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Thanks for the ideas! The lens I used is a Canon Ultrasonic 75-300mm. It is an older lens (5 or 6 years old now?), one I got for my Canon 500N, but still quite serviceable. I've had a flick through other images I've taken with a high contrast or bright light scenario while using that lens and the problem is evident (to a lesser degree) in those images.
I tend to agree with chromatic abberation theory and will toddle off to a camera shop for a UV polarizing lens.
I'll also have a crack at changing the settings (exposure times, aperture etc.). I had been using the camera on automatic when I spotted the bird and wanted to snap off a few before it flew away. I should have realised it was going to be there for some time because it was drying its wings.
Peter.
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