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LENSTORATION: Broken Aperture Mechanism on the Vivitar 28-85/2.8-3.8


Broken Aperture Mechanism on the Vivitar 28-852.8-3.8
Broken Aperture Mechanism on the Vivitar 28-852.8-3.8



July 5, 2017

It's finally here, the Vivitar 28-85mm f/2.8-3.8 by Kino Precision! It's the original one before Vivitar came up with a later Series 1 version of this made by Komine (I had both). This lens is an impeccable performer, better than the later Komine version.

Before that, I had to do some fixes to the lens. I do not know what is inside, but this photo tutorial is a personal study for me.


Requirements:

1) Needs cosmetic cleaning from external grime, cleaning the markings, etc.

2) The rear group and second group on the front had some oil residue on them. Hopefully, not the middle section of the lens, so I don't have to take it apart thoroughly.

3) The blades don't open or respond when I turn the aperture ring. I'm sure, there's some disconnected parts inside. I'm nervous and hope this is just minor and can be fixed.


Broken Aperture Mechanism on the Vivitar 28-852.8-3.8

Broken Aperture Mechanism on the Vivitar 28-852.8-3.8
The blades don't open or respond when I turn the aperture ring.
Something's disconnected!

Broken Aperture Mechanism on the Vivitar 28-852.8-3.8
First, remove the 3 screws holding the body's barrel in place.

Broken Aperture Mechanism on the Vivitar 28-852.8-3.8
Once removed, it will reveal another 3 sets of screws
that hold the aperture ring and mount in place. Unscrew these.

Broken Aperture Mechanism on the Vivitar 28-852.8-3.8
Once unscrewed, you can now take it apart.

Broken Aperture Mechanism on the Vivitar 28-852.8-3.8
On the far right, you will see the aperture lever that moves the aperture blades to close/open.
Just put it back and make sure it is aligned so that the blades are responsive
when you turn the aperture ring.

Broken Aperture Mechanism on the Vivitar 28-852.8-3.8
Now the front group needs some cleaning.
First, unscrew the front group with a spanner wrench.
The filter thread (top left) can be removed
by the 3 sets of screw holding it in place.
The first group is clean so I leave it alone.
This reveals the second group (right), which needs cleaning.

Broken Aperture Mechanism on the Vivitar 28-852.8-3.8
The rear glass needs some cleaning too.


Now the lens is clean and you can reassemble it.




Links

Vivitar 28-85mm Photo Album

Vivitar Series 1 28-90mm f/2.8-3.5 (Komine)

Vivitar Serial Number Lookup
Reviews

Service Manual for Vivitar 28-85/2.8-3.8

Quote: One of the sharpest and highest resolution varifocal lenses ever made


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