EOS AFing below surface of H2O

[Ken Durling]

I was shooting around tide pools today, and despite what I thought 
was pretty careful focusing, photos of sea urchins under the surface 
of the water were out of focus.  Does AF get fooled by the 
intervening water surface?  Is there a trick?  I don't think I've 
tried this before.  There are no visible water reflections in the 
photos that the AF could have grabbed, the water was very still and clear.

Thanks for any help


Ken

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