What causes this?

[equinefotography]

Hello all...I am new to this forum but have been enjoying the newsletter for months. I am hoping that someone can help me with this issue. I have no idea what to call it, hence my lack of a descriptive thread title and utter failure when searching for answers in forums and on google.

I've attached an example...it seems the white fence has "transferred" a reflection of sorts onto the horse and anything in front of the fence. The transfer is blue. How can I avoid this? Any ideas?? This was a VERY bright, cool day. I was shooting using my D70 with a polarizing filter and hood, ISO 200, WB sunny, and the EXIF is as follows: f/4.1, 1/640, Aperture priority mode @ 122mm.

Any and all ideas are appreciated immensely!! The blue isn't hugely noticeable on this background but my client has ordered a background swap and it looks TERRIBLE with the fence removed.

Thank you,
Jaime

[codewarrior00007]

Only thing that comes to my mind is to fix it by cloning in PS.

[equinefotography]

Well I can tediously fix some of it in PS as you say but I'm really interested in preventing it next time if I can. I shoot events in this arena many times this year. I'm thinking it's a lighting issue since it's just the white (even the white on the horse glows blue a little) but I'm not sure. Thank you for your response!

[i speak in math]

purple fringing -- mostly a characteristic of cheap lenses but can be exacerbated by certain sensors. Also, this doesn't really belong in the lighting section.

[geekgirl415]

That problem drove me crazy on my last vacation... this is what i found - Purple Fringing.

Commonly advocated methods of avoiding purple fringing include:

From Wiki- mitigations:

Avoid shooting with a wide-open lens in high contrast scenes.
Avoid overexposing highlights (e.g. specular reflections and bright sky behind dark objects).
Shoot with a Haze-2A or other strong UV-cut filter.[2]
Post-processing to remove purple fringing (or chromatic aberration in general) usually involves scaling the fringed colour channel, or subtracting some of a scaled version of the blue channel.[3]

I haven't actually experimented with any of these but I feel your pain!

[equinefotography]

Thanks to both! I will do more research now that I know what to look for. And as for being in the wrong section...I was GUESSING that sunlight was causing this but didn't know, as I said in the OP, but where should it be now that I have a name for my problem? Also I was shooting with a Nikkor 70-300mm lens...is that a "cheap" lens? Thanks!