Removing the rear lenses for cleaning
Sometimes you get to your destination faster if you find the way yourself.
That was the case today
The rear lenses that need to be removed for cleaning.
I was able to rotate the ring around the lenses using the rubber cylinder.
But that didn't make any difference; the lenses stayed where they were.
The ring is made of plastic and elastic. Carefully prying it out didn't work.
So I had to disassemble the rear unit in order to remove the lenses.
Before doing this I documented the status.
This is the position in which the lens is screwed into the camera bayonet. Both red dots are aligned.
Three screws fix the rear assembly.
The rear lenses are now accessible.
There is a retaining ring here that is locked in place. It can be rotated, which is what I noticed at the beginning.
I carefully pry off the plastic ring.
Now the two rear lenses and an intermediate ring can be lifted out with the lens sucker.
The aperture is then free and can be moved.
Good to know in case I ever need to clean the aperture blades.
A composite lens that cannot be further disassembled.
Reassembly
After cleaning and reinserting the lenses, I clip in the retaining ring.
The aperture mechanism with three springs for adjusting the aperture and transmitting the aperture values to the camera.
These two elements must be coupled (red arrow).
Note the position of the aperture control curve (green arrow).
Sometimes you get to your destination faster if you find the way yourself.
That was the case today
The rear lenses that need to be removed for cleaning.
I was able to rotate the ring around the lenses using the rubber cylinder.
But that didn't make any difference; the lenses stayed where they were.
The ring is made of plastic and elastic. Carefully prying it out didn't work.
So I had to disassemble the rear unit in order to remove the lenses.
Before doing this I documented the status.
This is the position in which the lens is screwed into the camera bayonet. Both red dots are aligned.
Three screws fix the rear assembly.
The rear lenses are now accessible.
There is a retaining ring here that is locked in place. It can be rotated, which is what I noticed at the beginning.
I carefully pry off the plastic ring.
Now the two rear lenses and an intermediate ring can be lifted out with the lens sucker.
The aperture is then free and can be moved.
Good to know in case I ever need to clean the aperture blades.
A composite lens that cannot be further disassembled.
Reassembly
After cleaning and reinserting the lenses, I clip in the retaining ring.
The aperture mechanism with three springs for adjusting the aperture and transmitting the aperture values to the camera.
These two elements must be coupled (red arrow).
Note the position of the aperture control curve (green arrow).
Last edited: