Thanks, Jos. I don't know that I'm willing to perform surgery. I'll have to look into the 15mm. It might be an interesting item.

On 11/1/18 4:35 PM, Jos de Fotograaf wrote:
Hi Doug,
I tried the Sigma 8-18mm on my K1.
On FF it gave only APS-C coverage as it was limited by the build on metal sun-shade. I carefully cut of the sunshade, this increased the coverage to a square APS-C coverage at the same optical quality as original APS-C
The coverage increased a bit further, but with reduced optical performance.
Then I bought a 15mm Irix firefly and enjoy this lens very very much.
Greetz, Jos


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