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FORUMS Canon Cameras, Lenses & Accessories Canon EF and EF-S Lenses
Thread started 23 Jan 2011 (Sunday) 05:01
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EF 50mm f1.4 USM was Broken Now is Fixed

 
akfreak
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Jan 23, 2011 05:01 |  #1

I bought a 50 f1.4 USM here for like $150. It would stop down but would not AF at all (see video here (external link))

Oh here is what I learned. the 50 1.4 is not a ring type USM, it is a Micro USM, Also the front of the lens moves In and out when you focus. A word of advice. Buy a HOOD also Park the lens in Infinity. IF you dont the front of the lens will protrude the barrel. This is a problem because of the design of the lens. Any force on the front of the lens can bend the gear assembly causing the USM to fail. It causes a pinch point at the gears and and the USM will soon fail. Here is the OLD bound up one with a USM I took out of the lens I bought here.

IMAGE: http://farm6.static.flickr.com/5128/5380563508_1d2a75253e_b.jpg


I am happy to say the Lens is not AFing like NEW. However I have more in parts and time than it would of cost to buy a NEW one. Now I have a 50 1.4 that works but no warranty. The guys at Canon really Suck in the part department. They will show you a bad xerox copy of an exploded view of the lens. Sometimes it is on 2 or 3 pages for one section of a lens. It is hard to see exactly from a email'd copy, of a xerox copy, of a manual, exactly what part one may need.

When you buy parts from Canon they have a No refund policy. Make sure you order exactly what you need (good luck with that). I can un happily say I own 2 extra parts that I didn't need to fix my lens. The parts sales guy on the phone told me what I needed based on my description trying to ID from horrid drawings. Also because the Repair Tech could not cypher the drawings either so he just spit out a Number to get me off the phone.

In the end I did get the right part when I got frustrated and ordered the whole damn assembly. I wish I could get my hands on the lens repair manuals/ microfiche. When you ask to talk to a tech to help ID a part, it is a bad Joke. You end up talking to some know it all jerk that has access to a huge Bin of every part known to man than can ID exactly what they need to fix an Item, but cant help ID anything from the drawings the parts guys use to sell parts to consumers. It is kind of Scamish if you ask me.

They dont want capable people working on their own gear. They want to to send it in so they can charge you a bundle for a few bucks in parts. It's easy to fix stuff if everything is in front of you. Try doing it like I did, the blind stubborn guy method.

Back to the lens. Of the 50's the 1.4 is really over priced. The aperture needs to be 9 blades at least the Bokeh looks like a stop sign and they are all prone to damage from pressure on the front of the lens. PARK your 50 1.4 at Infinity. If you dont you may be very sorry.

Some info I fond trying to help the Parts guys ID what the Heck I want. The Reapir techs wont look at emails of Images either. I tried to take pics of what I wanted, they refused.

IMAGE: http://farm6.static.flickr.com/5165/5380596198_000fe221e4_b.jpg

I am happy to say I have a fully functioning 50 1.4 but it could of gone a helluva lot smoother and for less Money, if I could talk to someone knowledgeable, and customer service oriented.

I just wanted to share with you my struggle to fix a USM 50. I am going to get the 50L despite the negative tings I have been reading how it performs on a 7D. My Rental 50l will be here the 2nd week in Feb. I cant wait.

http://www.speedtest.n​et/result/1460485335.p​ngexternal link

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MGiddings ­ Photography
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Jan 23, 2011 06:05 |  #2

Some good advice about storing and protecting that lens.


http://www.mgiddings.c​om (external link)

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AntonLargiader
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Jan 25, 2011 07:36 |  #3

Thanks for the warning! How much were each of the parts you bought, and which ones are they in your picture?

I don't think I would buy a broken lens for $150 when a refurb from Canon is just over $300.


T2i . 18-55 IS . 70-300 IS USM . 70-200 2.8L IS . 28mm 1.8 . 100 Macro . 430EX II . TT1/TT5 . Bogen/Manfrotto 3021 w/3265 ball-mount

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JonK
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Jan 25, 2011 08:07 |  #4

Did you rebuild your own 50 1.4? I have one and it works perfectly, however there is dust or something on an element down inside and I'd like to clean it.


