Hello - I am new here and thanks for having me.
I am having problems getting good focus with my 5D Mk II and I have just noticed that there are green outlines on left of objects and red on right edges. This occurs where there are strong contrasts especially between dark and light colours.
I am using a 24-105 mm 1:4 L IS USM lens.
What could be the problem please?
That sounds like chromatic aberration. It is unusual to see in an “L” lens, though.
Notice the purple and green fringing.
The shot was highly cropped. Most lens correction algorithms can remove just about all of it.
I always shoot in RAW and if I remember correcrtly there was no (or barely perceptible) red/green outlines in PS RAW editor.
However, once the image opens from RAW to PS, then zoomed to 100% the lines are there.
I took this image as I was having trouble getting a focussed image (f11/100). The green and red lines are clear on the metal work against the white concrete tank stand. This is a jpeg for web, but the tiff has the lines too.
I'll look into doing what you advised.
I used a borrowed camera all last semester from uni (same Canon model and lens) yet no aberrations.
Thanks for your advice.
Photoshops CS6. I would appreciate to learn how to remove it, thanks.
I mostly convert to black & white but the fact that the problem is there is worrying. In the bl&wh conversion, the lines will still be visible at 100% I imagine, as lines that shouldn't be there.
Here's one way. Others may have additional advice, since I am not a Photoshop user.