After my earlier trials and tribulations I managed to find a Sigma 1.4 with out any back focus issues, even took my own test chart.
As you can see it auto focused spot on the target line.
And here is a snap trying it out, lovely depth of field, smooth creamy bokeh.
Cheers,
Richard B.
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Check out latest underwater exploits :-
http://www.images-underwater.net/
and
http://www.images-underwater.net/blog1/
