on the screen. These do not appear when I take photos.

Video (spots in center and right center):

Video

Photo:

Photo

  1. Does the video mode use a different sensor than the photo modes?
  2. How do I fix this?
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Your samples are broken. –  Itai May 18 '11 at 20:22
    
Should be fixed. –  y0mbo May 18 '11 at 20:25

1 Answer 1

up vote 6 down vote accepted

That looks like dust on the sensor.

Dust is more visible at small apertures and becomes mostly invisible at wide apertures. So it is just that your photo was taken at a wider aperture compared to the video. You can easily confirm this by taking a shot in Aperture priority mode (A) and setting a small aperture (say F/22). The dust should appear again and you should go have your sensor cleaned.

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@y0mbo - take a look at photo.stackexchange.com/questions/12087/…. –  ysap May 18 '11 at 21:42
    
Yep, looks like dust to me too. –  John Cavan May 19 '11 at 1:48
    
I do not understand how aperture size can possibly affect how dust on the sensor appears. It will affect the appearance of dust on the lens, of course, but on the sensor it's basically shadowing the light. It makes no difference how the light got there because the dust is directly on the sensor. –  whuber May 19 '11 at 2:38
1  
@whuber: look at jrista's answer to the question @ysap linked. The short answer is that dust doesn't get on the sensor proper, but on the front of the filters (and such) a few millimeters in front of the sensor. –  Jerry Coffin May 19 '11 at 3:54
    
@Jerry Thanks. That makes good sense. I did not realize the filters were at such a (relatively large) distance from the sensor. –  whuber May 19 '11 at 14:24

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