Battle of the best 20/21s: Sigma 20/1.4 Art vs Zeiss 2.8/21 Loxia

20 art 21 loxia
Images courtesy respective manufacturers, composited to roughly correct relative size – my samples had to return home before I got a chance to put them together in the studio for th usual product shoot, and I’m still awaiting delivery of my own personal lenses.

I’ve recently had a chance to shoot a) the best two wide angles available at the moment, and b) shoot them against each other on the same camera body. This is not a direct comparison. There are however limitations to the testing – very limited time* and no way to mount one without. Furthermore, the lenses were both final preproduction prototypes, which could mean they are either good samples because they’re hand adjusted…or there’s some variance, because…they’re hand adjusted. Tests were performed on a Sony A7RII body mounted on a Arca-Swiss P0 head and RRS24L tripod – i.e. sturdy – and released via IR remote. The adaptor used was a Metabones Nikon G-NEX model, tested and found to be good with various other lenses including the Zeiss 28 Otus. However, it’s worth noting that the shorter the focal length, the more sensitive a lens is to small skew because only very small movements are needed to change effective focusing distance. I’m sure many other limitations in methodology can be found, but remember we are aiming for the best we can do in field conditions without giving one lens or the other a sensor-based advantage. Observations must therefore be taken as preliminary.

*Literally, about an hour after dark during a recent visit to Sigma HQ in Aizu, Japan. Crops are 100% where stated; I will not be posting full size images because IP rights sadly don’t seem to mean a thing online.

[Read more…]