Nikkor 135 AF DC f/2 D

[Akira]

These extension hoods vary slightly in their threads. I have units that will not fit together while other do just fine. Apparently it is the front threads that differ as they all fit the polariser or gel filter holder mounted in single.

I didn't know that.  My two samples fits together with no problem...

[Bjørn Rørslett]

I think must have 5 or so, and only 2 of them allow stacking.

[Hugh_3170]

As well as the long Heliopan 72mm hood, the B&W Model 960 (72mm) should work, as well as the longer 72mm Chinese lens hoods advertised on Ebay.  The latter are relatively inexpensive and ones that I have tried have been quite satisfactory.  At under $20 each, there is less at stake if you go on to shorten them if vignetting arises.

[Erik Lund]

Your absolutely right Hugh!

[Jakov Minić]

Testing the blur circles 

[Bjørn Rørslett]

Jakov: your lens is dirty and needs a good spring cleaning ...

[BW]

Why not start a thread? General maintenance or spring cleaning of camera gear? Not as ambitious as opening lenses, but the day to day maintenance. Or is that to basic for this lot?

[stenrasmussen]

Why not start a thread? General maintenance or spring cleaning of camera gear? Not as ambitious as opening lenses, but the day to day maintenance. Or is that to basic for this lot?

Very good idea Børge!

[elsa hoffmann]

Why not start a thread? General maintenance or spring cleaning of camera gear? Not as ambitious as opening lenses, but the day to day maintenance. Or is that to basic for this lot?

yes please please

[Almass]

Yeah, Yeah, Yeah.......Spring Cleaning (Submerged by popular request) for my 135D.......Blow Dry to follow 

[Bjørn Rørslett]

That'll take due care of any external grime and dust. However, to get it cleaned properly inside perhaps it should be submerged?

[Almass]

That'll take due care of any external grime and dust. However, to get it cleaned properly inside perhaps it should be submerged?

This is before "submersion".......

[Almass]

This is after "submersion".......

[Jakov Minić]

I solemnly declare that I adore this lens!
This is a front focus shot.
It goes without saying that the lens is extremely sharp 

[Edit]
The second shot that I am just adding is the same seen with some parts in the plane of sharpness.
Shot at f/2.0, the DC set all the way to F.

[Jakov Minić]

Jakov: your lens is dirty and needs a good spring cleaning ...

Bjørn, makes me laugh all the time 
I wonder where all that dirt comes from a brand new lens...