Return it if it's no good.
I bought the Sony Zeiss 16-70mm used which is reported have more QC issues than this lens and got a terrific copy. You just need to buy selectively either with return options or with possibility of testing it first or owned by a forum member for example who you know will have tested it.
To some extent I'd argue it's better buying used because you can sometimes know what you are getting unlike new one which is pure lottery
Or you could say a Samyang 35 and 50 1.4 is £100 more than a used Zeiss 35. Nearer the £500 mark, makes the difference almost double.


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