Originally posted by ksparks519 How do you think the tamron 70-300 stacks up with the pentax DA 55-300's? A bit closer focusing distance than the cheaper ones, but 95cm is approaching the awkward zone for me anyway.
I have the inexpensive DA-L 55-300, which is optically the same as all the non-PLM 55-300 lenses, and it is significantly better than the Tamron in basically every way but three...
It vignettes significantly on full frame; it has no aperture ring (so no go on old film cameras); and it doesn't do 1:2
If you said, "I have a K70 and want to shoot general purpose stuff", I would definitely say to go with the Pentax (or the newer PLM), but the Tamron does a good job with 1:2 that the Pentax doesn't
The Tamron is at its weakest above about 200mm for distant objects. It gets a lot better up close and at shorter focal lengths, especially stopped down to f8.
-Eric