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10-07-2016, 04:02 PM   #31
npc
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Join Date: Apr 2013
Posts: 309
I once had the chance to compare the "pentax" smc 18-250 vs the tamron 18-250 and amongst other things the coatings looked different on these two... Of course I can't be sure, but they seemed to have somewhat different colors under bright light.
So there's a chance it's really HD coating rather than just keeping the labeling consistent (like "SDM" for the motor).
However, I can't imaginge they just ship all the glass back and forth between Japan and Vietnam, more likely it's all done in the Tamron factory, maybe using Pentax provided equipment for the coatings.

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15-30mm, dslr, fa, flickr, full frame, full-frame, hd, hd pentax-d fa, iq, k-1, k1, pentax k-1, pentax-d, pentax-d fa 15-30mm, thomas
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