TenEleven
Well-known
I second what @Coldkennels says above - in fact my best performing (meaning in terms of sharpness at full aperture etc.) f2 Sonnar is in fact a Jupiter-8. I love my Jena Sonnars for their rendition but when I want all around sharpness from 2.8 I go for the Jupiter.
Also some of the bad rep these lenses get is also likely due to their L39/M39 screw mount versions having different rangefinder gain. (52.4mm VS 51.6mm) Yes the register distance is identical to the LTM standard but the gain is not. This means RF focus diverges for closer distances when used on a Leica or equivalent camera. Depending on the focal length/aperture the picture can even be entirely out of focus.
This is however not the fault of the lenses nor does it mean the optics are "bad" or that something has been done sloppily. The lens may very well work as intended -- on a Zorky, which is the camera that these were made for.
Also some of the bad rep these lenses get is also likely due to their L39/M39 screw mount versions having different rangefinder gain. (52.4mm VS 51.6mm) Yes the register distance is identical to the LTM standard but the gain is not. This means RF focus diverges for closer distances when used on a Leica or equivalent camera. Depending on the focal length/aperture the picture can even be entirely out of focus.
This is however not the fault of the lenses nor does it mean the optics are "bad" or that something has been done sloppily. The lens may very well work as intended -- on a Zorky, which is the camera that these were made for.