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Telephotos's are not the ideal lens for concert photography...the 24-70 2.8 would be nice choose, however, for those type of setting, if I was shooting them, I would stick with primes. The 24 1.4G would be my go to lens...great choice for wide-angle, sucks in light like a black-whole, and amazingly sharp. Followed by a 35 1.4 for the group shots and extra reach; lastly the 85 1.8G for the nice isolated shot of the band and extra reach.
FYI, Adorama is selling reburbished D7100s at a very low price. Shockingly low.
blackfox, does your grip drain power unexpectedly even without taking pictures? A major problem with many 3rd party grips is the power usage since they probably don't know all those power saving protocols that Nikon/Canon keep secret. But if your grip doesn't leak power, that would be good to know. Thank you.
Update on my new D7100. The day I got it took 50 pictures then did the picture of the white paper to check for dust or oil on the sensor. Clean, no issues.Just got back from vacation, shutter count is now 1,244 so today I took another picture of white paper and blue sky. No dust. I am so happy.