While the lens does resemble a bolt on a drain pipe I am super impressed with the quality of the images. Yep, I find it damn tricky to focus if handholding, but its fine on a tripod. Annoyingly two images I had high hopes for are out of focus. I shall just have to go and reshoot. The lens is also odd in operation in that the aperture ring is at the font of the lens and is set to the side rather than viewable on the top.
Jupiter 11 Lens – first shots on my Canon 5d IV
“The Jupiter-11 135 mm f/ 4 (Russian: “Юпитер”) is a medium prime tele lens with a single-layer coating for film SLR cameras with the m39 screw mount.
The export variant of the lens was named the Jupiter-11,135/4
Real focal length: 133 mm
The lens is a Soviet replica of the German Carl Zeiss Jena Sonnar T 135 mm f/ 4
The Jupiter-11,135 mm f/ 4 is characterized with a very compact size, with a nice Sonnar blur of confusion zones* (mainly due to the 11-blade iris aperture), rather good resolution and contrast.” AllPhotoLenses
*they mean bokeh.