Teardown and attempt to repair Canon 70-200 2.8L
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- čas přidán 10. 04. 2021
- Attempting to fix my all time favorite lens Canon EF 70-200 2.0L non IS lens.
It was exhibiting ficus hunting which resulting in randomly back-focused or front-focused images.
This is amazing full frame lens that serve me for 12 years and I want to make sure it will continue.
#canon #lens #repair - Věda a technologie
Hi, my lens soft focus after teardown and cleaning, how to calibration this lens?
Hey ! just watch your video and you just help me fixing a problem I had with my lens, it was kind a loose after the ring, with your video I was able to find where the screw was loose and tight them up, you save me the trouble to send it to Canon and wait for month to come back, and of course the $$$ that could have me cost ;) :) Thank you ....
You are always welcome! happy to hear it was useful ;)
where in the assembly were the screws, I think I have the same problem
I have a similar problem with my lens - the broken aluminum housing, except I have 3 breaks in total. How has the super glue solution worked? What did you use to clean the residue - acetone? Thanks for the informative video!
It still works fine, but for all 3 I would use metal epoxy for aluminium.
Thank you very much for making the video. Just a question I have the same lens and the zoom ring has a little play when I turn it left or right. Is this normal? Thank you so much
Thank you for watching. I think this should not happen, need to check and tighten the screws inside the lens.
Hi, thanks for the video. I have a fungus located in front lens group. Do you happen to know how to separate it? It's just behind the first glass from front.
No, sorry I dont think i know how to get there.
@@InsideOutElectronics ok no worries. I will check with the repair group in facebook and see if anyone has got an experience with it. Just one step away from having a clear glass again.
@@InsideOutElectronics hey just to give an update. I managed to separate the front group. Apparently theres a ring that hold the glasses together. Just need to carefully twist it counter clockwise. I protected the lens with masking tape to avoid any scratches from tools :)
@@winterspear6372 thank you for reporting on your success!
Hi. I see you only used one key to open the lens. Please, can you tell me which key it is? I want to disassemble my lens 70-200 2.8 for cleaning.
Key? No-no I use only 2 fillips screwdrivers 000 and 00
Great video, thank you. I could fix a noticebable loose on my 70-200/2.8 L USM with your video. How ever, I would need your expertise.... Once reassembled, the AF doesn't work well. It is actuated, but in a quite random way and I don't get the focus. Is there any calibration to make? I saw a rotative component on the electronic board, should I make something? Or else? Thank you in advance.
No Calibration I know of. Make sure all assembled correctly, all ribbon cables are connected securely and all screws are tighten good enough, but not too strong :)
I have a problem in zooming the lens. I has stuck where do I find the repair parts any lead?
Hi! You will not find any repair parts as this guys is long discontinued :(
But before looking for parts do you know hat is the issue ?
Hello, I am a jeweler and own a laser welding machine that works on aluminum. It is designed to make small welds and I think would work great for those type of brakes
This is amazing ! Im pretty sure it will. So fat it is holding ( have not look inside ) I also have 123/2L with cracked barrel inside, that was is harder to fix epoxy might not be strong enough
Hi there. If I want to buy the 4 pieces bayonet screw, where can I find them? Can I contact canon directly?
Unfortunately you cannot contact Canon, they are not talking to commoners like us :(
Only on ebay I guess you can find such screws.
@@InsideOutElectronics there aren’t many on eBay. I saw one but the photo wasn’t clear enough for me to compare my screw to theirs.
Hi there. Will ef 70-200 F2.8 ii rear mount screw be compatible with my 70-200mm F2.8iii? I damage 2 screws and can't find the right screw to replace I only saw 70-200 ii screw sell on ebay.
Hey! Are you talking about 4 screws that fixing bayounet to the lens body?
@@InsideOutElectronics yes.
@@sottheaphoeurng9044 i think they are interchangable. I have many lenses sharing same screws. But i would check by pulling one of your screws and comparing them with ones tou want to buy.... how much are they asking for them?
@@InsideOutElectronics 4 screws for 16bucks
I think that noise you are hearing could be the IS unit. I just bought a new 100mm macro lens, and it has a lot of noise.
No, this guys does not have IS :) I think this is AF clutch
@@InsideOutElectronics I did not realize they made a Canon EF 70-200 2.8L without built in IS.
I have what looks like the identical canon lens and mine has IS built in. I have been using it for years. Mine has 2 setting on the lens for IS. Maybe mine is a later version? edit: Mine shows a II on it, so I bet it is a newer version. Interesting to know.
I have never taken a lens apart, so I don't know what it is for sure. You could be right about it being AF clutch.
Hello what tools did you use? What's the size of the tools?thanks my husband has same lense and it got wet from heavy rain
Just a scredriwer! Nothing else ;)
Well also use gloves to protect lens from fingerprints.
wouldn't the screws be JIS standard? given these are assembled in Japan. I mean sure a regular small phillips would work but you risk stripping the screws by not using the proper tool @@InsideOutElectronics
@@julianuk3266 thank you for watching! TBH i have not heard about JIS before you mentioned it, thank you. Now i know what i need to have for Christmas ;) - a nice set of JIS screwdrivers ;)
Yes i learnt about JIS when i was working on a Japanese motorcycle, and i stripped a brake reservoir screw, which looked just like a regular phillips. They normally show its JIS head by having a tiny small dot on the screw head. Basically anything Japanese will be JIS. And you really can't go wrong with having a quality set of JIS screwdrivers, as they seem to work better with regular philiips screws than phillips drivers. My goto screwdriver regardless of if the screw is always a JIS driver. Once you get a set, you'll thank me in the back of your mind every time you unscrew a screw til the end of time now lol its crazy how unknown this so very important and useful fact is. @@InsideOutElectronics
What about lens alignment?
Thank you for watching ! Can you elaborate ?
Don't fool yourself into beliving the lens will be the same again after dis- and reassembly. Without professional optical adjustments the optical quality will suffer badly. After this every Canon 75-300mm will give you better results.
Thank you for commenting, I think it is better to have operational lens then heavy paperweight.
Also I did not touch anything in optical groups. Front group and rear group are intact.I do not think there is any optical suffering by touching AF assembly. And after repair it definitely works better up to this day.
The only thing I would be very concerned that people doing this touching lenses with dirty fingers or dirty gloves or introducing extra dust and lint inside the assembly.
@@InsideOutElectronicsWell, this is less about fingerprints and dust than the whole rear group - it is a centering element. So if you proceed after 12:30 and losen the screws centering on an optical bench will be necessary.
@@The-four-o-five If there is no screw slots for an adjustment to be made and no shims for spacing being used, I do not see why an optical bench would be needed. But if the broken tab is not put on strait I could see that it might cause a problem.
He is correct, as the rear element was removed (the black one with three screws and washers at 12:33). That rear element has some movement and if you don’t center it correctly, you will get coma or softness. That rear element needs to be placed on a collimator to get it sharp. However, sometimes if you’re careful and lucky, you can get by, by marking the spots exactly and lining the rear element up and screwing it down.
Hey do you have an instagram ?
Not really, why do you think I need an instagram?
@@InsideOutElectronics@ Inside Out Electronics sorry, I am contacting you to inquire about a repair or show a video of my problem with my stuck zoom ring. Just wanted a little help is all.
@@RyGrindHard I see, you can find my contact information in About section of this chanel