This lens has a similar construction with other Takumars, except for the internal filters. I have removed the UV internal filter since it contracted a bad case of haze.
Remove the name plate (A) with friction tool the usual way. Make sure the tool will not touch the bulging front element. My favourite tool, a Pentax rear lens cap & rubber glove (C) do this job nicely. Then remove the 3 screws holding the filter selector ring (B).
Once the filter selector ring (A) was removed, remove the 3 headless screws (B) holding the indicator ring. Remove the 3 focus screws & washer set (C), then remove the focusing ring.
Remove the 3 headless screws (A) holding the aperture indicator ring. Also remove the focus limiter screw (B). Then remove the aperture selector ring (C). As usual, beware of the booby trapped ball bearing.
Remove the 3 screws (A) holding the front and back part together.
To remove the front lens group, first remove the 2 tabs (A), and turn the front group. On reassembly, rotate the front lens group you could :
1. Align the cutout (B) with a piece of metal on the inner side of the back. The metal act as a spring for the aperture click ball
2. Insert the aperture lever (C – not visible) into the F shaped part of the aperture mechanism (C – not visible) bearing.
These are the parts after the front lens group was removed.
To access the internal filter, use a lens spanner to remove the front lens group from the helicoid. The internal filters are held in place by metal retainers.
To access the rear lens group elements, remove the filter holder (A), well a friend told me its some sort of filter holder, although I have no idea what kind of filter will fit into this. Next remove the rear cap (B).
Use lens spanner to remove these rings (A & B) if you need to access the rear elements.
Tips on reassembly :
A. Adjust the lens groups so it doesn’t press on the rear aperture assembly. Else the aperture might get sluggish or won’t move at all.
B. Focus adjustment. Put the front lens group to its minimum distance. Set the 3 focus adjustment screws, but do not tighten them yet. Turn the focus ring to infinity. If you don’t get infinity focus, loosen the focus adjustment screws and slide the focus ring around.