The Giant Sunflower was shot with the legendary Carl Zeiss Olympia Sonnar 180mm f/2.8 lens for the Contax/Yashica mount, Made in West Germany in 1987.
The Sunflower was partly shot with the Olympia Sonnar adapted to a Sony a7ii full-frame camera
The Zeiss Mutar II 2x Tele-Converter was inserted between the Carl Zeiss 180mm f/2.8 lens with Contax/Yashica mount and the adapter between Contax/Yashica-mount and Sony e-mount. The usage of the Zeiss Mutar doubles the focal length from 180mm to 360mm.
The remaining Sunflower photos were shot with the Olympia Sonnar Carl Zeiss 180mm f/2.8 lens adapted to a Sony a6100 APS-C camera
When the Olympia Sonnar Carl Zeiss 180mm f2.8 German is used on a Sony a6100 camera with an APS-C sensor, a crop-factor of 1.5 applies. That makes the field of view almost the same as a 270mm lens used on a 35mm equivalent full-frame camera like the Sony a7ii.
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Sophisticated Carl Zeiss Mutar II 2x Tele-Converter
On the Sony a7ii full-frame camera, the Olympia Sonnar Carl Zeiss 180mm f/2.8 lens was used with the T*-coated Carl Zeiss Mutar II 2x tele-converter which is inserted between lens and the mount-adapter to double the focal length.
For Contax lenses with smaller focal length, Zeiss recommends to use the T*-coated Mutar I tele-converter. The Carl Zeiss Mutar II tele-converter is optimized for Contax tele-lenses with longer focal length.
Rundown
In my view, the image quality and very creamy bokeh which is typical for Sonnar lenses does not get lost, when shooting the super-sharp Olympia Sonnar Carl Zeiss 180mm f/2.8 lens with the sophisticated Mutar II 2x tele-converter adapted to a Sony a7ii full-frame camera, as you can see in above gallery photos. The in-body stabilization of the a7ii was set to 350mm focal length.
Zeiss is even going so far, to make the impression that the image quality of Carl Zeiss T* Contax lenses when using the Mutar T* tele-converters should be comparable to the original Contax lens (German quote: “Bei Kombination von Mutar T*I (2X) oder Mutar T*II (2X) und Carl Zeiss T*-Objektiven wird eine Bildqualität vergleichbar derjenigen des Objektivs allein erreicht“).
Shooting the Olympia Sonnar Carl Zeiss 180mm f/2.8 lens adapted to a Sony a6100 APS-C camera, works also well regarding image quality and creamy bokeh. This Sonnar lens deserves a test adapted to cameras with higher resolution sensors like the 42 mega-pixel on a Sony 7Riii.
Zeiss Olympia Sonnar 180mm f2.8 lens adapted to a Sony a7ii full frame camera
Olympia Sonnar Carl Zeiss 180mm f2.8 lens Made in West- vs East-Germany, which is better?