Francis wrote on Fri, 03 Jul 2009 23:26:38 -0700:
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.
I had a problem with the zoom mechanism of a Tamron Adaptall-2
35-105/2.8 zoom lens I bought on eBay. Tamron USA
said that they no longer repaired this lens, and suggested I try their
authorized repair service Nippon Photoclinic in New
York. The folks there did a great job of rebuilding the zoom
mechanism and the lens works fine now. They also serviced
my Adaptall-2 300mm f5.6 macro lens, which was showing poor sharpness,
with good results. I highly recommend them
for Tamron lens service.
If you are interested, call them to discuss your problem and see if
they are able to service your lens:
Nippon Photoclinic, Inc.
920 Broadway, Ste. 705
New York, NY 10010 USA
Phone: 212-982-3177
Regards, Jim
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