Originally posted by Sandy Hancock Can you outline how you cleared your lens of fungus? One of my recent acquisitions looks like it needs some treatment....
Sure! So the lens only had fungus on one of the rear two elements, but inside the element assembly.
Unscrewed the 3 screws on base, remove mount section, remove ring for controlling aperture with lever.
Unscrew rearmost element assembly (containing two elements), unscrew front of those two assembly with lens spanner to free element.
Clean all with methanol (using safety precautions) to remove fungus (though I could also have used hydrogen peroxide, typically 12%). Leave dry, clean again with naphtha, leave dry. Rub carefully with dry, clean micro fibre cloth.
Blower inside assembly in relatively dust free environment to remove any stray dusts.
Reassemble in reverse.
I’ll also look to remove the front element and clean that as there’s some light oil spots or dust visible, but after I buy some lens removal rubber rings.
There’s usually some good disassembly guides online (I prefer YouTube ones as I cope well with visual learning). A good set of JIS screwdrivers is paramount, as is a lens spanner. To be clear, this was my first lens disassembly and it went smoothly. Just take your time and I’m sure you’ll have zero issues.