We have a separate showcase for the 8.5cm F2 KMZ Jupiter-9, and rightfully so. The optical formula changed, the type of glass changed.
The J-9 is a classic 7 element in 3 group, 1-3-3 configuration. It is undercorrected for spherical aberration, renders more smoothly than the Nikkor 8.5cm F2.
This is an export version of the LZOS 85mm F2, 1967 date. This one is in near-mint condition. J-9's are difficult to bring into agreement with the Leica RF, this one is good from 1.5m to 20m. After that, slight back-focus at 1.15m, and slight front focus at infinity. Enough to require some manual compensation at F2. But not hard to learn.
Manufacturer Logos here:
ACP - Logos
All shots wide-open, on the M9. Many are at 1.15m, minimum focus for the J-9. About 0.5" required to compensate for focus with the RF.
The J-9 is a classic 7 element in 3 group, 1-3-3 configuration. It is undercorrected for spherical aberration, renders more smoothly than the Nikkor 8.5cm F2.
This is an export version of the LZOS 85mm F2, 1967 date. This one is in near-mint condition. J-9's are difficult to bring into agreement with the Leica RF, this one is good from 1.5m to 20m. After that, slight back-focus at 1.15m, and slight front focus at infinity. Enough to require some manual compensation at F2. But not hard to learn.
Manufacturer Logos here:
ACP - Logos
All shots wide-open, on the M9. Many are at 1.15m, minimum focus for the J-9. About 0.5" required to compensate for focus with the RF.
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