Thanks everyone for your input! (I never cease to be amazed by the
generosity of the members of this list, you guys are amazing!)
I uploaded some more samples to http://www.islandlight.ca/photos/temp.
Which are perhaps a more fair test (not so high contrast)
There is so much flare around what is in focus that I have been tending
to focus behind the subject because until I stop down it looks more
sharp then what is actually in focus. I don't know if it is normal for
that lens but it doesn't perform anywhere near the way my Pentax K 200mm
2.5 does (or any other lens that I have for that matter) and considering
the price I was expecting something slightly more impressive.
-----
>>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
I had hoped that the problem was that someone screwed up when they were
reassembling it, but what the people at Tamron Canada said made me a
little discouraged. It dose focus to infinity, does that mean that this
isn't the case?
-----
Thanks Joseph for putting up your test shots. It looks like your getting
much better results with your 300 then me although it's a bit hard hard
to tell because your subject is fairly low contrast. What is the Pentax
FA mount you are using? That sounds vary cool if it is what it sounds
like it is.
-----
Is the consensus that it need to be repaired, or is just not that hot of
a lens?
Thanks again for all your help,
Francis
PS. Sorry for the late response, I was away from the computer and then
the power went out.
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,
Francis
--------------------------------
Island Light Photography
www.islandlight.ca
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