Minolta MD 50mm f1.7 Disassembly Tutorial

Easy disassembly method for lens cleaning (mold removal)

Difficulty ★★☆☆☆


Things to prepare

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


Size comparison of economy standard lens. MD version on the left, older MC version on the right.


Using the name-ring removal tool, loosen the ring with the Minolta inscription by turning counter-clockwise.


Remove the three screws to remove the filter frame cover.


Remove the three screws and the front lens unit will come off.


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.

The red arrow mark shows that plastic parts have been incorporated with the diaphragm cam. From this era, it has been moved to the diaphragm ring and directly attached. A revolutionary structural change.

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.


Remove the three screws and remove the lens unit.


Pull out the rear lens unit.


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.


Optical diagram of the MD 50mm f1.7 lens.







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