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Latest Review Posted Tamron SP AF 90mm F2.8 Di Macro
This Tamron lens is very very good optically (surely by far the most important aspect of any lens) !
Sharpness is wonderful and out of focus areas are smooth and I like them a lot !
AF speed (on Pentax K-70) is ok, it hunts sometimes but AF noise is horrendous )-:
MF is easy enough to implement (pull back the lens focusing ring and switch camera to MF (which you don`t have to do but then the cameras AF will override your MF and the focusing won`t be very smooth)

As you probably know there sadly are very few macro lenses that fit Pentax cameras, this Tamron being one of them. I can`t compare them with Pentax lenses but I can compare them with both Sigma 105mm OS macro and Sigma 150mm OS macro lenses (Nikon fit) and both have superior AF in speed, accuracy and lower noise and are possibly even sharper ! However, both are bigger and heavier and more expensive too !

I do recommend this lens, it`s not perfect but it does allow a great deal of fine detail to be recorded !

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