Help. What would be causing this?

[mcdesign]

I have got a lot of colour fringing with my Nikon 70-300 mm lens today, EXIF is 1/320s @ f/5.6, focal length 300 mm, ISO 500 (to get a faster shuuter speed?) I haven't had this problem before, is it to do with the ISO?

[DzRbenson]

I would say a combination of ISO and speed.

[ving]

is it the af-d or af-s version of the lens? CA can be reduced with good coatings on lens glass. if lens coatings arent up to scratch then you get CA.

http://en.wikipedia.org/wiki/Chromatic_aberration

some astronomers use a minus violet filter to remove this, but i dont know what to do with a photographic lens.

[mcdesign]

David it is the AF 70-300 1:4-5.6 G, plastic model, I suspect I made a boo boo on buying this lens, didn't know much about them until I started to look at images on AP and the lenses they are taken with, I find it pretty soft too, than G for Photoshop! Margaret

[Slide]

What you can do is, in PS open HSL and drop the magenta, and similar colours, back to desaturate. If it wipes out other parts of you photo that you don't want messed with just apply a mask, invert and brush the areas you want fixed.