Hint for reassembly: when mounting the lens section with AF/MF switch in it, the switch with metal fork can be popped out. Then after lens section is reinstalled (7 screws) the switch can be popped back in in AF position. Beware that of the 7 screws, some are different length! Best to start from the AF motor, go clockwise and store them in this order. Then on reassembly you'll know exactly which screw goes where.
Thank you for providing this. It was extremely helpful. My zoom was locked due to a loose screw on the encoder contact bracket. When reassembling, I noticed a few points that may be helpful. There is a tiny blue switch on the focus motor assembly. It needs to interface with the external AF/M switch. The external AF/M switch has an additional "finger" that lifts one of the gears. When lifted, the gear disconnects the drive train from the motor. You'll want to pay careful attention to the position of both elements or the external AF/M switch won't work. There is also a slender, slotted, sheet metal "finger" extending from the ring that goes over the motor and has 7 screws. There's a small brass looking pin that will need to be in the slot. One of the brown kapton flexible circuits tends to get bunched up under the 7 screw ring. Push this clear from beneath with a probe. I found the 7 screw ring was much easier to get on with the lens at 50mm. This dropped the inner element down below so that it did not interfere with the ID of the ring.
Many thanks for your video, this helped me reparing the zoom ring of my own lens (it was locked). I had to disassembly all the rings but not the optical part and found that the zoom value coder was partly unscrewed and was blocking the zoom ring). It took me 3 hours the first time and 1 hour the second time (I missed a step on AF remount first time). Now my lens works fine again.
On my lens the zoom position coder metal arm holding the brushes was a bit loose, which was causing slight wobble in zoom ring. Good that I fixed it before it got worse. I secured the screw with 2 drops of lacquer.
Thanks this video helped guide me to remove some pesky dust that was between some of the elements. Unfortunately there is some dust trapped between elements that do not appear serviceable, but at least I got rid of the large particles that were causing the most issue.
the zoom ring on mine stopped working, you have to pull the front barrel while also turning the zoom ring to get it to go in and out now. everything else works fine. Would you say its loose screws inside? taking this apart looks kinda brutal....
Hello Sean, It is a bit demanding to disassemble this lens, but with a little patience and a lot of order to identify each of the pieces and the screws I know you can achieve it.
Hi, I'm thinking of buying a used tamron 24 70mm lens at a very good price (half of what other used ones are worth). The problem is that it was cleaned of fungi and from that moment the automatic focus works but it does not focus. The lens is currently clean, the VC is working, and the manual focus and zoom are working properly. Should you take advantage of this opportunity? Is the af fix expensive? can fungi come out again?
Thank you for this. Way too complicated for this model. I was thinking of opening it up and adding a black paper with an oval aperture hole right after the lens aperture, to emulate the anamorphic look. I don't think I'll do that now... or ever...
![How to calibrate lens autofocus WITHOUT buying a tool! [Lens Calibration Tip]](http://i.ytimg.com/vi/aAiGyl5CKlQ/mqdefault.jpg)
Hint for reassembly: when mounting the lens section with AF/MF switch in it, the switch with metal fork can be popped out. Then after lens section is reinstalled (7 screws) the switch can be popped back in in AF position.
Beware that of the 7 screws, some are different length! Best to start from the AF motor, go clockwise and store them in this order. Then on reassembly you'll know exactly which screw goes where.
Hello Ondrej,
Thank you very much for your suggestion, it is a good idea.
От души мужик, без тебя бы не вывез этот объектив
Думаю, он не понял)
Thanks for this video! It has helped me to open my lens and substitute a problematic piece. The music is great!!
Hi Alberto,
It's great to know that the video helped you to repair your lens.
Thank you for your comments!
Thank you for providing this. It was extremely helpful. My zoom was locked due to a loose screw on the encoder contact bracket.
When reassembling, I noticed a few points that may be helpful.
There is a tiny blue switch on the focus motor assembly. It needs to interface with the external AF/M switch.
The external AF/M switch has an additional "finger" that lifts one of the gears.
When lifted, the gear disconnects the drive train from the motor.
You'll want to pay careful attention to the position of both elements or the external AF/M switch won't work.
There is also a slender, slotted, sheet metal "finger" extending from the ring that goes over the motor and has 7 screws.
There's a small brass looking pin that will need to be in the slot.
One of the brown kapton flexible circuits tends to get bunched up under the 7 screw ring.
Push this clear from beneath with a probe.
I found the 7 screw ring was much easier to get on with the lens at 50mm.
This dropped the inner element down below so that it did not interfere with the ID of the ring.
Many thanks for your video, this helped me reparing the zoom ring of my own lens (it was locked). I had to disassembly all the rings but not the optical part and found that the zoom value coder was partly unscrewed and was blocking the zoom ring). It took me 3 hours the first time and 1 hour the second time (I missed a step on AF remount first time). Now my lens works fine again.
Hi Gwénolé,
Glad to hear that the video helped you repair your lens.
Thank you for your comments!
On my lens the zoom position coder metal arm holding the brushes was a bit loose, which was causing slight wobble in zoom ring. Good that I fixed it before it got worse. I secured the screw with 2 drops of lacquer.
Thanks mate!
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Muchas gracias por el video , es un trabajo brutal y de mucha paciencia y me ayudara en el proyecto de mi lente que es exacto a este
Hola Miguel,
Gracias por tus comentarios, me alegra saber que te será de mucha utilidad este video.
hi,thank you for your video,
do you know how to take out the front element glass?im struggle with that
Thanks this video helped guide me to remove some pesky dust that was between some of the elements. Unfortunately there is some dust trapped between elements that do not appear serviceable, but at least I got rid of the large particles that were causing the most issue.
Hi SneakyLeek,
It's too glad for me know that you found this video useful.
Thanks for your video, I found out the cable is broken, do you know where I can get a new one?
Hi Marco,
On ebay or aliexpress I have seen that some people sell these parts.
the zoom ring on mine stopped working, you have to pull the front barrel while also turning the zoom ring to get it to go in and out now. everything else works fine.
Would you say its loose screws inside? taking this apart looks kinda brutal....
Hello Sean,
It is a bit demanding to disassemble this lens, but with a little patience and a lot of order to identify each of the pieces and the screws I know you can achieve it.
Eu estava pensando em abrir minha lente mas depois desse vídeo é melhor mandar para um profissional abriu 😂😂
What number plus screwdriver do you use? Thank you so much for this content, keep going :))
Thanks a lot. After successfully disassemble it, i cannot assemble it again😅😅
Can you give me the link to buy the lens release screw?
I actually need a video on how to reassembly now... I'm stuck on the 18:15 part reassembling
Hi, I'm thinking of buying a used tamron 24 70mm lens at a very good price (half of what other used ones are worth). The problem is that it was cleaned of fungi and from that moment the automatic focus works but it does not focus. The lens is currently clean, the VC is working, and the manual focus and zoom are working properly. Should you take advantage of this opportunity? Is the af fix expensive? can fungi come out again?
The center lens gets me nuts. I stop there. So scary doing this
Thank you for this. Way too complicated for this model. I was thinking of opening it up and adding a black paper with an oval aperture hole right after the lens aperture, to emulate the anamorphic look. I don't think I'll do that now... or ever...
Hi Eugenia,
Good luck with your experiment, and feel free to share the result with us.