I received a zoom lens for a whole EUR 10,- (~ USD 11,-) 
I found it on willhaben.at, the largest online platform for used items in Austria.
It was offered there with a few dim pictures:
Lens is untested and therefore declared defective. No guarantee or returns.
„Another repair project“ I thought to myself and prepared myself to order a wreck.
„If the bayonet ring is so dirty, what else would it look like?“ I thought.
After having received the zoom lens I unpacked it and was amazed.
An almost new piece stood in front of me. Apart from the bayonet ring, clean, no scratches and almost no dust on the lenses.
Gorgeous!
There is also a current Hoya UV filter, also in mint condition.
What a zoom!
All metal, heavy, no extension of the tube when moving through the impressive focal length range.
Focusing and zoom path are smooth, the aperture catch clicks brightly.
No issues detectable.
With joy …
... I started cleaning the bayonet ring and the area underneath.
How this greasy stuff came about - I don't know.
Removing the bayonet ring
After loosening the three bayonet ring screws, this spring connects the ring and tube.
It needs to be unhooked.
Under the bayonet ring
Bayonet ring removed, the arrow points to the spring retaining screw.
In order to be able to clean the ring more effectively, I remove the hood to the rear lens.
Zippo lighter fluid cleans things up.
I found it on willhaben.at, the largest online platform for used items in Austria.
It was offered there with a few dim pictures:
Lens is untested and therefore declared defective. No guarantee or returns.
„Another repair project“ I thought to myself and prepared myself to order a wreck.
„If the bayonet ring is so dirty, what else would it look like?“ I thought.
After having received the zoom lens I unpacked it and was amazed.
An almost new piece stood in front of me. Apart from the bayonet ring, clean, no scratches and almost no dust on the lenses.
Gorgeous!
There is also a current Hoya UV filter, also in mint condition.
What a zoom!
All metal, heavy, no extension of the tube when moving through the impressive focal length range.
Focusing and zoom path are smooth, the aperture catch clicks brightly.
No issues detectable.
With joy …
... I started cleaning the bayonet ring and the area underneath.
How this greasy stuff came about - I don't know.
Removing the bayonet ring
After loosening the three bayonet ring screws, this spring connects the ring and tube.
It needs to be unhooked.
Under the bayonet ring
Bayonet ring removed, the arrow points to the spring retaining screw.
In order to be able to clean the ring more effectively, I remove the hood to the rear lens.
Zippo lighter fluid cleans things up.
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