hei zekai, izzit possible to borrow from u a few minutes to test the sharpness of the lens ? notice that the images i get from mine are not as sharp as i expect it to be .... (comparative to the 70-200 HSM), even when stopped down. thinking of sending it in to sigma for servicing/focusing check, but wanna check out first.
if u r ok with it. drop me a PM with ur contact number. i'll contact ya. thanks !!!
you can take and try for a few daysif you come to hougang... heavy fcker man... did not buy the filter. not a filter person.