Larry Colen escribió:
Because the manual focus on it feels horrible. It's "lumpy" getting
stiff with every rotation of the auto focus drive screw, then loose on
the other half. This also sort of makes it tough to focus accurately if
the focus point is where it doesn't want to turn.
If the lens were bad optically, I'd just return it. It's too much to
ask that all lenses feel like a supertak 50, but this one is beyond
reasonable.
I have the Sigma EX 28 mm. 1.8 macro. I know it isn't the same lens, but
it is closely related, and the manual focus feeling doesn't have
anything to do with your experiences with the EX 24 mm. If you disengage
autofocus BOTH on the camera and lens, manual focusing with my lens
isn't stiff at all, it is very fluid and nearly as good as with
traditional manual focus lenses. So I'd say that your 24 lens is
defective and you should exchange it.
Like I wrote in a previous message some days ago, you must be sure you
disengage AF by using both the camera AF/MF switch and also by pushing
the focusing ring on the lens towards the camera body, as,
unfortunately, these Sigma lenses can't deactivate the AF motor in the
camera body only by using the lens clutch, like genuine Pentax FA*
lenses do (FA* 24 mm. 2.0, FA* 300 mm. 4.5, FA* 80-200 mm. 2.8 and some
others).
Carlos
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