I have 5 SDM lenses, but use the 60-250 95% of the time for my dog photography.
It works well every time I use it.
However, as I've mentioned before here on the PDML, my 50-135 needs some help
getting started when first mounted. You could say it's my fault for not using
it a few times a month, but I so easily assume blame for everything.
What I have to do is manually turn the focus ring back and forth over it's
entire range from 10 to 30 times with the lens active for AF. Once working,
they seem to remain so with occasional hesitation. I know these lenses should
be sent off to CRIS or Pentax for "repair", but all of the lenses are well out
of warranty, and were when I used them other than brand new testing after
unpacking.
I'll do a little test right now and report.
16-50* = worked in daylight just fine, but took a while (< a minute) to
work in dim light.
Last used more than 6 mo. ago.
17-70 = worked right away in daylight and dim light.
Last used more than 3 mo. ago.
50-135* = took 15-20 back and forth stop to stop rotations of the focus
ring before it would A/F at all. Took a few focuses
in daylight before it would work in dim light looking
at cable box display. Last used two weeks ago.
60-250* = worked right away in both daylight and dim light. Used a week
ago.
200* = worked right away in both dim and daylight. Last used 2 years
ago.
If that would be of any help to anyone thinking of purchasing any of these
lenses, it was worth the time finding all of them, in file cabinets, cardboard
boxes, and various desk drawers. :-)
On Mar 10, 2011, at 18:33 , Rob Studdert wrote:
> On 10 March 2011 23:03, eckinator <[email protected]> wrote:
>> hard to believe is fine. but I take exception at people saying it was
>> a lie without producing so much as a shred of proof or a better
>> explanation. imho that is just unnecessary and uncalled for. I don't
>> recall who said it and it is all bygones but I remember at the time I
>> found that pretty weak, Not saying it was you, I honestly can't
>> remember.
>
> Frankly from an electronics eng perspective it's one of the weirdest
> explanations I've heard for what seems to be a mechanical failure.
Joseph McAllister
[email protected]
“ Nature is considerably more creative and inventive than humankind. Without
Nature there isn't any humankind. Without humankind, Nature is fine.”
--
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