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Do you think my sensor might be dirty?
Lens: 10-20 Sigma F4-5.6 Camera: K-30 Photo Location: Crystal Cove, CA 
Posted By: rrstuff, 05-12-2014, 11:49 AM

F22, with sigma 10-20mm

Last edited by rrstuff; 10-27-2014 at 05:09 PM.
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05-12-2014, 12:12 PM - 1 Like   #2
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Definitely!
Besides all the spots it's a nice shot.
05-12-2014, 12:32 PM   #3
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Your being stopped down to f22 makes the dust spots stand out distinctly, and also, due to diffraction, your image not optimally sharp. You'd be better off shooting at ~f8 - f11 to benefit the most from your lens's optics.
05-12-2014, 12:33 PM   #4
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QuoteOriginally posted by johnyates Quote
Your being stopped down to f22 makes the dust spots stand out distinctly, and also, due to diffraction, your image not optimally sharp. You'd be better off shooting at ~f8 - f11 to benefit the most from your lens's optics.
I know. I stopped down to F22 due to desired shutter speed and lack of nd filters... I don't think at 0.7mpix resolution I will be hurt all that much from F22 .

05-12-2014, 12:36 PM - 1 Like   #5
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Ah! Makes sense.

Something I'm intending to try one day is to make up for the lack of a ND filter is to take a series of images and then stack them in software.
05-12-2014, 12:38 PM   #6
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QuoteOriginally posted by johnyates Quote
Ah! Makes sense.

Something I'm intending to try one day is to make up for the lack of a ND filter is to take a series of images and then stack them in software.
Ah yeah that's a fun technique, especially for a macro. I haven't tried that, mostly because I am worried there will be a bit of a shake in between each shot. What I want to try is one of those fancy macro rails .
05-12-2014, 03:39 PM   #7
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QuoteOriginally posted by rrstuff Quote
F22, with sigma 10-20mm
I also was going to say being at a high F number (like F22) will really show the dust on your sensor. If you take the same photo at lower F number many of these specs will disappear.

That being said, have you tried Giottos Rocket to blow off the sensor ?
05-12-2014, 04:31 PM   #8
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QuoteOriginally posted by Michael Piziak Quote
I also was going to say being at a high F number (like F22) will really show the dust on your sensor. If you take the same photo at lower F number many of these specs will disappear.

That being said, have you tried Giottos Rocket to blow off the sensor ?
Not for a while, but seems like i will have to.

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