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RE: Tamron 45mm f1.8 Di VC USD Lens Review
Yes definitely not a common focal length! It tends to go for around 500-600 bucks. When I shot Canon, I found most of their lenses focus extremely fast, but unfortunately many Nikon lenses are less than impressive with focus speed. The fastest AF lens I have is my Sigma 85mm 1.4. I was underwhelmed by the focus speed on the Nikon 85mm 1.8g.
Wow that is expensive. I think the cheaper Nikon lenses are slower - but it's the same for Canon when I used to use the cheaper primes they were slower. If you buy the expensive lenses (1000 dollars/pounds or more) or the L lenses (for Canon) they tend to be very fast by comparison.