Minolta MD 50mm f1.7 Installation instructions

MINOLTA
MD 50mm f1.7 Lens Disassembly Tutorial
Easy disassembly method for lens cleaning (mold removal)
Diculty: ★★✩✩✩
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
lenses. MD version on the left, older MC
version on the right.
These tutorials originally appeared on a now-defunct Japanese website. A German website dedicated to the
Minolta manual focus system had copied the pages and kept them online after the original Japanese site
closed up, but the tutorials were written in Japanese.
We’ve translated them into English and are posting them on the Learn Camera Repair website so that they’ll
be available to English-speaking users, and to keep them available if the German site ever goes dark. You can
see the original Japanese versions on the Minolta SR Site: http://minolta.eazypix.de/index.html

Using the name-ring removal tool,
loosen the ring by turning counter-
clockwise.
Remove the three screws to remove the
lter frame cover.
Remove the three screws to remove the
lter frame cover.

Turn the lens over and remove the rear
lens cap.
If you remove the four screws on the
lens mount, the lens mount will come o
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 o, 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.

Clean with lens cleaner and paper. First,
don’t forget to blow o the dust with a
blower!
The front and rear lens groups sand-
wiching 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 can be
scratched easily.
Optical diagram of the MD 50mm f1.7 lens.
Pull out the rear lens unit.