Originally posted by pepperberry farm just arrived
I hope you already started to enjoy this beautiful lens.
I have the non-Anniversary version, like yours. Makes zero practical difference.
About a year ago I did an impromptu comparative test of my best 180/200mm lenses in PK and M42 mounts. The Tamron SP came out second, clearly beating very good optics like the MC Sonnar 2.8/200mm M42. Only the Pentax-A Star 2.8/200mm did better.
For portrait use on full frame the Tamron is preferable, though.
I see that most of these lenses (including mine and, from what I see, yours) are sold without hood. The original Tamron hood is difficult to come by and usually very expensive.
Personally I gave up trying to find one and will probably try to adapt a cheap second hand substitute. It has taken ages to find the original hood for the Tamron SP 17mm. I recently found one for cheap in a set of worthless accessories, that included in the description only another remotely desirable item: a Takumar hood. The picture wasn't clear at all, I bid anyway, won the auction, and finally found that the mysterious hood branded "Tamron" was in fact the rare one specifically made for the 17mm! For a few years I had tried my best to come up with other creative solutions, adapting other hoods, but all of them produced vignetting on FF.
The 180mm needs a hood cause the front element is exposed, but I'm not willing to spend a few more years to find the original one. I believe a Chinese metal/plastic hood would do, cause there is no risk of vignetting this time...
Cheers
Paolo