This is a technical comparison test between the Sigma 65mm and Sigma 50mm cine lenses. I have also included a Tokina 50mm Vista for reference. The Sigma Classics are supposed to be the same as the high speed lenses but with a lack of coatings.

The test was done on a Canon C500MKII in Full Frame mode shooting XF-AVC UHD with the WideDR Picture Profile

Resolution Test
All of the lenses are suitable for full frame 4K wide open. The Sigma 65mm is sharper than the Sigma 50mm wide open. The sharpness of the Tokina is comparable to the Sigma 50mm. Both the Tokina 50mm and Sigma 50mm are about the weakest in their set so this is not surprising.

Bokeh Test
The Sigma 65mm test has very even bokeh with some cats eye on the outside wide open. The Sigma 50mm is over corrected wide open with obvious chromatic aberration. The Tokina 50mm has some cats eye wide open, is slightly over corrected, and has pronounced onion skinning. All of the lens’ CA and over correction clean up when stopped down.

Flare Test
The Sigma 50mm and 65mm are very similar in regards to flare. The Tokina has the pronounced green flare that characterizes the Vista lenses. The classics flare out completely as expected.

Breathing Test
The Sigma 50mm focuses closer than the 65mm and has more noticeable breathing. The 65mm also breathes significantly, especially at close focus. The Tokina doesn’t breathe.

Conclusion
The Sigma 65mm is an overall better lens than the 50mm. It reminds me of the 28mm, 40mm, and 105mm in that it is sharper and larger than the other closest lenses in the Sigma cine series. I wish that Sigma had designed a lens that didn’t breathe for the 65mm, but overall I think the 65mm is exactly what was expected.

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