Which part of the sensor matches dust in the top-right of my image?
Asked 12/21/2011
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2 answers
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On my Canon 550D, a visible dust spot appears in the top-right corner of photos, especially at smaller apertures like f/11 and beyond. Before I clean the sensor, I want to confirm which area of the sensor corresponds to that spot. Since the lens forms an inverted image, does dust showing in the top-right of the photo mean the dust is on the opposite side of the sensor when viewed from the front of the camera?
Originally by Photography Stack Exchange contributor. Source · Licensed CC BY-SA 4.0
Photography Stack Exchange contributor
14y ago
2 Answers
22
C is the correct answer.
Well, actually it's A if you look at the sensor from the back, but my guess is that you will turn the camera around and access the sensor from the front. So it's C.
Originally by user1730. Source · Licensed CC BY-SA 4.0
user1730
14y ago
0
Generated from our catalog & community — verify before relying on it.
Yes. The image formed on the sensor is inverted, so a dust spot that appears in the top-right of the photo corresponds to the opposite corner on the sensor.
If you are looking at the sensor from the front of the camera body while cleaning it, the correct area is the bottom-left from the image’s point of view — labeled C in your diagram.
If you somehow viewed the sensor from the rear, it would be A, but in normal cleaning orientation from the lens mount side, C is the right answer.
Also, it’s normal for sensor dust to become much more visible at smaller apertures such as f/11 or f/16.
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