Sigma 17-70mm f/2.8-4 Dc and MC-11 Converter

Started Jun 2, 2016 | Discussions thread
cxsparc Veteran Member • Posts: 3,639
Re: How has the experience been

rocketjacket wrote:

"The big thing with the 1670 though is a) risk of getting a decentered one and b) the risk of getting a copy with poor side sharpness. If you get a copy without both issues, it is a fine lens."

Can you point me in the right direction to test my lens?


Don't worry. Simply do some test shots around 24 mm of a building front with lots of details. Do f4 and f8. Check at home. Return if decentered (you do have a return option?). Keep if not. Decentered = one side blurred much more than the other side.

That covers decentering.

Whether you have a good or bad copy regarding side sharpness you can check also at 24 mm f4 and f8 if you have another kit lens to compare to. If side sharpness is about equal to the 1650/1855/18105, you have a good copy.

Once you have that settled, you can enjoy and forget about the rest.

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