Sigma 30/28 vs Sony 40/25 on a6300 - 23 Oct 2021


A friend of mine requested that I do a comparison of the new Sony 40mm f/2.8 G lens against the Sigma 30mm f/2.8 DN on a Sony alpha a6300 APS-C camera. The Sigma 30/2.8 is hard to come by these days and is the sweet spot for the APS-C cameras when it comes to digiscoping. I've posted in the past that the Zeiss 35/2.8 is a bit soft on the a6300 (better for FF) so the only other alternative appears to be the Samyang 35mm f/2.8 lens.

First, the Sigma 30mm f/2.8 on a Digidapter™ platform adapter mated w/ the Swarovski STX85 and 25-60X eyepiece at 25X. Distance was about 25'. The Northern Cardinal was nearby on the feeder so I grabbed a quick pic.

Next, the Sony 40mm f/2.5 on the Digidapter™ platform adapter. This House Finch appeared so I was able to get a photo.

The Sony 40/2.5 lens diameter is ~ equal to that of the barrel of the Digidapter™ platform adapter but shows no vignette or CA when mounted flush against the barrel of the assembly, so it is very usable on the Digidapter™. Of course, using the Digidatper™ DLM is the preferred option for this lens as it makes for a quick, pocketable digiscoping adapter assembly.

For you digiscopers using Sony APS-C cameras the 40mm f/2.5 G appears to be great option for getting a bit more magnification to your images without sacrificing image quality or sharpness!


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