Ok, Mr Heaton this one is for you. Thought i would add the appropriate subject for you....
As you can see, the obscuring of the sun makes in my mind at least a very nice photo with readily frozen rays. The unobscured sun, again rays are frozen and i was able to balance the exposure due to it being a CFWA. But i think the sun still a little overpowering but not too bad. I still don't think this will work very well with larger creatures that you can't get close enough to to light up properly with an f8 or f11. But that is ok, i have just decided its time for a compositional change of style anyways....
Depth is about 20 feet. Shot with D70, ISO 200, YS120s diffused on full power
Obscured sun, f13, 1/800
Non obscured sun, f14, 1/800