You are right, but I am sure that the shading is dominantly caused by the hood.

It is not in the corners but away from the corners, clearly due to the pedal shaped hood.

The corners start vignetting at approx 13mm


On 26-Feb-17 16:22, Bruce Walker wrote:
Are you quite certain the vignetting isn't from a decreasing image
circle as you zoom out?

I don't know one way or the other, but if you cut the hood and
discover that doesn't fix the problem, you'll be mighty pissed. :)


On Sat, Feb 25, 2017 at 2:31 PM, Jos de Fotograaf
<josdefotogr...@4prof.nl> wrote:
I have the Sigma 8-16mm and it gave me nice pictures on the K5. Sharper than
the Sigma 10-12 EX that I had for a while.

Using the 8-16mm on K1 in FF mode, is okay at 16mm, but zooming out, brings
in shadowing from the sun shade.

The sun shade is fixed to the lens and I am thinking of cutting away a part
of the shade.

Is this a good idea?

And what is the best way to cut, with a sharp knife or with a Dremel, to
maintain a nice look?

Any thoughts?

Greetz, Jos


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