Jupiter 12 35 mm f/ 2.8 Lens サービスマニュアル

 

OK, 4 J8’s in need of attention for $12, how could I refuse. When they arrived, they were of 4 
different sorts and boy did they need attention! 

 

 
The 4 J8’s. The first one (from the left) is similar to the black ones. When you focus the whole front 
rotates. Note the printed depth of field scale that has just about worn away. The second one is 
similar in construction to the J3. Note the cap shown by the arrow. This relies on a second helix to 
keep the front of the lens from rotating. The third and fourth ones are similar in construction to the 
Industar lenses and rely on a pin to stop the front rotating. The only difference between these two is 
the focus tab. 
 
Servicing the focus unit of each is different but the lens units are very similar. I will cover the re-
lube of each of the focus units first and then cover the lens unit before some words on collimation. 
 
LENS 1 

 

Firmly grip the lens unit and unscrew it 
from the focus unit. Notice the alloy 
shims. Put the lens unit to one side and 
don’t lose the shims!