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Fred Miranda wrote:
Rendering compared to Voigtlander 65mm f/2 APO-Lanthar
The Sigma 65/2 DG DN provides slightly smoother compared to the Voigtlander 65/2 APO, especially off-axis due to lower optical vignetting.
Here are some wide open comparisons:
This reminds of back in the day with the "old Sigma". By that, I mean that some old Sigma glass was labeled as APO, and there was consideration that all APO designations are not the same (inferring that Sigma's level of APO wasn't top tier) level of correction.
Here, we now have a non-APO Sigma which is probably better (correction and rendering) than anything the old Sigma APO could have dreamed of. Optics are always challenges in diametric opposition of various kinds. So, having seen Sigma go from old Sigma to Sport Series, to Contemporary Series to Art Series to I Series has been an interesting reflection on their journey.
Not to suggest that they are superior replacements for Leica ... but, since the Alliance, I think they've learned (learning) to take a page from Leica's playbook on striving for those balances. Blashphemy to put Sigma and Leica in the same sentence, for some ... but Sigma certainly isn't the same mfr they used to be.
Nobody really knows what the Alliance with Panny / Leica / Sigma really confers with regard to optics, but I can't help but think that Leica drives the bus, and the other two follow in their wake (it's a good wake) a bit. Yet, providing offerings that Leica doesn't ... so, as to not be a "direct compete". Of course, for Sony shooters they likely don't think as much about the Alliance influence, as L mount shooters might. But, I think we are seeing some benefit of Leica "hand me downs" ... or at least, trying to follow in the footsteps of the big brother. 
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