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,
Francis
--------------------------------
Island Light Photography
www.islandlight.ca
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