Dave... You are awesome!
Just got an oily Tak-bayonet 135 2.5 today and was amazed when it unscrewed as you said it would.
I actually had to put a large rubber band around the barrel behind the hood and mounted the lens on a TC
for extra leverage but it came loose. Cleaned with contact cleaner until front of blades was clean.
Hard to remove all oil from rear of blades but they work great now!
Just had to as another success story to this old thread.
If only all lenses were this easy to work on.
Originally posted by Just1MoreDave You are in luck. This lens has the easiest access to the aperture blades ever. I'm assuming your lens is the Takumar (Bayonet) 1:2.5 135mm. Focus the lens to its closest distance. Extend the hood. Grab the mount end with one hand and the exposed barrel between the hood and the focus ring with the other. That exposed barrel unscrews counter-clockwise.