So im looking for a fish eye lens but i know nothing about them i found 2 that i like but idk how much of a difference the MM will be for close shots, rig shots, and so on...can anyone help me with this and explain the pros and cons to each lens
8mm lens
http://www.buy.com/prod/rokinon-8mm-f-3-5-aspherical-fisheye-lens-for-nikon-dslr-cameras/q/sellerid/26227071/loc/111/212727538.html
14mm lens
http://www.buy.com/prod/rokinon-14mm-f-2-8-if-ed-mc-aspherical-super-wide-angle-fisheye-lens/q/sellerid/26227071/loc/111/216238252.html
8mm lens
http://www.buy.com/prod/rokinon-8mm-f-3-5-aspherical-fisheye-lens-for-nikon-dslr-cameras/q/sellerid/26227071/loc/111/212727538.html
14mm lens
http://www.buy.com/prod/rokinon-14mm-f-2-8-if-ed-mc-aspherical-super-wide-angle-fisheye-lens/q/sellerid/26227071/loc/111/216238252.html