BW,
Focus does not change much unless you turn your hand while zooming.
Your method works just fine for a stationary object. And maybe even for
a slow moving object. But I do not believe that it works well for a fast
moving object. Say a horse running on a track while you are doing photos
from the infield. Perhaps a plane doing acrobatics over the runway you
are standing on. How about your own little league base ball star running
the bases or going for that fly ball while you shoot photos from down
the first base line.
One touch allows the zooming and focus to be going on at the same
time and without shifting your grip. This is great when the objects
distance is changing from your perspective. You can focus and frame on
the fly. Of course don't forget your winder or motor drive so you can
grab a few frames.
Mark
ONLYOLYBW@xxxxxxx wrote:
>
> chling@xxxxxxxxxxxxxx writes:
> << > The other difference that I failed to mention in my original reply to
> > Dan is that the 85-250 is a two touch lens and the 65-200 is a one
> > touch. I greatly prefer the one touch design. I find it far more usefull
> > when dealing with fast moving objects. It allows the focus and framing
> > to be adjusted without any shift of grip on the lens.
>
> Yes, I agree the one touch design works much faster, but the resolution and
> sharpness of the 85-250 is great even at close focus.
> C.H.Ling >>
>
> Hi C.H.,
> I've never used a one touch zoom. But, I think as one would zoom in & out,
> you would be prone to change the focus. I usually zoom out to max and focus
> and then zoom back to frame and shoot. This works great with a two touch
> lens. I would question this method with a one touch.
> BW
>
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