The limit was more camera dependent, if the open aperture is close to or
below the ev threshold for the AF sensor, auto focus will be
problematic. In bright light I've never had the AF 1.7x fail achieve
focus with any lens and camera body I've tried it with. It really
starts to hunt with the *ist-Ds in dim lighting with any lens with a
maximum aperture of f4.0 or slower. I never noticed an issue with it on
film bodies, but then again I never had insanely high ISOs to work with
with film.
The documentation states that it's limited to lenses with a maximum
aperture of 2.8 or wider.
On 11/9/2014 7:22 PM, Ken Waller wrote:
Cute capture Paul.
Have you run into an aperature that causes the AF to not focus with
the DA convertor?
I believe that the old 1.7 AF convertor had a limit for AF to operate.
Kenneth Waller
http://www.pentaxphotogallery.com/kennethwaller
----- Original Message ----- From: "Paul Stenquist"
<[email protected]>
Subject: PESO - A Kiss for Mom
K-3, DA* 60-250/4, DA1.4X Converter, 350mm, f5.6, 1/800th, +0.3
exposure comp, ISO 1600
http://photo.net/photodb/photo?photo_id=17900593&size=lg
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immortality through not dying.
-- Woody Allen
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