crwdns2934241:0crwdne2934241:0 Spikey2
crwdns2934249:0crwdne2934249:0:
I most likely is focus shift - and a 'bad lens'. If you can, you should return it for a properly working one. try shooting 'full open' and see how the results are - if they are better, its focus shift. if its not focus shift, then maybe the lens can be fixed by a qualified technician - not sure how 'easy' the are to work on.
crwdns2915684:0crwdne2915684:0:
open