Robert



I think the front piece you want to remove unscrews. But look for a lock
screw anyhow.

You can remove it by using a piece of rubber like a jar cap opener to create
a grip.



You may not have to remove it if you can clean the blades.

The way I do it is to get a Q tip and use Ronsonol aka naptha.

It does not mess up plastics.

Dampen the Qtip and apply gently in the direction of the blade overlap so
you don't bend the blades. Use a dry Qtip to remove excess. Let it dry and
apply/exercise a few times until you are satisfied with it. Then clean the
lens. The Ronsonol dissolves the oil so that it can be picked up by the dry
Qtip. If all works well it actually cleans both sides



LOU



_____

From: NikonRepair@yahoogroups.com [mailto:NikonRepair@yahoogroups.com] On
Behalf Of Robert
Sent: Thursday, May 15, 2008 4:33 PM
To: NikonRepair@yahoogroups.com
Subject: [NikonRepair] nikkor 50 f1.8 blades cleaning



Hi,
I took a lot of pictures during a wind+sand storm, and after the photo
session i noticed that a lot of sand entered inside my nikkor.

I decided to unmount the lens and clean it. As expected the lens was
full of sand.
After the cleaning i put some oil, but i let a drop fall inside the
aperture blades..

The blades are stuck, because of the viscosity of the oil. I unmounted
the rear group lens and started to clean the blades from the back :

http://www.stockblo <http://www.stockblog.it/extra/bladesback.jpg>
g.it/extra/bladesback.jpg

You can spot some oil from this picture :

http://www.stockblo <http://www.stockblog.it/extra/front.jpg>
g.it/extra/front.jpg

I need to access the blades from the front, but i don't know how
unmount the front group of lens :

http://www.stockblo <http://www.stockblog.it/extra/how.jpg>
g.it/extra/how.jpg

can please someone give me a hint?

thanks
Robert





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