Color fringing & Nokton 1.5/50?

[lukaz85]

Hi, first I have to say that I'm enjoying read this forum for a while. Now my question: I've purchased a Bessa R2 / Nokton 1.5/50 not long time ago and I really like this combo. Today, I got a film back with a scans on CD (low-res) and I noticed purple fringe (not only in this example) around contrasty edges. Is this really caused by the lens or could this be a problem of the filmscanner? I shot Fuji PRO400H (at 320) at nearly full-open aperture. From looking at the EXIF, the photo lab used Fuji SP-3000 for scanning. Attachement is a 100% detail.

 

[chris00nj]

I've taken a lot of photos with the Nokton and don't notice a purple fringe. Have a look at mine.

 

[Don Hutton]

I've taken a lot of photos with the Nokton and don't notice a purple fringe. Have a look at mine.

You're not going to see CA on 500 pixel wide images - I would guess that, if it's there, the full res shot of the statues on the frontage of the Basilica di San Giovanni (second shot) would show it... if yours shows any - one of the issues with CV lenses generally is some sample to sample variance.

 

[novum]

I used to own a Nokton 50/1.5 and I had no such problems with it. I liked everything about that lens except for its size--the M-Rokkor 40/2 spoiled me in that regard.

 

[Gabriel M.A.]

I noticed purple fringe (not only in this example) around contrasty edges.

What I notice in this shot that is different from the other ones that have been offered here, is that I can see that your shot may have been shot "wide open", whereas this lens tend to get shot stopped down (often and considerably by their owners) when shooting in broad daylight.

It's not the same lens, but I've shot the 35mm f/1.7 Ultron with the M8 wide open, and let me tell you, that's a dream lens if you love chromatic aberrations. I also see it in shots taken (by me) with the 40mm f/1.4 Nokton wide open and with very bright subjects.

I hardly ever ever see this with my other lenses on the M8, including the Jupiter-3, except once I saw it with the 50mm f/1.4 Summilux pre-asph in a very very nasty lighting condition setting, and even then only the brightest overblown edges had chromatic aberration.

One thing to think about: do you use a UV filter? I'm guessing that you do, and it's not MRC.

 

[Prosaic]

Is this really caused by the lens

Yes...

or could this be a problem of the filmscanner?

No...

 

[Spyderman]

as Prosaic said, but...

but the scanner and especially its resample algorithm could emphasize the fringing.

 

[lukaz85]

Thanks so far for the answers.

@Gabriel: You're right, this was wide open. It wasn't the brightest situation, as I used ISO400 Film. But at least enough contrast to provide CAs. And no, I don't use any UV Filter.

@Spyderman: That was also my final conclusion, because I also noticed enhanced grain thanks to some oversharping.