Author Topic: AF-S Nikkor 28-70mm f/2.8: Impact injury - Faulty AF - Encoder pickup  (Read 1043 times)

Erik Lund

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The old warhorse AF-S Nikkor 28-70mm f/2.8 suffered an Impact injury about 8 yeas ago.

Since then it has been an ongoing project to repair it,,,  :o :o :o Today sucess  ;D

The cause was me kneeling down in just the wrong angle to empty the lens out of my Billingham West  >:(

First obvious thing was the Lens hood bayonet had cracked. So the spare came in hand  ;)

The focus ring had a small deep mar indicating point of impact as well this was to be repaired internally by dremel the bump away.

Still there was issues focusing and here I found the below two videos now and they give the answers to the rest of issues.

Faulty AF - Encoder pickup

https://nikongear.net/revival/index.php?topic=2193.0

and the internal flex board getting loose as well as details on wires etc.

https://www.youtube.com/watch?v=5SIsPnFG3pc&t=33s
So grateful  ;D

Make sure to see both videos first, will save you time in the end  8) As always
Erik Lund

Hugh_3170

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Erik, well done.  Nice to see a worthy lens back in action.

The old warhorse has revealed black plastic underneath the worn white areas.  Somehow I always imagined that white plastic parts were involved in these lenses. 
Hugh Gunn

Erik Lund

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Thx ;)

Yes it's a light grey color, just a thin coat on the worn piece the other parts have more of a light crinkle finish - Zoom and Focus rings are metal as well as the front and almost all of the internals as well.

I have always been very fond of the focal length spread 28mm to 70mm especially for PJ style work things tend to not look strange, as zoon as one comes close to 24mm on other lenses you have to take extra care for that 'distortion' of people and things in the corners.
Erik Lund

John Geerts

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Great Job, Erik.  Very long You Tube about the repair ;)

Erik Lund

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Thank you! Yes very thorough video - describing not only the repair in detail but also many of the associated parts functions, very educational and very Danish btw   ;D
Erik Lund

John Geerts

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Oh yes, lots of advices I never saw before,  the Loctite, the dentist equipment, the self made japanese screwdriver...    very interesting.

Erik Lund

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Seriously considering if this is worth it,,, Squeaky SWM to be fixed etc,,,
Erik Lund

Fons Baerken

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Interesting display of parts, good luck on your adventure!

Nasos Kosmas

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Interesting display of parts, good luck on your adventure!
+1
Oh my god! The last time I did that :o
My lens still waiting to be assembled 8)

Erik Lund

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The SWM just wont stop squaeking so not woth continuing, 28-70mm f/2.8 officially retired
Erik Lund

Dogman

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Re: AF-S Nikkor 28-70mm f/2.8: Impact injury - Faulty AF - Encoder pickup
« Reply #10 on: October 06, 2022, 20:52:34 »
A squirt of 3-In-One oil will fix that squeak right up. ::)
"If it's more than a hundred feet from the car, it's not photogenic."--Edward Weston

Erik Lund

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Re: AF-S Nikkor 28-70mm f/2.8: Impact injury - Faulty AF - Encoder pickup
« Reply #11 on: October 06, 2022, 21:24:14 »
I'm told the SWM needs to run dry since it runs partly on friction.
Erik Lund

Erik Lund

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Re: AF-S Nikkor 28-70mm f/2.8: Impact injury - Faulty AF - Encoder pickup
« Reply #12 on: October 06, 2022, 21:30:24 »
It's now an installation; Nikkor SWM f/2.8  8)
Erik Lund

Akira

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Re: AF-S Nikkor 28-70mm f/2.8: Impact injury - Faulty AF - Encoder pickup
« Reply #13 on: October 06, 2022, 23:24:26 »
Seriously considering if this is worth it,,, Squeaky SWM to be fixed etc,,,

Wow, Erik, this is quite a formidable project!  I'm floored!
"The eye is blind if the mind is absent." - Confucius

"Limitation is inspiration." - Akira

Chip Chipowski

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Re: AF-S Nikkor 28-70mm f/2.8: Impact injury - Faulty AF - Encoder pickup
« Reply #14 on: October 06, 2022, 23:42:43 »
HAL, is that you?   ;)