Minolta MD 50mm f1.4 Disassembly Tutorial

Easy disassembly method for lens cleaning (mold removal)

Difficulty ★★☆☆☆

 

Things to prepare

  • JIS cross-point precision screwdriver
  • Flat-end precision screwdriver
  • Rubber name-ring removal tool
  • Kitchen rubber gloves
  • Blower or compressed air
  • Lens cleaning paper
  • Lens cleaning liquid (lens cleaner)

 

The lens, with its dedicated lens hood.

 

Using the name-ring removal tool, loosen the ring with the Minolta inscription.

 

Press down and remove counterclockwise.

 

Loosen the two screws marked the red arrow that were hidden under the decorative ring.

 

Grab the filter holder frame with rubber gloves and remove it counterclockwise.

 

Remove the front lens unit, which is fixed with three screws.

 

Turn the lens over and remove the rear cap.

 

If you remove the four screws on the lens mount, the lens mount will come off as a unit.

Note! When the aperture ring is lifted, it will come off, but at this time the spring of the click stop will bounce and the tiny bearing will tend to go missing.

 

After gripping with rubber gloves, remove the group lens unit counterclockwise.

 

Clean with lens cleaner and paper. First, don't forget to blow off the dust with a blower!

The front and rear lens groups sandwiching the aperture are in a "unit structure" housed in a metal tube. The lenses facing the outsides of this unit are hard coated, so it is okay to clean them, but if you disassemble it, the lenses on the inside are soft and scratch easily.

 

You can prevent backlash (rattle) of the distance ring by shimming the straight helicoid key with thin plastic.

 

Optical diagram of the MD 50mm f1.4 lens.

 

 

 

 

 

 

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