Circular spots on images with Canon 500mm f4.0 IS

Started Jul 18, 2012 | Discussions thread
liquidstone Forum Pro • Posts: 10,057
Dust on the sensor, visible at small aperures

Just curious, why f/16 and ISO 1000?

wdcarrier wrote:

I am experiencing spots on my digital images, especially in light areas (see above bird's head and to left of body). I have cleaned the objective lens and blown out the barrel but continue to get them. Can anyone tell me what is causing this and how to correct it?

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PHILIPPINE WILD BIRDS (Over 260 species captured in habitat, and counting.)

Long Lens Imaging (1000 mm and beyond)

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