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Autofocus Anything – Techart Pro autofocus adapter with Zeiss manual focus lenses


From the earliest days of the mirrorless movement, photographers have enjoyed the ability to adapt manual focus lenses made for various legacy camera mounts to their new systems. With their electronic viewfinders and focusing aids, mirrorless cameras are uniquely suited for the task of manual focusing older lenses. As one of those early adopters, I adapted every rangefinder or legacy SLR lens I could get my hands on.

The results were satisfying but manual focusing can be challenging for moving subjects or for those with poor eyesight. Thanks to the technology in the new Sony Alpha series mirrorless cameras – specifically those cameras with on-sensor phase detection autofocus – and the ingenuity of a small company in Hong Kong, we now have the ability to autofocus almost any manual focus lens manufactured over the past 75 years for the 35mm format.

This wizardry is delivered via a new smart adapter called the Techart Pro – I’m calling it TAP for short – for Sony’s latest generation of phase detect autofocus (PDAF) cameras: the a7RII, a7II and a6300. Don’t bother trying it with any previous Sony models but we might assume that future Sony PDAF cameras should be compatible. Out of the box, the adapter supports lenses made for Leica M mount, but due to the short flange distance of that platform, there is plenty of room for an additional adapter to stack on the TAP, thus increasing the mount compatibility to support: ALPA, Canon FD and EF, Contarex CRX, Contax/Yashica (C/Y), DKL, Exakta, Leica R, M42, Minolta MD, Nikon F, Olympus OM and Pentax K. These additional adapters can be purchased from Techart or perhaps more cheaply on eBay or Amazon. The TAP itself costs $349 and can be ordered directly from the manufacturer.

The manufacturer claims that TAP can focus a lens as large as 700g but for my purposes, I’m primarily looking at small and light rangefinder lenses as they maximize the compact potential of mirrorless. For this review I’m using the following selection of Zeiss ZM lenses:

  • Zeiss 35mm f/1.4 Distagon T* ZM
  • Zeiss 35mm f/2.8 C Biogon T* ZM
  • Zeiss 50mm f/1.5 C Sonnar T* ZM
  • Zeiss 50mm f/2 Planar T* ZM
  • Zeiss 85mm f/4 Tele Tessar T* ZM

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Phase Detect Autofocus with Carl Zeiss Contax G lenses on the Sony a7R II

***UPDATE*** On October 7th,2015 TechArt released v2.1.0 of the firmware described in this post that remedies many if not all of the problems with the initial release. Read on for my original review. I have made edits throughout the text to reflect the new version.

On August 29th, TechArt, maker of the Golden Eagle Contax G to Sony E adapter quietly updated their firmware to support the Sony a7R II. Originally the adapter did not work with the new camera so I contacted the folks over at TechArt hoping against hope that they would soon have a solution. An individual named Lau wrote me back, assuring that an update would be released before the end of August. True to their word, on 8/29 the new firmware v2.0.0, popped up in the TechArt Update app for iOS (download here for iOS and Android). But they didn’t just fix what was broken, they also added support for the 399 fast phase detect sensors on the a7R II!


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