Laurentiu Cristofor - In the context in which you quote me - "....
Adam - Thanks for making it clear that these cameras don't focus-bracket. It does seem odd - particularly for MF..." - yes, I was indeed referring to Manual Focus.
I do now see that the "particularly for" part might have made the reference seem vague.
What I was doing was referring to Focus Bracketing in the context I'm used to it - that is, with the camera I have that does it, the Canon SX10.
The camera has Manual Focus in all shooting modes other than Auto. And it will Focus Bracket in MF in P-A-S-M.
So one can wander about taking the usual shots in Shutter or Aperture Priority - but where needed - say, aim up into a tree at a bird - which has leaves / branches nearby - and the AF won't lock onto the bird only. At that point, press the "^" arrow on the 4-way pad, to change to MF (Manual Focus.) The ring around the 4-way pad rotates to adjust the MF.
It's quite nifty - but on a P&S Zoom - not as tack-accurate as those long-throw 260-degree Focus Rings on Takumar primes... So you can, hand-held - get pretty close to spot-on "selecting out" your bird from the leaves and twigs - but - if you've preset the MF with Focus Bracketing (see the Diagram) - with one press of the shutter button you get 3 rapid shots - at the MF chosen - a bit further, and a bit closer.
As you can see in the Diagram - which shows the "closest" setting - the 'further' and 'nearer' distances are pre-settable. And that is "sticky" - change Modes - Aperture to Shutter Priority, or either of those to Manual mode - selecting MF will still retain Focus Bracketing at the 1 of 3 distances preset. (Also after turning the camera Off and back On.)
Therefore - Focus Bracketing is a function that goes with, and is particularly useful in - Manual Focus.
In Shutter Priority it's useful when the target is shifting position - you can do 3 main shots - but get 9 images, 3 at different focuses for each main shot - in under 10-seconds, with the SX10. (The SX20 is somewhat slower.)
The SX10's Continuous Shooting is a leisurely 1.4fps. My Fuji HS10 does up to 12.5 fps Continuous - but doesn't Focus Bracket. A camera that could Focus Bracket 3-shots at even the HS10's midrange 7fps would be rather nifty...!
I was rather hoping that DSLRs could do that, or better... Which is why I asked.
Regards, Dave.