http://www.adorama.com/PRO835EOS.htm...54059061058605 any comments or reviews on this lens.. im looking for a manual focus fisheye by one of these companies for my rebel xt. i saw a few before that were as cheap as this that were manual focus but high quality and dont remember the name. ANyone use these? or recommend others... or any new thoughts on lens adapters that look like fisheyes? also ones such as bower 8mm, falcon, sanuyung, etc. How are these? is there focus conformation? http://www.bhphotovideo.com/c/product/635178-REG/Bower_SLY358C_SLY_358C_8mm_f_3_5.html