Sensor dust showing up with closed off aperture?

1 month 1 week ago #663930 by Farestad
Do you find that sensor dust shows up more in smaller apertures more than wide apertures?   I just noticed that for me, at smaller apertures like f16+, I see more dust spots.  

Is that what you have experienced? 

EF 50mm f/1.4
EF 35mm f/1.4L USM
EF 100mm f/2
EF 70-200mm f/4
EF 18-55mm
EF 85mm f/1.8 USM

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1 month 1 week ago #663945 by effron
Yes, a stopped down lens will reveal those dusties better.

Why so serious?
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1 month 1 week ago #663952 by garyrhook
Here's the procedure to see how dirty your sensor is:

1) You need a brightly lit piece of paper, or perhaps the sky. A single color is easier to work with.
2) Stop the lens down as far as it will go. f/22 would be good.
3) Manual focus and blur the image as much as possible.
4) Take a shot.
5) Examine said image. Any spots will show up.

Step 2 is relevant to your question. Stopping down, as well as areas of (mostly) solid color, will reveal spots.


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1 month 1 week ago #663959 by Farestad
Ha!  I know what I'l be doing this weekend.  Thanks for the tips, I had no idea, but will try this method out. 

EF 50mm f/1.4
EF 35mm f/1.4L USM
EF 100mm f/2
EF 70-200mm f/4
EF 18-55mm
EF 85mm f/1.8 USM

Photo Comments

Please Log in or Create an account to join the conversation.

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