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

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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.

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An exclusive interview with Kazuto Yamaki, CEO, Sigma

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I recently had the opportunity to spend some time with Sigma global CEO Kazuto Yamaki during his visit to Kuala Lumpur for the dp0 Quattro launch, courtesy of regional distributors APD. What followed was a most interesting and candid discussion during which it became clear to me that he has a very adroit handle on things and a remarkable philosophy. I believe Sigma is going to be one of the companies that not just survives the market slowdown, but may well come out benefitting from it. Here’s why.

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Review: The Sigma DP2 Quattro

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Normally, we  look at a camera from a holistic point of view and compare it to the competition or the class leader. This unfortunately doesn’t make sense for extreme outliers like the DP2Q; we’ll have to do something a bit different. This review will look primarily from the point of view of image quality, and whether we can live with everything else. This is the opposite from every other review I’ve written to date, and the reasons for this will become clear soon enough. The other big change will be considering workflow and software as part of the camera package: it’s impossible to do anything else, since unlike every other camera, there is no universal workflow we can apply. Those of you who do not like caveats, are unable to look at something objectively, or are not open minded, I suggest you save yourselves some angst and stop reading now.

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Review: The Sigma DP3 Merrill

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You’re probably wondering why this DP3M doesn’t look anything like the press release photos – my friend attached a RRS grip and plate to it, and rightly so; without it, the camera is not very comfortable to hold.

I eventually caved to both pressure and curiosity, and borrowed the Sigma DP3M from master printer and good friend Wesley Wong – who has the DP Merrill in all three flavors. In case you’ve been living under a rock for the last few years, Sigma has been going their own way with the DP series of large sensor compacts; all of their cameras now share the same 14.7 MP (effective) three-layered Foveon sensor, with a 4.99 micron pixel pitch and true color/ true resolution information across all photosites. In a nutshell, the difference between Foveon and Bayer sensors is that the former records actual RGB values for each pixel, but the latter only records R, G or B, interpolating the other values from neighboring photosites. It’s difficult to determine precisely just how much resolution loss Bayer interpolation causes, but in my experience it seems to be around 50% or so. Sigma claims that the camera has the equivalent of 46MP (being 15.3 total MP x3 layers) – but this is really pushing it; images upsampled this far simply do not have the pixel-level ‘bite’ of a good Bayer file.

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