I rented the Sigma 150-600/TC combo before Christmas as part of my research into what lens to buy for BIF and with that combo on my D500 it would auto focus out to 600 but only in the middle of the day in full sunlight. As the sun started to drop the struggle started. At dusk there was no chance with the TC while without focusing was very good. Granted this was a short sample of one combination on one day, but I did cross that combo off my list. I have settled on the Tamron 150-600 Gen 2 as soon as I sell some extra motorcycle junk I have held onto for too long!
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