Many, many, many, sharks, no dolphins (at least UW), yet. Actually sharks and dolphins are so large that you have to be so far back, or you have to use a wide angle lens, so a few milliseconds faster focus is still no big deal. The F-100 will focus more accurately and in less desirable conditions (low light, low contrast etc.), than all but (as far as I know) the F-5. Plus focus speed is not just a function of the camera. It is also dependent on the particular lens being used. How about a Jack swimming fast past your face, is that fast enough? (See below). It's not a great photo, but all I could do was point and shoot.Originally posted by blacknet
Rooster,
I take it you've never worked around dolphins or sharks You need all the advantages you can muster. Canon is the way to go in focus speed.
No system is perfect. The question of framers and fish came up and I presented a very workable solution for a limited budget. Besides you can guestimate the intersection in those cases and you can literaly get closer to the subjects in the cracks.
Ed
As far as the framers go, I wasn't contradicting your recommendations, I was just adding my experience with them. Besides one man's limitations are another man's strengths. With the DOF being so narrow at that magnification, guessing is just not an option with me (I always guess wrong!)
Dive Safe,
Rooster