Well, I don't know exactly what to tell you. If it were an old style K
or A lens I'd say check to make sure the aperture is snappy, and that
the focus is smooth,(same with zoom). Take a few shots and make sure
the lens is sharp across the frame, at various focal lengths apertures
and distances. Look out especially for decrementing, which shows up as
one side or the other of the frame being in focus while the other
isn't. It can happen in manufacturing and not be caught by quality
control, or if the lens has taken a few hard knocks. Other than that I
can't tell you.
On 2/16/2016 8:25 PM, Ed Keeney wrote:
My quest for a new lens (I was looking at the 17-70 f/4) has taken a turn.
One of my local brick and mortar's has put up a used Pentax 16-50/2.8
AF-DA* (as well as a Pentax 50-135/2.8 AF-DA*). Both are in excellent
to mint condition.
I'm itching to pull the trigger on the 16-50, it's a little higher
than I want to spend, but I might be able to convince myself to do it.
My questions to PDML...
Since I can physically handle the lens and take test shots with my own
camera, what am I looking for? Is there a set of shots I should take
to test the lens? What am I looking for in a used lens?
Thanks!
Ed
http://www.flickr.com/photos/edkeeney/
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I don't want to achieve immortality through my work; I want to achieve
immortality through not dying.
-- Woody Allen
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