i would like to know more about 10-20 wide angle lens.
The DX 10-20mm is terribly limited in that the list of cameras it won't work with is far longer than the list of cameras it will work with... I'm not even sure if it supports the D7200... you have to crawl into the camera's menus to enable or disable VR and the M/AM settings (which no longer have dedicated switches on the lens itself). However, if you do happen to own a camera that it will work with it may be hard to resist. Especially at this price point.
It does not support the D7200… only D7500, D5600, D5500, D5300, D3400, D3300, D500 and later models. It really looks like a UWA kit lens, complete with plastic mount.
While I guess I can't argue the build quality for the price (seems they went directly after the Canon 10-18 F4.5-5.6 - about time I guess), and I'm pretty certain it will be good optically. But, for $190 more, the new Tamron gives a metal mount, weather sealing, a better focus ring with distance scale, physical switches for autofocus and VR, a full stop more light, greater zoom range, electro-magnetic aperture (which works in Live View/video), and support for more cameras going back as far as D300.