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Kiron 2/28mm disassemble
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PostPosted: Sun Mar 20, 2011 12:08 pm    Post subject: Kiron 2/28mm disassemble Reply with quote

Did anyone succeed in reaching the blades? I am stuck on both ends where there is still a piece of glass left. You can see the force used to unscrew last lens tubes has torn holes i made. It still wasn't enough. I guess some glue was used. Any experience? Possibly different direction to unscrew? Any help will be highly appreciated.

As always some internal dust made me go that (too) far. It's also sought after Nikon mount Sad.








PostPosted: Sun Mar 20, 2011 1:55 pm    Post subject: Reply with quote

The rear element should not be too difficult to screw off(at least in the two copied I owned). If you cannot screw off it off, try to apply smalll amount of organic solvents to the circled area.


PostPosted: Sun Mar 20, 2011 4:41 pm    Post subject: Reply with quote

That's important advice giving me hope. Do you remember the direction to unscrew perhaps?


PostPosted: Sun Mar 20, 2011 4:48 pm    Post subject: Reply with quote

Made it! Nail polish remover and counter-clockwise. Thanks!


PostPosted: Mon Mar 21, 2011 4:22 am    Post subject: Reply with quote

Pancolart wrote:
Made it! Nail polish remover and counter-clockwise. Thanks!

Great to hear that. Wink


PostPosted: Sat Jan 03, 2015 8:15 pm    Post subject: Reply with quote

Hello,

Sorry to bump such an old topic. I have a Kiron 28mm f2 with oil on the blades. I dismantled it and could clean the blades (lots of alcohol.. Laughing ); the aperture is now operating well.

However I would like to clean the front lens; do you know how to dismantle the front lens?

Blades before/after:



Dust (and maybe a little bit of fungus?)


Where I am right now in the dismantle operation, I removed the circlips surrounding the aperture plate: (I see no screws)


Hoping for help,
Bye!

EDIT: In preview mode links/images are showing, but my post is broken Sad

Code:

http://forum.mflenses.com/userpix/20151/8733_before_1.jpg
http://forum.mflenses.com/userpix/20151/8733_after_1.jpg

http://forum.mflenses.com/userpix/20151/8733_dirty_1.jpg


http://forum.mflenses.com/userpix/20151/8733_dismantling_1.jpg


PostPosted: Sat Jan 03, 2015 8:48 pm    Post subject: Reply with quote

Vicolaships wrote:
Hello,

Sorry to bump such an old topic. I have a Kiron 28mm f2 with oil on the blades. I dismantled it and could clean the blades (lots of alcohol.. Laughing ); the aperture is now operating well.

However I would like to clean the front lens; do you know how to dismantle the front lens?

Blades before/after:



Dust (and maybe a little bit of fungus?)


Where I am right now in the dismantle operation, I removed the circlips surrounding the aperture plate: (I see no screws)


Hoping for help,
Bye!

EDIT: In preview mode links/images are showing, but my post is broken Sad

Code:

http://forum.mflenses.com/userpix/20151/8733_before_1.jpg
http://forum.mflenses.com/userpix/20151/8733_after_1.jpg

http://forum.mflenses.com/userpix/20151/8733_dirty_1.jpg


http://forum.mflenses.com/userpix/20151/8733_dismantling_1.jpg


repostes so the pictures show, it's just an anti spam measure.


PostPosted: Sun Jan 18, 2015 1:31 am    Post subject: Reply with quote

Vicolaships wrote:
Hello,

Blades before/after:
[url=http://forum.mflenses.com/userpix/20151/8733_after_1.jpg]


The blades aren't supposed to close this deep.


PostPosted: Sat Feb 09, 2019 10:04 pm    Post subject: Reply with quote

2019!

I'm having issues with access to the front of the diaphragm.

Simply can't remove the front groups completely. I got as far as the OP in the front, the rear was no issue.

I see another post where someone else posted before and after photos.. with the front of his aperture blades de-greased.. but.. his front group is visible in both photos. Did he simply clean the front and rear.. from the rear? (soaking in degreaser?)

It seems to do a proper cleaning the entire aperture assembly should be removed.. and that is where I am stuck. Removal of the aperture assembly has to be done from the front!


PostPosted: Sun Feb 10, 2019 7:18 am    Post subject: Reply with quote

sixece wrote:
I'm having issues with access to the front of the diaphragm.

Simply can't remove the front groups completely.


This lens is like 20% thread locker by weight. So acetone, lots of acetone and a strap wrench. Eventually the threads will budge.