TT520 Flash Speedlite review,
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This review is from: Neewer TT520 Flash Speedlite for Canon Nikon Sony Panasonic Olympus Fujifilm Pentax Sigma Minolta Leica and Other SLR Digital SLR Film SLR Cameras and Digital Cameras with single-contact Hot Shoe (Accessory)
This being the first flash I've bought I can't talk for all, but it's seems to be fantastic for the price as a starter for someone just getting in flash photography. Using good quality batteries it lasts a good while (I believe most flashes burn through batteries rapidly). It's works fine on a Nikon D7000.