Dust spots on my pictures

futureal33

futureal33

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Name
Nick
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Yes
Hi,

I went out last night with 2 of my lenses and noticed that when I got in several of the images had dark dust spots dotted across the image!
I was shooting at around F20 which is when the spots appear, anything less and they dont.

Are these spots likely to be dust on the camera's sensor, or inside the lens itself? I have cleaned both ends of the lens and the spots still appear on photos.

Thanks
 
Actually, shooting at f/20 on a 40D is pretty extreme. It would be a pretty exceptional situation to warrant stopping down beyond f/16, or even f/11.

Before trying wet solutions I'd suggest a rocket blower as a first course of action. Either that or stop stopping down so much.
 
You have dirt on the sensor.

Been there, done that, had the blobs all over an entire set of 750 photographs taken on holiday, had to spend ages cloneing them out. Not fun...

Its particularly obvious if you rapidly flick between pictures - don't get confused by dirt on your monitor though! (spot this by dragging the window about...)

The biggest culprit is pollen - changing lenses outdoors in spring is deadly.

Wet cleaning is the ultimate, but not often necessary, what you need is (small fanfare please...) an Artic Butterfly.
 
I was shooting at F20 because I wanted to keep the shutter open as long as possible in the absence of an ND filter, all other settings were at the lowest possible to get shutter speed extended so F20 was necessary :(
Im thinking though that under normal circumstances, ie 99%+ of the time I would be at no higher than F11 that these small specks of dust wont really be an issue - unless they get worse of course!!
Thanks for the help :)
 
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