I was out shooting the Aurora Borealis tonight, and when I got my images on the computer screen I noticed some strange circular patterns in most of the images. Anyone seen this before?
It appears dead center in all the images where there is some light.
EXIF: 5D3, EF 17-40L 4.0 @ 30.0 sec f/ 5.0 ISO 800.
See cropped screenshot attached.
I think this pattern is caused by your lens - or something inside it.
My dim recollection of physics tells me this is a pattern caused by phase interference between curved and flat elements in your lens.
Patterns like this are seen in "interferometry" - I have seen this used by opticians profiling the surface of the human eye for visual correction purposes.
I'm sure it's also used in camera lens analysis and alignment.
Possibly your lens has a defect or alignment issue between some of the elements?
I'm sure there's someone much more knowledgeable (Dr @neuroanatomist?) that can answer this.