Acquired a Tamron 100-400mm today so fitted It to my Nikon D500 and went out to test It as some of these lenses have focal issues..Seems to be fine though...R.
I'm considering the same lens for a trip to Yellowstone National Park--lots of wildlife out there, y'know--or the equivalent Sigma 100-400. Would be interested in what you think of the Tamron. This certainly got you in close... how far away were you?
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