7NE | 7D | 5DII | 16-35/2.8L II | 24/1.4L II | TS-E 24/3.5L II | 50/1.4 | 85/1.2L II | 100/2.8L IS | 70-200/2.8L IS II | 400/5.6L | PIXMA Pro 9500 Mark II
check my blog:
www.jonkensy.comexternal link

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akfreak
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Jan 30, 2011 17:53 |  #5

AntonLargiader wrote in post #11710250external link
Thanks for the warning! How much were each of the parts you bought, and which ones are they in your picture?

I don't think I would buy a broken lens for $150 when a refurb from Canon is just over $300.

I bought a smashed front element 50mm 1.4 usm for 45 bucks. I took the parts from it to fix mine. I was in luck the lens was parked at infinity when it took the nose dive and nothing got bent.
I was buy ing it as a test bed to learn how to take apart a 50 1.4 and for the mount. The USM assy was a bonus.


http://www.speedtest.n​et/result/1460485335.p​ngexternal link

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Erik_L
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Minnesota
Jan 30, 2011 18:03 |  #6

Even before I knew of the AF failing on the 50 f/1.4, i was alwyas in the habit of storing my lenses "retracted". I guess OCD pays off this time :)


Canon EOS 1D III
Manfrotto 190X Pro B w/324RC2 "Action Head" | Canon 580EX II
Sigma 20 f/1.8 | Canon 35 f/1.4 L | Sigma 50 f/1.4 | Sigma 85 f/1.4 | Canon 135 f/2 L
Flickexternal linkr

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Jericobot
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preppingforthetrumpets
Jan 30, 2011 18:38 |  #7

Great read, nice too see some in depth tech to this lens


α7ii + (batis 25 f2 / zeiss 55 f1,8 / macro 90 f2,8)
♥ ♦ ♣ ♠

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akfreak
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Jan 31, 2011 00:25 |  #8

IMO the 50 1.4 should really be updated. It needs more blades, a Ring USM, and the front of the lnes needs to stay stationary. I mean there should be some middle ground from $100 1.8 $350 1.4 USM $1,500 1.2 . I think there should be a 50 1.4 usm MK II the 1.8 has a MK II why not the 1.4 IMO the MI of the 1.8 went down in quality. I mean I am all for a nifty 50 but to go from the metal mount, focus window, and nice focus ring to what it is today is a bit of a down grade.

I for one am willing to pay a little extra as time goes on for Better quality. The 50 1.4 USM needs a make over. I think the $650 range they could make a 1.4 without stop sign Bokeh ( more aperture blades) and a front group that doesn't move past the barrel of the lens, and for god sake throw in a stupid hood. $26 for a hood is just greedy.

I like the lens but my Takumar 50 1.4's make it look like a Turd.


http://www.speedtest.n​et/result/1460485335.p​ngexternal link

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joeseph
"smells like turd"
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Joined Jan 2004
Auckland, New Zealand
Jan 31, 2011 01:06 |  #9

good to hear you've had a result. Not that it's of any use to you now, but here'sexternal link a copy of the parts catalog. It may help someone...


some fairly old canon camera stuff, canon lenses, Manfrotto "thingy", 1D MK II converted for IR, and now an M5
TF posting: here :-)

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dccxxvi
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Feb 03, 2012 10:55 |  #10

very nice




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rick_reno
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Feb 03, 2012 14:43 |  #11

great post! some good info here.




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akfreak
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Feb 05, 2012 04:45 as a reply to rick_reno's post |  #12

Thanks Fellas Anything to help my fellow Photg Bothers


http://www.speedtest.n​et/result/1460485335.p​ngexternal link

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ZoneV
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Joined Dec 2010
Germany
Feb 05, 2012 07:23 |  #13

The parts catalog of the EF 50/1.4 is online. That and others you will find linked on my DIY homepage


DIY-Homepage (external link) - Image Gallery (external link) - Gear List

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Dreamt
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Feb 05, 2012 12:54 |  #14

http://www.eosdslr.com​/pdf/Part/EF 50 1.4 USM.pdf


My Flickrexternal link

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watt100
Cream of the Crop
14,021 posts
Joined Jun 2008
Feb 06, 2012 09:03 |  #15

akfreak wrote in post #11696653 (external link)
QUOTED IMAGE


lots of gears and moving parts in that little motor !




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EF 50mm f1.4 USM was Broken Now is Fixed
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