Focus Problems? What Focus Problems?

Tried using autofocus, and whaddya know? It works!

Now to try a different lens, since further reading suggests the Sigma 10-20 is terrible in IR (despite being a great lens on a normal camera). Note the hotspot on the central pinecone.

The subject here is a collection of pinecones in an orange Depression-glass bowl, sitting on a pale red (ie: not ruby red) glass plate.