Just chasing some info in view of my new Sigma 10-20. I find this an excellent lens but have noticed, mostly at around 14-20mm I can see what looks like a type of crazing in the through view finder. Actually I am pretty sure I have seen a similar thing on my 70-200 L but not as noticeable as the siggy.. It can been seen in the image if you push out to 100% and wind the sharpness, contrast, saturation etc right up but apart from that I would not think you would see it in a normally processed image.
My Question / concern is, is this some type of element coating appled to reduce flare or such or (this is my concern) do I have a bad copy where a element coating has not be applied properly or is deteriating due to a fault in production.
The lens is basically brand new and I have only had the lens about 3weeks with probably a weeks of part days use to dates.
Anyone else noticed this with their lens and is it normal.
@Bill, mate I would think you would have noticed it in your Sigma if this is normal across the product.
I have attached a pretty tight crop - it looks a little like noise in this shot but is not and if you look close you can see it is a pattern like crazing.