4 aspherical, 1 extra low dispersion, 2 low dispersion
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It does have some compromises, but most of them can be seen at face value. These include an abbreviated zoom range relative to competitors and a lack of a built-in image stabilizer. An unseen compromise is a less-than-pleasing bokeh in certain situations [...] The lens has a reasonably nice build (including weather sealing), very fast and accurate autofocus, and a very strong optical performance across the zoom range.
Tamron 28-200mm F/2.8-5.6 Di III RXD (for Sony E) Lens