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FORUMS Canon Cameras, Lenses & Accessories Canon EF and EF-S Lenses 
Thread started 23 Feb 2018 (Friday) 15:02
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Focus broken on 50/1,4

 
Jocce
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Feb 23, 2018 15:02 |  #1

So, I took out my 50/1,4 that I haven't used for a while (Yes this by it self is a sin!).

Tried to focus and it didn't focus. I can gear the motor, but the focus is not moving.
I also tried switching between manual / auto focus and moving the focus ring manually, still nothing. (Indicator stuck almost by the infinity mark).

Is this worth repairing?
Is there anything I can try myself?


Or is this just a good reason to invest in a The 50/1,2 or Sigma Art?


/Jocce



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nrowensby
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Feb 23, 2018 15:13 |  #2

Common problem... More than likely, some pressure was put on the front element and warped the internal focus frame (prob not the correct name).

Several DIY tutorials on repairing the ring on YouTube. Probably not worth the price to send it to Canon or a repair shop.

http://www.fotomozaic.​ro …p?s=1&categ=0&i​dstory=225 (external link)


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TeamSpeed
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Feb 23, 2018 15:39 |  #3

Fix it yourself, patience and watch videos, if it still doesn't work at least you tried! I have fixed a few myself.


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Chet
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Feb 23, 2018 15:46 |  #4

I fixed mine last month!

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Jocce
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Feb 23, 2018 17:14 |  #5

Taken it apart and adjusted. Cant really get it right at this point.

Will try again tomorrow, clock is 12 AM here ;)


/Jocce



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Jocce
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Feb 24, 2018 03:00 |  #6

The "last" part is ok, running smoothly.

It is when I put in the white plastic guideparts that it starts getting hard to turn the focus.

Any ideas?


/Jocce



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Feb 24, 2018 04:28 as a reply to  @ Jocce's post |  #7

That aluminum chassis that the guides run in are still not true or uniform. Those cams should slide easily through the tracks.


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Chet
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Feb 24, 2018 08:25 |  #8

The slots in the aluminum housing get distorted with bumps to the lens. You have to gently bend it all back so that gap is uniform throughout. When the plastic guides slide smoothly anywhere in the slot with little or no slop, you are done and can reassemble. I wound up putting mine on the flat surface of my drill press. I put a piece of flat stock on top of the aluminum barrel and used the chuck pressure against it to make the surface flat again. This made the slots uniform.


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cristphoto
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Feb 24, 2018 23:20 |  #9

Chet wrote in post #18570624 (external link)
I fixed mine last month!

Are those two screws inside the rear lens mount? That makes my eyes hurt just looking at the image.


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Feb 25, 2018 10:11 |  #10

cristphoto wrote in post #18571632 (external link)
Are those two screws inside the rear lens mount? That makes my eyes hurt just looking at the image.

Those 2 small screws hold the electrical contact block to the mount.


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Feb 27, 2018 08:50 |  #11

Is it fixed?


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jnbradley
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Mar 11, 2018 23:44 |  #12

Just an FYI. I loaned my 50/ 1.4 lens to my sister who soon after tripped and fell, hitting the lens on the ground. The focus ring was very stiff and had a "grindy" feeling.
She sent it to Canon and they fixed it for $125. Didn't seem too unreasonable.

Jim


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Jocce
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Mar 12, 2018 09:02 as a reply to  @ Chet's post |  #13

No, tried two times but seems to need more love.

Got a Sigma 50/1,4 instead...will sell the other one (located in Sweden) to anyone interested.


/Jocce



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Focus broken on 50/1,4
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