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Thanks Bogan and Doug!
I have trawled through the photozone tests some time back which helped me decide on the Sigma 17-70 zoom as a good budget choice for me. But for astro work it still doesn`t cut it ex the corners, even stopped down heaps it is only marginal. The reviews there are quiet good I find but without actually seeing what happens to stars ex in the extreme corners it is hard to put meanings to the figures.
I shall check out those links Bogan!
I also have a old 50mm f/1.4 lens and also find it excellent when stopped down below f/4. Just want something wider for big starfield shots and startrails.
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