I would suggest to you that the camera itself cannot "lose" the focus if
it's *not allowed* to focus. If you're truly using zone focusing the
focus should be fixed. As long as that shutter button it tied to the
focusing motor you are not "zone" focusing because the camera is taking
control again as soon as you half press the shutter button.
If you were shooting at 300mm and the image you showed us was not
cropped you had to be about 200 feet away. At that distance (assuming
wide open at f/6.7) you have at least 25-30 feet dof on both sides of
the point of focus. I think it should work if the camera's focus
mechanism if shut off. Switch to manual and pre-focus on that spot if
you can't change the settings on a borrowed camera.
Chuck Norcutt
On 1/26/2013 9:55 PM, David Young wrote:
> I would pre-focus on a spot, and then try to pick up the bikes or quads as
> they
> came into that zone, and then follow them until the composition was near
> right.
> (A system I've used for thousands of successful images, taken over the last 3
> years, at the same lake.) But the camera nearly always lost the focus, and
> then started to hunt wildly - meaning no chance for even a bad shot!
--
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