Bald Eagle

[Bill Dix]

Conowingo Dam, last Friday. I love the variation in the feather colors. C&C appreciated.

D7000, 500f4 + 1.4, ISO 1000, 1/2000s @ f/7.1, +1.7 EV, tripod and mongoose

[gail bisson]

Very nice wing position and I like the feather details as well. There is something wonky on the leading edge of the bird's right wing ( looks like dark purple line). What is it?
Gail

[Bill Dix]

Very nice wing position and I like the feather details as well. There is something wonky on the leading edge of the bird's right wing ( looks like dark purple line). What is it?
Gail

Hi Gail. I can see it in the RAW file when I blow it up, so it's not a PP issue. Don't know what causes it, but I've seen something similar in other images. I can only guess that it's some sort of optical aberration caused by the slightly oof shadowed edge of the wing against the brighter blue sky.

[Doug Brown]

Sharpness and wing position are excellent. Your exposure is pretty good. I do wish for more eye contact with the subject. I believe that what you are seeing on the leading edge of the far wing is chromatic aberration, also known as purple fringing. Here's a link to Wikipedia's discussion on chromatic aberration.

[Jonathan Ashton]

Beautiful image, lovely detail and exposure, the head angle isn't perfect but that does not per tub me one bit. I suspect the chromatic aberration was probably induced by the TC.

[Bill Dix]

Sharpness and wing position are excellent. Your exposure is pretty good. I do wish for more eye contact with the subject. I believe that what you are seeing on the leading edge of the far wing is chromatic aberration, also known as purple fringing. Here's a link to Wikipedia's discussion on chromatic aberration.

Thank you Doug. The article is interesting. I suspected it was something like that, but I hadn't really understood the physics of it. I guess I hadn't scrutinized the OP enough to see it (thanks, Gail, for pointing it out). Here's a repost where I've removed at least some of it by simple cloning along the leading wing edge. I'll explore the Nikon software to see if there is a way I could have done it in PP, although the article suggests this type of purple fringing is difficult to take out in PP. Maybe that's the price I paid for buying the Kenko TC?

[Kaustubh Deshpande]

Bill, kenko TC does create more CA than a canon one. In DPP, there is a way to take care of it...not sure about Nikon software.

nice details and DOF. liked the underwing details that you got without blowing the whites. The angle is a little too steep for my liking.

[Bill Dix]

Thank you all for the helpful comments. I tried Nikon's View NX2, which has a CA correction feature that doesn't seem to be very effective. ACR also has such a feature -- it doesn't really get rid of the fringe, but allows you to shift the color from purple more toward the color of the sky, which helps make it less obvious. I'll try to be more aware of the CA from here on. Learn something every day.