Terrible purple fringing on MD Rokkor 200 mm F4.5

iamcanjim

Mu-43 Rookie
Joined
Feb 3, 2014
Messages
23
Location
Lacombe, Alberta
Subscribe to see EXIF info for this image (if available)


Ok, I know I didn't get the focus or composition right here, but that's beside the point. What is causing the terrible purple fringing? The lens or some setting I have?

Taken with E-PM1 at 1/160 ISO 200 F4.5
 

Turbofrog

Mu-43 Legend
Joined
Mar 21, 2014
Messages
5,311
Wide open, most legacy telephotos designed for film will have bad purple fringing in contrasty conditions. If you can find one that doesn't, treasure it.

I usually just stop it down and call it a day. Alternatively, use the very excellent CA removal tool in Lightroom. It's good enough that I don't even both doing manual local adjustment, and while it's not perfect, it's at least tolerable.
 

kwalsh

Mu-43 Top Veteran
Joined
Mar 3, 2012
Messages
832
Location
Baltimore, MD
Ok, I know I didn't get the focus or composition right here, but that's beside the point. What is causing the terrible purple fringing?
Not beside the point, on many lenses slight out of focus in high contrast results in much worse purple fringing, that could be playing a role here. As already stated though not uncommon for legacy lenses to suffer from longitudinal chromatic aberration when shot wide open - that would be the cause of purple fringing in a perfectly focused image. Stop down the lens to reduce it.
 

ckrueger

Mu-43 Veteran
Joined
Jul 16, 2011
Messages
304
I don't know anything about that lens, but almost any lens will show PF in a scene like that. Like Turbofrog said, old teles are particularly bad for PF in backlit scenes like that.

Again, I don't know this lens very well, but I don't find it surprising that you see PF here. You can use LR to cut it down, although that PF cuts into your subject, so you'll basically be wiping out color on a good portion of your image.
 

RobWatson

Mu-43 Hall of Famer
Joined
May 17, 2011
Messages
2,343
Location
Washington - The Evergreen State
Even my CV Nokton 25mm F0.95 shows purple fringe which is not very well corrected using LR tools.

A lens profile built using the lens and camera (the exact ones) also struggles for good correction. Compose and expose carefully.
 

OzRay

Mu-43 Hall of Famer
Joined
Jan 29, 2010
Messages
4,991
Location
South Gippsland, Australia
Real Name
Ray, not Oz
Every one of my Voigtlander lenses (now all sold) exhibited purple fringing wide open; I usually had to stop down at least one stop and more often two stops to get rid of it. Hardy useful when you have a fast lens and want to shoot wide open.
 

iamcanjim

Mu-43 Rookie
Joined
Feb 3, 2014
Messages
23
Location
Lacombe, Alberta
It's funny. Even if I had nailed the focus (which I certainly didn't) that image would have been useless. Now that I finally got my 40-150 in the mail I have been getting slightly better results.

I guess that goes to show that modern but cheap lens > older but medium priced lens.
 
Top Bottom