CA

[aam1234]

Do you think a circular polarizer will reduce Chromatic aberration. (waw, can't believe I wrote that sentence).

I often shoot in bright sun and get quite a bit of CA in the photos.

Thanks

[Jon]

No. Chromatic aberration is caused by the glass bending the different wavelengths of light different amounts. But if your lens has chromatic aberration, it should be consistent. If you mean lens flare (hex-shaped images coming out of the sun or bright spots in the image), no, again - they're really reflections on the surfaces of your lens elements, and a good lens hood is the solution for them (plus not shooting into the sun).

[aam1234]

Thanks Jon,

It's not glass flare. See, I've been shooting boats & jet skis quite a bit lately. The metal rails of a boat will shine a purple color, or a white T-shirt of a jet skier. it's not very serious, but a bit annoying.

Wonder how to reduce it.

Thanks again

[Jon]

The dreaded purple fringe, maybe? IIRC it's worst on over-loaded sensor cells. Maybe shooting raw, and using the extra dynamic range you can get that way, you can cut it back. I do know polarizers won't affect metallic reflections.

[aam1234]

Yes! purple fringe. Excuse my ignorance of terminology (I wonder what's CA then).

If shooting raw is the answer, then I'm out of luck. I'm a die hard jpeg fan.

Thanks again

[Jon]

Chromatic abberation is caused by glass refracting different wavelengths (colours) of light different amounts. Sort of like a prism. Through careful choice of glasses and lens shapes, designers try to minimize this, but it'll show up as a fringe around objects (not necessarily bright ones) of red or blue, depending on what colour was less fully corrected.

[aam1234]

WAW Jon, you seem an expert in that subject. Thanks for the info.