Magic Lantern Forum

General Discussion => General Chat => Topic started by: theBilalFakhouri on July 20, 2020, 01:07:17 AM

Title: Help me fixing Canon 50mm 1.8 II Lens
Post by: theBilalFakhouri on July 20, 2020, 01:07:17 AM
Hello All
A few days ago I dropped the lens accidentally, this not the first time, after every drop of the lens, the front piece of the lens comes out, I re attaches it and everything will work as before

After dropping the lens the front piece comes out like this:
(https://www.magiclantern.fm/forum/proxy.php?request=https%3A%2F%2Fi.ibb.co%2FdLyTRKN%2FTwo.jpg&hash=561d9e8029f13edcc39a5f676bb58444) (https://ibb.co/QCGg4mW)


But last time I dropped it I wasn't so lucky, I got this message from Canon:
(https://www.magiclantern.fm/forum/proxy.php?request=https%3A%2F%2Fi.ibb.co%2FGHVCFPN%2FCanon-M.jpg&hash=8064fcd2a3790ca199b25bf6f92f86b6) (https://ibb.co/sWFst3z)


-Of course all contacts are clean and I am sure nothing wrong with them

And this what happens inside the lens:

The Aperture motor is faulty, stucked?

or there is something not in the right place, like this: (Edit: No, it's in right place)
(https://www.magiclantern.fm/forum/proxy.php?request=https%3A%2F%2Fi.ibb.co%2F2t0cWJn%2FNot.png&hash=97b6dab1807dd4287edc0a7b97d0f3f4) (https://imgbb.com/)

I can open up/close down the aperture manually by hand . . and the focus ring is okay . .

I am gonna appreciate any help from you!
Title: Re: Help me fixing Canon 50mm 1.8 II Lens
Post by: yourboylloyd on July 20, 2020, 01:35:38 AM
Buy one on amazon then send it back "these guys sold me a broken lens!!!"  :D


Or you can take apart the new one and use those parts and return it with older parts :D

Nah don't do that. I'm just trolling (or am I?). You can possibly convert it to a manual focus only lens? Or you can just spend the $45 and get the yongnuo version of that lens which is the exact same thing.
Title: Re: Help me fixing Canon 50mm 1.8 II Lens
Post by: Skinny on July 20, 2020, 01:32:26 PM
Maybe you should check all solder joints (on chips, etc) and ribbon cables inside the lens? It could be a loose connection/cold solder
Title: Re: Help me fixing Canon 50mm 1.8 II Lens
Post by: ZEEK on July 20, 2020, 02:08:19 PM
I'd put it back together neatly in one piece, quick wipe or clean and sell it as is / for parts.

Same thing happened to my 50mm STM Nifty Fifty, sold it for parts $50. Guess somebody had hopes of fixing it.

I've completely fixed a broken 50mm 1.2L before, but this STM was a difficult piece of plastic.
Title: Re: Help me fixing Canon 50mm 1.8 II Lens
Post by: theBilalFakhouri on July 21, 2020, 09:55:58 AM
Buy one on amazon then send it back "these guys sold me a broken lens!!!"  :D


Or you can take apart the new one and use those parts and return it with older parts :D

I will get you your revenge :D :P

You can possibly convert it to a manual focus only lens?
Currently this is the only option, that's what I will do, but I can't change the aperture outside the lens, only from the inside, it's okay, I uses this Lens usually at 2.2 Aperture.


Maybe you should check all solder joints (on chips, etc) and ribbon cables inside the lens? It could be a loose connection/cold solder

Checked, everything looks as it should be, didn't find something unusual, I will re-check again in future, thanks!


I'd put it back together neatly in one piece, quick wipe or clean and sell it as is / for parts.

Same thing happened to my 50mm STM Nifty Fifty, sold it for parts $50. Guess somebody had hopes of fixing it.

I've completely fixed a broken 50mm 1.2L before, but this STM was a difficult piece of plastic.

Good idea, thanks for sharing!
Title: Re: Help me fixing Canon 50mm 1.8 II Lens
Post by: Skinny on July 21, 2020, 10:43:55 AM
Well, it could be difficult to spot a broken solder connection, sometimes only reflow everything suspicious can fix it... Depending on your skills, I would advise you to check signals with oscilloscope or logic analyzer to see if the camera is actually trying to speak with electronics, and so on.
Title: Re: Help me fixing Canon 50mm 1.8 II Lens
Post by: theBilalFakhouri on July 23, 2020, 01:18:18 AM
Well, it could be difficult to spot a broken solder connection, sometimes only reflow everything suspicious can fix it... Depending on your skills, I would advise you to check signals with oscilloscope or logic analyzer to see if the camera is actually trying to speak with electronics, and so on.

Currently I am unable to reach out to these devices "oscilloscope or logic analyzer", maybe in future, my skills are that not bad, but didn't experienced reflowing electrical components before, but I have background how to do it. Thank you very much for trying to help!

Maybe I will back to it in near future, I am happy then to receive some advices from you
Title: Re: Help me fixing Canon 50mm 1.8 II Lens
Post by: Skinny on July 23, 2020, 08:16:25 AM
sure, no problems :)