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Focus hunting problem in AF-s Nikkor 24-70mm 1:2.8 G ED___Maybe dirty magnetic encoder tape

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My AF-s Nikkor 24-70mm 1:2.8 G ED had really problems with the autofocus, because it try to find the correct focus by hunting many time before it now and then hit the correct spot.
NOTE: Do NOT use any metal tool's too close the magnetic tape you will probably damage the info on Magnetic tape..
I found out that it was the magnetic tape and the GMR sensor head that also is part of the autofocus system, thoose 2 part's was really dirty, but after I clean the surface on both parts with Isopropylalcohol 99% on a PEC-PAD lens tissue and a cotton bud, it turned out to be a BIG succes.
After the repair was done, I went out and do some test with the lens on my Nikon D3s and the focus was spot on every time :-)
You can get some Nikon or Nikkor repair or part's manual's here: arcticwolfs.net/
Here are some link's to different repair tool's:
Contact glue:
www.loctitepro...
Japan Hobby Tool rubber cone:
www.amazon.com...
18 different size rubber repair tool's:
www.amazon.com...
You can also buy this set.
Lens Repair Set with pointed, flat, half flat tips:
www.amazon.com...
JIS cross head screw driver's:
www.amazon.com...
Or this set, that is the set I use:
eustore.ifixit...
Lens cleaning wipes (PEC-PAD):
www.amazon.com...
Thin Cotton Buds x 200 you can buy them here:
www.muji.eu/pa...
DSLRKIT Pro Lens Vise Tool Repair Filter Ring Ajustment Steel 27mm to 130mm:
www.amazon.com...
Japan Hobby Tool Helical Grease Made in Japan:
www.amazon.com...
Loctite 222 50ml Threadlocker
www.amazon.com...

Опубликовано:

21 авг 2024

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Комментарии : 35

@stephenladeji1572 2 года назад

Really useful helpful video, followed the steps exactly and now my 24-70 g is back in working order - many thanks!

@mikeno62 2 года назад

That's really great Stephen :-)

@MrJFMH 2 года назад

Thank you very much mike! I've repaired my Af-s 24-70 using this video turorial. :)

@mikeno62 2 года назад

WOW, that's really good Jean.

@empireages241 6 лет назад

Hi, another good video from you :) I have a nikkor 27-70 ed VR which is completely different from yours. I have used the service manual to dismantle the lense until i was at the steps requiring alignment. It is an easy process but be EXTRA CAREFUL with the cables in this unit, their are so thin that they break the solder connection in no time without forcing... the ribbon cables are more robust that this AF button cable. So be careful or you will need to do a soldering jobs to repair the mess. (I dismantled this lense because it was blocked in the 35-50mm range. the problem is easy, one screw getting loose somehow in the zoom mechanism, need to follow all the steps of the manual until you need an alignment , fix the screw, assemble everything and done). My contribution

@mikeno62 6 лет назад

It's really good that you could fix your lens :-) I think it must be the AF-s VR Nikkor 28-70mm 1:2.8 G ED you mean (there is no AF-s Nikkor 27-70mm....). Some of the AF-s Nikkor lenses have problems with loose screws in the zoom section. I think they miss the screw thread lock on the 3 screws in the very front of the zoom section, I have repaired many AF-s Nikkor 24-70mm 1:2.8 G ED that actually had that problem. You are right that it's not that "hard work" to fix, but of course one have to take good care of the flex cables, and NOT working too close to the GMR sensor unit and the magnetic GMR focus tape. Cheers Kenneth

@felix7271441 5 лет назад

Thank you ,I have repair my 24 70 for the same problem!

@ScottishATeam 5 месяцев назад

thank you great video

@y2ktube 3 года назад

Video @ 7:33 "a bit fragile" ? Talk about an understatement ! - I wonder how many folks out there became brave enough to follow this video and ended up tearing the "fragile" flex ?

@sz2387 Год назад

hi. your video looks magic. your skill and this video is great. recently, i tried to repair my nikon af-s 70 300 vr lens but when i reassembled lens, focus hunting trouble happened. i dont know why but now i think your video may helpful for me. but... did you think contamination could be happen by just touching GMR unit? (i used latex glove..) i didnt touched magnetic tape, and GMR looks clean..

@jmichel70 Год назад

Thank you,

@allys537 5 лет назад

Most sources, like lens rentals say if you touch a GMR sensor with ANYTHING it will kill it rendering it useless, so how does one change a GMR sensor?

