Going further, I think this lens could be similar to Soligor on
this link (5'54").
There are traces of glue visible between large washer and front plate (with text) that holds the secondary mirror.. so I am guessing the acetone soak will help again to dismantle this assembly and free the front lens for proper cleaning.
EDIT:
there was no need for dismantle, all fungus is gone with help of Windex and microfiber cloth.
Quote:
Originally Posted by Leo.G
DO you have an adjustable tool for removing the rings?
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Usually I make the tool (from old handsaw blade), but for this job I am using caliper...