John, I suspect that if your lens doesn't produce excessive CA in
normal use it won't suddenly succumb to the pressure of shooting a
group:-)
On Mar 22, 2009, at 11:50 AM, Charles Robinson wrote:
On Mar 22, 2009, at 4:53, John Whittingham wrote:
Hi Charles
That does look quite unusual, especially for a lens stopped down @
f/5.6. I have to shoot large groups once a year for my employer.
the 16-50 would be my choice of lens this year, now I'm having some
reservations.
It's been to service 3 times now... I need to to some testing to see
if it's that severe still.
And, to be fair, the first service was due to a loose screw in the
base of the barrel... the 2nd time was focus issues... and the third
time was to repair damage I did when I dropped my camera bag (I
never sent it in to "fix that awful CA").
However, with that many visits to the bench - including the rebuild
of the front of the barrel that last time - it's likely that
whatever did that isn't doing it anymore. Fingers crossed!
-Charles
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Charles Robinson - [email protected]
Minneapolis, MN
http://charles.robinsontwins.org
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