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Roger at LensRentals.com had a couple of Tamron 15-30mm f/2.8 Di VC USD lenses show up in their repair department after the Memorial Day weekend with jammed zoom rings, and decided to show the world what’s inside the very good Tamron ultrawide.
…we found that the Tamron 15-30 f/2.8 is a well built lens, but certainly not very modular in construction. Where a modular lens, such as the newer Canon lenses, separates easily into three sub-assemblies, the Tamron came apart in lots of separate pieces