I spoke to Tamron a month or two ago about the possible future repairs
of my lens, and they told me it would not be a problem as long as it
did not involve the Pentax Mount or the tele-converters. I imagine
that anything that may be wrong with your copy can be rectified by
Pentax USA, as the Adaptall mount is pretty standard, ne?
On Jul 4, 2009, at 18:49 , P. J. Alling wrote:
It looks like someone disassembled the lens and screwed up the group
spacing when they reassembled it. If that's true it probably cannot
focus correctly, but it that is the problem a competent tech should
be able to fix it, if the necessary parts, spacer rings and the
like, are available.
Francis wrote:
Hi Pentaxians
Do you know if Tamron's SP 300mm f2.8 (60B) is compatible with
Pentax DSLRs or not?
I bought one of these lenses this spring to use for wildlife
photography on my Pentax K20D and when it arrived (looking almost
new) it seemed to have sharpness issue which I was not familiar
with. The images are very soft (in an odd way) and "fringy" when
the lens is used wide open and only become sharp after about F6 or
F8. I have uploaded a sample photo at: http://www.islandlight.ca/fm087749-100-crop.jpg
it is a 100% crop at f2.8 on a tripod.
I sent the lens in to Tamron Canada who didn't fix (or find) the
problem, but fixed the mount instead. They said that if there was a
problem that they had missed (the technician hadn't actually tested
it because they had no adaptall mount on hand to test it with :( )
that no one would fix it because it was discontinued, but indicated
that the problem was just that it wasn't designed for digital media.
Do you know anyone who has used one of these lenses on a Pentax
digital? Should I invest in sending it to Tamron USA (who said they
could likely fix it) or is it just not going to work with a digital
SLR.
Thanks for your help,
Joseph McAllister
[email protected]
http://gallery.me.com/jomac
http://web.me.com/jomac/show.me/Blog/Blog.html
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