Author Topic: Help me fixing Canon 50mm 1.8 II Lens  (Read 1069 times)

theBilalFakhouri

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Help me fixing Canon 50mm 1.8 II Lens
« 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:
Two" border="0


But last time I dropped it I wasn't so lucky, I got this message from Canon:
Canon-M" border="0


-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)
Not" border="0

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!
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yourboylloyd

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Re: Help me fixing Canon 50mm 1.8 II Lens
« Reply #1 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.
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Skinny

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Re: Help me fixing Canon 50mm 1.8 II Lens
« Reply #2 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

ZEEK

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Re: Help me fixing Canon 50mm 1.8 II Lens
« Reply #3 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.
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theBilalFakhouri

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Re: Help me fixing Canon 50mm 1.8 II Lens
« Reply #4 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!
700D 1.1.5 | no more ISOless LV err 8 / SDR104 @ 240 MHz - Constant! | Fixed Scrambled LiveView in Higher resolution | Real-Time correct framing in the Way

Skinny

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Re: Help me fixing Canon 50mm 1.8 II Lens
« Reply #5 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.

theBilalFakhouri

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Re: Help me fixing Canon 50mm 1.8 II Lens
« Reply #6 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
700D 1.1.5 | no more ISOless LV err 8 / SDR104 @ 240 MHz - Constant! | Fixed Scrambled LiveView in Higher resolution | Real-Time correct framing in the Way

Skinny

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Re: Help me fixing Canon 50mm 1.8 II Lens
« Reply #7 on: July 23, 2020, 08:16:25 AM »
sure, no problems :)