Hi, The following lens, to be used with a Nikon D50, can be an alternative to other more expensive lenses: http://www.bhphotovideo.com/c/product/360350-REG/Tokina_ATX124AFPRON_12_24mm_f_4_AT_X_124AF.html The other two alternative lenses are the following, from the same brand name, but more expensive: 12-24 mm. : http://www.bhphotovideo.com/c/produ...124DXIIN_12_24mm_f_4_AT_X_124AF.html#features 11-16 mm. f/2.8 : http://www.bhphotovideo.com/c/product/554036-REG/Tokina_ATX116PRODXN_11_16mm_f_2_8_AT_X_116.html My questions are the following: Compared to the other two lenses, would you buy it ?? Thank you, very kind regards, igmolinav.