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I don't think the only potential problem here is the 100-400, use of filters, or lack of lens hoods. On my last two trips I've had images with ghosting like this from both the 400 f5.6 and 500 f4L IS--no filters (other than the one built in to the 500), lens hoods always used. I discussed it with Canon yesterday, and it sounded as if they've had other ghosting reports. The technician I spoke with mentioned reflections from water as a possible factor, and indeed, the images where I've noticed ghosting (mostly flights shots) were all shot from a shore or ship. Since at least two lenses were affected, I suspect the camera (1Ds mark III). I sent a sample image, hope to know more today.
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Roger, If I knew as much as you do about photography I think that I would have a headache all the time.... Killer image BTW. Thanks to Jay for posting it for us lazy folks.
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Artie,
Hey now, wait a minute. We all have knowledge in some areas, and not so much in others. My field is planetary science -- that means I know a little bit about a lot of stuff but not as much depth as anyone in a specific field. Dedicated astrophotographers run circles around me with their astro images, just as the dedicated bird photographers here, including you, run circles around me with bird images.
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