@geofunvideos 6 лет назад

Thank you for another great tutorial :)

@smartlemming4564 3 года назад

Hi Mike, Thanks for this, I got a very cheap 24-120 f4 as the zoom ring was 180 degrees out and stuck,I stripped it and got it working but the focus was hunting badly and I put it down to the two wires I soldered in to replace a broken ribbon going from CB to motor but after watching this stripped it again and cleaned all the tracks and the "tape head" and after reassembly working great, so thanks. PS are you Norwegian? Cheers Chris

@mikeno62 3 года назад

Thank's Chris, I'm glad the video could help you. I'm actually from Denmark and my name is Kenneth :-) Cheers Kenneth

@rahalati 3 года назад

Thanks for the video. My lens was having problem autofocusing, but at the end it manages to autofocus. Now it reached a stage where it is completely not being able to autofocus at all. I took it to Nikon dealer and he said the motor is most likely the cause and needs to be replaced and never mentioned the possibility of being dirty. The dealer said that if it were dirty, it should at least make some noise when it tries to autofocus. What do you think? Any help please

@rahalati 3 года назад

Any comment or help on what I said!!!!

@nasretdinsaliev5156 5 лет назад

Thank you bro!

@rahalati 5 лет назад

Thanks, that was helpful indeed

@rwphoto56 10 месяцев назад

Thank you, do you have a video on fixing the autofocus Nikon 400 mm 2.8 AF-S lens? Thanks,

@shtookatz 7 месяцев назад

What you're cleaning is not magnetic, it is just plastic with numbers on it. The magnetic part is the metal ring the GMR unit (square silver thing) is resting on under the numbers.

@lucamarchesin9498 4 года назад

Hi, I heard that the focus ring whistles also in your lens, do you know how to solve this problem? By cleaning some parts? Thanks for the video !

@y2ktube 3 года назад

The orbital motor needs to be replaced; no cleaning or lube solves this very common 'mileage' issue. * "Mileage" = Worn Out...

@miguelaviles2391 3 года назад

thank you so much! I was thinking of buying a new lens after my auto focus stopped working on my lens. I notice through the focus scale view window, this type of felt like looking string (sealer or washer?) floating around. With your detailed instructions, I was able to get in the lens remove that floating material. it seems that sealer had some gray lube went everywhere which I had to clean. My lens is now auto focusing! thank you!!! I have one question. During your instruction I did not notice where that felt like looking sealer or washing came from. what could that possibly be, and should I be worried?

@user-ju9hg9er8w 2 года назад

🖤

@RobertRafai 2 года назад

Hi Kenneth, I got same lens and want to ask you one thing. As you have much more experience than me in lens repair, I need some help. I borrow my lens to other and he hit front edge of the zoom which is moving in and out when you zooming, may be he drop it without lens hood on it. Now I have blurry images on one half of frame. I'm not sure what can be a problem. May be he damaged or bend screws which lead helicoid parts inside or focus coupling key is distorted?

@rahalati 3 года назад

I hope you can answer my question! If the cause of the problem is magnetic encoder tape, does the lens make noise when it tries to focus (focus hunting)?

@mikeno62 3 года назад

Well, it could be the SWM focus motor that is on the way to worn out, sinces the capacitive painting inside the motor is on the way to worn out (new motor..) (it's what I would guess)

@berriesmith317 3 года назад

You never disconnected the focus brush under the focus ring in the video You never took the zoom key off the zoom ring These are things you missed in the video

@deadmolecule3236 2 года назад

I have a same lens and had the same issue and Nikon charged me half a grand to replaced the SWM. Now the manual focus is stiff and Nikon wanted another half a grand to have the 2 year old SWM replaced. The lens works well except the manual focal is still, is there a way to fix? Thanks.

@minjamedia333 6 лет назад

Hi, can you make video how to correct focus on one side of focal length. I fine tune my 24-70 on 50mm and its not good on 24mm, if I fine tune on 24mm it is soft on 50mm and 70mm. Thanks

@mikeno62 6 лет назад

I would think you should maybe change one, or take out one of the very thin washers that sit under the bajonet, and in that way change the "micro adjustment". It's just an idea because many lenses are adjusted in that way in the factory. I have no (0) idea how much it will help, but it would be a simple fix to see if it could work. You need to take good care of the flex cables, and specialy the one from the bajonet to the circuit board.Take a closer Look at page D6 - D7 in the repair manual. Here you can get the repair manual: arcticwolfs.net/ Cheers Kenneth

@minjamedia333 6 лет назад

Thanks, I will try when photography season finish. Greetings

@rudolfloefs1275 4 года назад

Does anyone know why my Nikon 24-85mm f/3.5-4.5G keeps hunting after I repaired the zoom function because it has a loosen screw inside?

@mikeno62 4 года назад

It could be a dirty magnetic strip, or if you have touched the magnetic strip with a magnetic screw driver (it will damage the info on magnetic strip). It could also be a bad or broken wire, a bad soldering.