The Tamron SP 15-30mm f2.8 Di VC USD G2 incorporates a number of enhancements to the company’s already excellent flagship ultra-wide angle zoom lens

When Tamron released the original version of their SP 15-30mm f2.8 Di VC USD high-speed ultra-wide angle zoom back in 2015, we praised it for its sharpness, color rendition, and versatility, but felt that there were some areas that Tamron could improve on. Enter the Tamron SP 15-30mm f2.8 Di VC USD G2, Tamron’s 2nd generation refresh of the same lens that we had reviewed some four years ago which incorporates a number of improvements upon the well-received original. A pair of MPUs (Micro-Processing Unit) along with a VC (Vibration Compensation) mechanism resides within the SP 15-30mm f2.8 G2 and work in tandem to ensure snappy autofocus performance while maintaining image stabilization.
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https://www.thephoblographer.com/2019/06/04/review-tamron-sp-15-30mm-f2-8-di-vc-usd-g2-canon-ef-mount/