Details Voigtlander 40mm F1.4
Stages of disassembly of the front
- Unscrew the front black plate (1.1) with the inscription counterclockwise (I use a rubber ring for this)
- Unscrew the three small screws holding the chrome hood/filter mounting ring (1.2), then pull it out.
- Using a wrench, unscrew the outer ring of the front lens frame (1.3) counterclockwise.
Now you have access to the inside and you can easily clean the glass or aperture blades there. You can also disassemble the glass frame for replacement if needed.
Rear disassembly steps
Use a wrench and unscrew counterclockwise the ring that secures the lens core inside the helicoid.
Then pull out the optics assembly and set it aside. Now unscrew the four black screws holding the focus frame with distance indicators.
Now you can unscrew the two bolts holding the focus drive.
Grasp the rear lens barrel with a rubber band or gloves and unscrew the rear optics assembly counterclockwise.
Ready. You can clean the aperture blades and also lubricate the helicoid.