Chromatic aberration in 35mm Summicron M APO

[Derbyshire Man]

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2 hours ago, Bikie John said:

My understanding, from reading similar threads here rather than personal experience, is that fringing is worse, potentially a lot worse, when the subject is not in focus. The APO bit is excellent for the plane of focus but there are no guarantees  away from that and sometimes APO designs are worse than more traditional ones. So since you have discovered a focussing incompatibility that may well explain your fringing issues.

Time for an EV-1? 😁

John

Very good point John. I'm going to head down and get the calibration of this particular lens checked.

[patrickcolpron]

On 10/29/2025 at 12:09 PM, Bikie John said:

My understanding, from reading similar threads here rather than personal experience, is that fringing is worse, potentially a lot worse, when the subject is not in focus. The APO bit is excellent for the plane of focus but there are no guarantees  away from that and sometimes APO designs are worse than more traditional ones. So since you have discovered a focussing incompatibility that may well explain your fringing issues.

Time for an EV-1? 😁

John

I am going to disagree that this is the specific issue regarding the images presented in this thread as these images should have been made at close if not at infinity focusing. 

About the image from a couple of years back, to see the fringing I had to zoom in a 250% to really notice it.

The sun is finally out, made a photo of my wife in the garden, made straight into the sun and zero fringing. I posted that image in the APO 35 image thread.

I also made a photo straight into the sun in a manner where it would cause fringing if that was an issue of the trees in the backyard and ... no fringing, photo and 300% crop of said photo bellow.

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And a screen shot at 300% zoomed in on the photo

There is very little fringing to my eyes, photo made at f/5,6 

This is one of those where as my best friend who is a network specialist would have said, it is a picnic issue, when someone called him about computer issues, problem in chair no in computer.

I just don't see it, but then again I don't close down my lenses to f/16 so what do I know 

*let the vilifications begin 

[Derbyshire Man]

46 minutes ago, patrickcolpron said:

I am going to disagree that this is the specific issue regarding the images presented in this thread as these images should have been made at close if not at infinity focusing. 

About the image from a couple of years back, to see the fringing I had to zoom in a 250% to really notice it.

The sun is finally out, made a photo of my wife in the garden, made straight into the sun and zero fringing. I posted that image in the APO 35 image thread.

I also made a photo straight into the sun in a manner where it would cause fringing if that was an issue of the trees in the backyard and ... no fringing, photo and 300% crop of said photo bellow.

Welcome, dear visitor! As registered member you'd see an image here…

Simply register for free here – We are always happy to welcome new members!

And a screen shot at 300% zoomed in on the photo

There is very little fringing to my eyes, photo made at f/5,6 

This is one of those where as my best friend who is a network specialist would have said, it is a picnic issue, when someone called him about computer issues, problem in chair no in computer.

I just don't see it, but then again I don't close down my lenses to f/16 so what do I know 

*let the vilifications begin 

You keep saying this Patrick but as I pointed out the shots were at f4 and f16. There was no difference. I was testing the lens which was 24 hours in my possession. Quite why the first impression of so many on this forum as that everyone else is an idiot is a mystery to me. I had my first fully manual SLR with a handheld light meter aged 8. I'm now 58. I think I'm beginning to get the hang of it.

[patrickcolpron]

1 hour ago, Derbyshire Man said:

You keep saying this Patrick but as I pointed out the shots were at f4 and f16. There was no difference. I was testing the lens which was 24 hours in my possession. Quite why the first impression of so many on this forum as that everyone else is an idiot is a mystery to me. I had my first fully manual SLR with a handheld light meter aged 8. I'm now 58. I think I'm beginning to get the hang of it.

That was my first impression of the forum too. I am one of the everyone else, that hasn't changed. It comes as no surprise, I am an idiot.

We both have been shooting since we were 8, we are about the same age. That doesn't mean squat because...

I've realized the vastness of my ignorance about 25 years ago, and I still have a lot to learn.

I feel I am going in circle, this is why I am everyone else to the people on the forum still.

We are using different M cameras, maybe it isn't the lens, perhaps it is the sensor, but what do I know, I am just anyone else to everyone else, just an idiot to most. 

I still have a lot to learn and miles to go before I sleep, miles to go before I sleep.

Hope you find a resolution to your issue, and no I didn't and still don't think you are an idiot.