The 1.7x adapter was supposedly not usable with lenses slower than f
2.8, however I've had no problem using it with the A*300 mm f4.0. It
works very well with that lens so I would expect that the 1.4 converter
would work fine with slower lenses as well.
On 3/15/2014 8:33 PM, Ken Waller wrote:
Welcome home Stan.
Have you noticed any issue with the auto focus at smaller aperatures?
I recall with the 1.7 'auto convertor' there were issues focusing with
smaller aperatures.
Kenneth Waller
http://www.pentaxphotogallery.com/kennethwaller
----- Original Message ----- From: "Stanley Halpin"
<[email protected]>
Subject: GESO: HD DA1.4x trial
We got back from our Israel trip about 2:00a.m. Thursday, and about
every spare minute since then I’ve been working against deadlines on
all three of my part-time jobs. And thinking about filing taxes before
i leave again in 2.5 weeks.
I did just take a few minute break. Downloaded and installed the K-3
ver. 1.03 firmware. Mounted the 1.4x teleconverter on my DA* 300/4.0,
mounted the pair on a K-3, stepped outside and did a few quick snaps
of a Downey Woodpecker on a feeder about 8 feet away. A sampling (3)
of the results may be seen here:
http://photos.stanhalpin.com/p649772105
AF was smooth and precise, no different than with the lens mounted
directly on the camera.
Once I get past these deadlines in a week or so I will try to do a bit
more evaluation, e.g., with other lenses both slower and faster, etc.
Meanwhile, my quick assessment is that if you want/need a 1.4x, I
can’t see any reason not to go with this one. Aside from the price
which may or may not come down a bit.
stan
p.s. Israel was a wonderful experience, Boris went above and beyond
in assisting at many steps along the way, and the trip was a great
success for us. In a week or two I hope to be able to get back into
the 6000± images and assemble a small gallery to supplement or
substitute for those I’ve already posted.
--
A newspaper is a device for making the ignorant more ignorant, and the crazy,
crazier.
- H.L.Mencken
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