Fringing on super wide angle?

[MiqsPix]

I took this with my Tamron 10-24 super wide angle with polariser but have some fringing on the extreme edges (particularly on the reeds on the left) where the focus is not so good. This I gather is a common phenomena with super wide angle lenses but I would like to limit it or remove if possible. I think it can be reduced by stopping down more but not sure. Any ideas please?



I realise that at this size you possibly can't see the fringing but would appreciate any common rule re this if there is one.

[Michael_2010]

I'm sure one of the more experienced members will be along to comment about the fringing, but I am more interested in your use of a polariser with that lens. I've read many discussions about that and most say NO polariser with an ultrawide. What are your general thoughts about that? Do you like the effect you get while using the filter?

[kirbinster]

I use a CP on my 10-20mm many times -- what is the problem you are talking about?

[navcom]

There are couple reasons CP's don't always work on wide angle lenses. First, the polarizer effect works best when you are 90 degrees to the sun. As you get closer to the sun, the polarizer effect changes. This "transition" can become very noticeable with wide angle lenses. As an example, you might see changes in the blueness of the sky from white to dark blue. The narrower your view, the less this change is perceptible.

Also, depending on design, many very wide angle lenses can't use a filter as you will see it in the photo (the field of view is actually close to 180 degrees).

Hope that helps!

[MiqsPix]

Thanks for the reply. I now understand more fully that the angle may be 90 degrees at the centre of view to the sun, but obviously a super wide angle, by definition, is going to include more image either side of 90 degree consequently reducing the polarising effect. Simple when you think about it I guess! Thanks again.

[ravncat]

To the OP.

The fringing is likely normal - an aberration of the lens design. As for what you can do about it - depends on the lens, The fringing will probably be reduced by stopping the lens down - for that lens, I don`t know how far you must stop down. Also - The fringing is likely to occur where lines or edges are contrasty - a lower contrast day would probably ease some of that.

A different wide angle lens with a better optical formula is another (very expensive solution). Most lenses have their foibles - wide angles tend to suffer from fringing. If you shoot in raw - or with a newer camera in jpg - you can do some software removal of fringing - but it may not be enough. A program like DXO optics pro will have very high quality measurements of fringing at different focal length and aperture - allowing for software correction of the fringing and lens distortion.



Side note about polarizers. Superwide won`t reduce the effect of the circular polarizer. I think reduction implies a uniform lowering of the effect. Instead you will get uneven polarization through the whole image because the polarizer is dependant on the light`s angle. So you can imagine a horizon from left to right - with full polarization affecting the middle, but fading to little effect on the left and right sides of the image.

[LenDog]

Originally Posted by ravncat

To the OP.

Side note about polarizers. Superwide won`t reduce the effect of the circular polarizer. I think reduction implies a uniform lowering of the effect. Instead you will get uneven polarization through the whole image because the polarizer is dependant on the light`s angle. So you can imagine a horizon from left to right - with full polarization affecting the middle, but fading to little effect on the left and right sides of the image.

Exactly, use a CPL at wide angle with discretion, it can add effect.

[OsmosisStudios]

The fringing is normal, but it's exaggerated by the editing (what looks like HDR).

[MiqsPix]

Thanks for all the info. As an addendum, alternatively shoot portrait if you can then you maximise the filter's capabilities!