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Standard zoom and mid range Lenses with focal lengths larger than 12mm, but no longer than 60mm, includes standard zooms and portrait primes plus some macro lenses.

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Old 15th April 2018
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18-150 ll Purple Fringing Why?

Walking in our local woods today I visited a friend of mine, an old and much damaged oak tree:




I was using my EM1 Mk1 and 14-150 ll lens. It had a Hoya HMC UV filter and the Olympus lens hood.

I was very surprised to see this extreme purple fringing at the top right hand side of the frame.




I have had this as a rare experience with a Fuji lens, but never seen it on any of the many Olympus lenses I own or have owned.

It is only on one shot and no signs of it on any other.

Any ideas how/why this happened please?
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Old 15th April 2018
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Re: 18-150 ll Purple Fringing Why?

Any 10X zoom is a design compromise, so with a backlit subject and using the lens at the widest end of its range is pushing the limits of its capability.

You have also used a fast shutter speed, so slowing that down and closing the aperture, will help to reduce this somewhat.

Fortunately, it's a well known effect and CA correction is widely available in many editing software packages,
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Re: 18-150 ll Purple Fringing Why?

Graham,

I have used this lens a lot, and any CA is very small and can easily be corrected in Lightroom.

In this case it was not possible to correct it in LR, at least not by me.

As you you can see in the detail image, the purple fringe is very wide.

In fact I don't believe it is CA at all. If it were, the branches would have a red strip on one side and a blue green strip on the other.

The purple fringing was only in the top left corner of the image but nowhere else.


Any other ideas anybody?
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