I'm looking for a wide-angle lens for my wife--just something more to add to her camera accessories. She has a Canon T5i, and has the current lens options of the standard 18-55mm lens, and a decent telephoto lens. In searching on Amazon, I came up with several wide-angle options. Reading the reviews is helpful, but they don't really tell me what that particular item does. For example this:

http://www.amazon.com/Altura-Photo-Professional-MagicFiber-Microfiber/dp/B0047YRKK8/ref=sr_1_3?s=electronics&ie=UTF8&qid=1426685017&sr=1-3&keywords=canon+wide+angle+lens

What the heck is that for only $26? Is something like that worth having? I assume it screws onto the end of an existing lens.

Then there is this, that looks like it might be a good choice:
http://www.amazon.com/Rokinon-FE14M-C-Ultra-Canon-Black/dp/B003VSGQPG/ref=sr_1_4?s=electronics&ie=UTF8&qid=1426685017&sr=1-4&keywords=canon+wide+angle+lens

What do you think? Is that a good option to add to her arsenal? She like taking outdoors/nature photos, and we'll be going to Zion in a couple of weeks.

Any help or suggestions you can give me are appreciated.