whats wrong with my lens? purple -ish color?

[stir]

why is the reflection always purple-ish color?







here is a cropped picture of the problem.

im using a canon 20d with a 85mm 1.8 prime lens.

let me know if you guys need more information

[thelund]

why is the reflection always purple-ish color?

Looks like "purple fringing" - this shows in blown highlights in some lenses, not much you can do about it. What lens is it?


Brian

[gemmf]

CA is quite common for that lens.

[stir]

thanks alot for the reply guys.
i fell alot better knowing that it is normal.

i googled "purple fringing" and some recommendation is to get a strong uv filter to minimize the problem.

[marxz]

I doubt a UV filter will cut it out all that much, I had that lens for a while, had to stop it down a fair bit to control CA

It was a nice fast lens but below f3.5 I had to deliberately underexpose at least 1 stop to make CA acceptable and/or fixable in Lightroom

Apart from that nice lens though, good for B&W band/stage shots

[thelund]

i googled "purple fringing" and some recommendation is to get a strong uv filter to minimize the problem.

I don't know if a UV filter will be of any use, but it's a common problem so theres probably a quick fix option in Photoshop, I know there is in Paint Shop Pro which I use, it's called "Chromatic Abberation Removal..."


Brian

[andrys]

Also, try ptlens at
http://epaperpress.com/ptlens/

At the Examples page
http://epaperpress.com/ptlens/example.html

By clicking on the buttons for Chromatic Aberration example,
You'll see 100% with no CA correction and then
100% with CA correction

Free trial, from what I remember.

If you like it and everything else it does (superb utility
that also handles various types of distortion and easy,
viewable rotation:
then it's $15.00

Works inside Photoshop as a plug-in and/or as a stand-alone utility.