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FORUMS Canon Cameras, Lenses & Accessories Canon EF and EF-S Lenses
Thread started 01 Nov 2008 (Saturday) 21:06
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50mm 1.4 droped/broken focus.

 
Nick_b
Senior Member
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968 posts
Joined Oct 2006
Ottawa
Nov 01, 2008 21:06 |  #1

I bought a used 50mm 1.4 that had been dropped and the focus had stoped working. I bought it, took it apart, and fixed it!

Sorry for the poor quality images it was late when I took them.

Here was the problem.

IMAGE NOT FOUND IMAGE IS A REDIRECT OR MISSING!
HTTP response: 404 | MIME changed to 'image/gif' | Byte size: ZERO


And this is what it should look like.

IMAGE NOT FOUND IMAGE IS A REDIRECT OR MISSING!
HTTP response: 404 | MIME changed to 'image/gif' | Byte size: ZERO


There was too much space in the channel where that white block rotates in and it was causing the barrel to become jammed. I fixed it with a pair of pliers. I simply squeezed the metal back into shape.

It's a little nosier then it should be but it focuses quick and seems to be accurate.

Some sample shots testing the focus....

IMAGE NOT FOUND IMAGE IS A REDIRECT OR MISSING!
HTTP response: 404 | MIME changed to 'image/gif' | Byte size: ZERO


100% crop.
IMAGE NOT FOUND IMAGE IS A REDIRECT OR MISSING!
HTTP response: 404 | MIME changed to 'image/gif' | Byte size: ZERO



So if you drop your 50mm and the focus locks up you may not need to send it in!

Oh and I paid 50 bucks for it. :D

50D, 2 x 20D, Elan 7E, 18-55mm 3.5-5.6 IS, 30mm 1.4 , 85mm 1.8, 200mm 2.8 II, flash 430EX, 580 EX
Canon G10
Pentax P30, 50mm 2.0

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sonnyc
Cream of the Crop
5,141 posts
Joined Jun 2005
san jose
Nov 01, 2008 23:21 |  #2

That's pretty good fix. You did a great job. Very sharp afterward too. :)


Sonny
websiteexternal link|Gear List

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angryhampster
"Got a thick monopod?"
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3,860 posts
Joined May 2006
Iowa
Nov 01, 2008 23:42 |  #3

Nice job on the fix. What a steal. Are you going to keep it or sell it for a large profit? :lol:


Steve Lexa
Iowa City Wedding Photography (external link)

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hk300
Senior Member
253 posts
Joined Dec 2007
Nov 02, 2008 20:40 |  #4

nice job, where did you get it? Ebay broken lenses are now way too expensive due to scammers who want to to swindle their insurance companies




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Nick_b
THREAD ­ STARTER
Senior Member
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968 posts
Joined Oct 2006
Ottawa
Nov 03, 2008 06:23 |  #5

I'm not really sure what I'm going to do with it? I'm probably going to put it through it's paces and then sell it, but I might just keep it!

I bought it off of a local online classifieds site. I'm not a big fan of the Ebay, although this lens might end up there. I'm not really sure how much to charge for such a lens? Obviously I'd be up front about it's history.


50D, 2 x 20D, Elan 7E, 18-55mm 3.5-5.6 IS, 30mm 1.4 , 85mm 1.8, 200mm 2.8 II, flash 430EX, 580 EX
Canon G10
Pentax P30, 50mm 2.0

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shaftmaster
Goldmember
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1,429 posts
Joined Nov 2008
above 5000 feet
Dec 10, 2008 15:39 |  #6

My 50mm f/1.4 focus broke about a month ago. The micro-USM motor was apparently working, because it would focus from about 3m to infinity but would not focus closer than 3m (AF or MF). It seemed that something internal was stuck and was preventing focus closer than 3m. If I spun the MF ring quickly it would get stuck in different spots but I couldn't get it to unstick. I relented to having it repaired by a Canon authorized facility, but now I wish I would've tried fixing it myself. I spent $35 to have the repair shop take a look at it, another $35 for parts, and $140 for labor. I'm still waiting a month later as the replacement parts are still en-route from Japan.

Anyway, what steps did you take to get access to the "white block" and the channel that it slides in? I may need to repair it myself in the future and I won't pay the repair shop $200 again.

P.S. I bought a used but excellent EF 50mm f/1.8 Mk 1 as a backup for much less than the repair.


Paul

Gear -- Flickrexternal link

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andyman8662
Hatchling
5 posts
Joined Sep 2006
Jan 26, 2009 00:36 |  #7

took mine apart, the little white plastic thing was broken, guess ill have to get one of those


Canon 30D
17-85 mm is usm
50mm 1.4 usm
manfrotto tripod

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toxic
Goldmember
3,498 posts
Joined Nov 2008
California
Jan 26, 2009 02:16 |  #8

Nick_b wrote in post #6613649external link
I'm not really sure what I'm going to do with it? I'm probably going to put it through it's paces and then sell it, but I might just keep it!

I bought it off of a local online classifieds site. I'm not a big fan of the Ebay, although this lens might end up there. I'm not really sure how much to charge for such a lens? Obviously I'd be up front about it's history.

I'll buy it for $60 :rolleyes:




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Perry ­ Ge
Batteries? We don't need no...   . . . or cards.
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12,266 posts
Gallery: 83 photos
Joined Jul 2007
Hong Kong
Jan 26, 2009 02:29 |  #9

Nice job! And for 50 bucks, such a simple fix? Steal of the century there.


Perry | www.perryge.com (external link) | flickr (external link) | C&C always welcome | Market Feedback & Gear | Sharpening sticky | Perspective sticky

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Pit
Senior Member
289 posts
Joined Aug 2006
New York, NY
Jan 03, 2013 21:26 |  #10

Just did this to my 50mm that was getting stuck in the middle of the focus range.
Awesome fix! Followed this guys instructions on how to take it apart.
http://www.fotomozaic.​ro/artikel.php?idstory​=225&s=1external link


Canon EOS 6D, Canon 24-70mm 2.8 Mk I, Canon 70-200 2.8 IS MK II, Sigma 35mm 1.4, Canon 100mm 2.8 Macro, 600EX-RT, 430EX II, 430EX, Transceivers, Bags, Tripods, Cables, Trigger Trap.

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AWebster33
Junior Member
21 posts
Joined Dec 2012
Jan 03, 2013 22:47 as a reply to Pit's post |  #11

Great info to have, thanks! I must admit I've always been a little sheepish when it comes to trying to repair things myself, but I may have to think twice before sending the next one in.


Canon 400D w/ grip, 18-55 kit lens, 50mm f1.4, 75-300, 85mm f1.8

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50mm 1.4 droped/broken focus.
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