MarkD:
Don't personally have one but one of Cookie's buddies (a wildlife pro using Nikon bodies) tried one as well as one of the 150-600's. They pal around cooperatively for about 8 or 9 days each fall. His comments were that for the money they are good daytime lenses with great resolution. During the earliest and latest portions of the day, however, they're a bit slow. He would have to kick his ISO's up considerably as opposed to those who were carrying big primes. He got a season out of them and then let them go. He is a very demanding perfectionist though, typically packing about $20,000 worth of Nikon gear around.
Given that about 80% of Cookie's action comes in the first and last hours of the day, we've not gone that route although it was quite tempting. Not high rollers here, it's just a hobby, and there are no write offs. With crop sensors, one can get some serious reach though. .
A few years back, standard advice was to avoid anything that exceeded a 4X zoom. I.e. maybe a 100 to 400 or a 50 to 200. Seems many have backed off of that recently. An 18 to 400 would handle a lot of situations, Cookie carries a 100-400 and a 500 prime when wildlifing. If things suddenly come in close, she is out of business. She really needs a 3rd camera with something in the 28 to 250 realm.
Sadly, the next steps up involve serious coin.
Probably not too helpful, but I guess the real question is: how demanding are you? Might try doing a rental for a brief period, and if it floats your boat, go with it.
Last edited by 1minute; 01/22/18.
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