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Author Topic: Sigma 50mm F1.4 EX DG HSM Grinding  (Read 2563 times)

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Offline mandrake

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Sigma 50mm F1.4 EX DG HSM Grinding
« on: July 05, 2011, 10:51:46 PM »
Hi,
I bought the sigma 50mm 1.4 in April after a lengthy period debating between this and the sony 1.4 50mm. It is a great lens and I have had many good shots from it - once you get used to the sheer amount of light it lets in! Anyway, this weekend it started to make a short burst of grinding sound just as the focus reaches infinity. It was slightly alarming so I emailed sigma who came straight back to me saying to send the lens in and they'd look at it. I've boxed the thing up and am sending it off tomorrow - has anyone else had this experience, or know what causes it?

I'll keep you posted on the quality of service/repair when it comes back.

Mandrake
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Offline Bigbreakfast

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Re: Sigma 50mm F1.4 EX DG HSM Grinding
« Reply #1 on: July 05, 2011, 11:54:19 PM »
Oh dear it may be a stripped gear problem which Sigma lenses are prone to
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Two things are infinite: the universe and human stupidity; and I'm not sure about the universe. Albert Einstein
A700, sigma 70-200 2.8, sigma 105 macro, 70 -400 G, M42 lineup Helios F2 58mm, Carl Zeiss 50m F1.8, Pentax Super Takumar 135mm F3.5 - 'Be cruel, harsh, picky or just fussy - but when you critique my work please feel free to be honest!'

Offline peterf

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Re: Sigma 50mm F1.4 EX DG HSM Grinding
« Reply #2 on: July 06, 2011, 12:14:09 AM »
Unfortunately what BB says is true. I have 3 sigma lenses that I use on my A700. Recently my 24-70 F2.8's gears stripped.
This was after a few years of regular use. Not sure whats going on.
Peter
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Offline chappo1

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Re: Sigma 50mm F1.4 EX DG HSM Grinding
« Reply #3 on: July 06, 2011, 04:54:58 AM »
I stripped the gears on my Sigma 50-500mm on the A700 before I saw the note from Stef to set to "slow focus".  The 17-70 though is so far OK....john
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Offline mandrake

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Re: Sigma 50mm F1.4 EX DG HSM Grinding
« Reply #4 on: July 10, 2011, 12:02:51 AM »
Oof that sounds bad - I assume that it is warranty covered and that it will be fixed or replaced as that would appear to be a relatively serious compatibility flaw if the lenses don't work with the cameras for which they are built!
R
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Offline Nod

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Re: Sigma 50mm F1.4 EX DG HSM Grinding
« Reply #5 on: July 10, 2011, 04:07:32 PM »
I stripped my Sigma 70-300 on my a100.  I focused it manually for awhile but then it got to hard to turn and I heard a ratteling sound  so I took it apart and found that the gear itself had slipped out of position and was floating around.  I found that it had eaten out about a 1/4" of the plastic ring gear on the lens body.  The gear and shaft are made of metal (and would have to be I suppose) but the ring gear is just a molded plastic and the teeth are very fine.  It's easy to see how it could strip the ring gear.
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Gear: Sony a100, Minolta Maxxum 70,   Minolta 50mm f1.7, Sigma 17-70 f 2.8/4.5 macro, Minolta 70-210 f4 beercan, Quantary 28-90 f3.5/5.6, Kenko MC7 2x TC , Kenko MC4 1.4 TC.

Offline harveyzone

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Re: Sigma 50mm F1.4 EX DG HSM Grinding
« Reply #6 on: July 10, 2011, 09:13:25 PM »
Quote from: Bigbreakfast on July 05, 2011, 11:54:19 PM
Oh dear it may be a stripped gear problem which Sigma lenses are prone to

Stripped gears on an HSM lens?
Is the Sigma 50mm f/1.4 an HSM drive lens on Sony mount, or is it still screw drive?
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Offline Bigbreakfast

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Re: Sigma 50mm F1.4 EX DG HSM Grinding
« Reply #7 on: July 11, 2011, 11:49:21 PM »
Tom - doh - glad someone is paying attention. If its a HSM lens the gears can't be stripped by the camera.
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Two things are infinite: the universe and human stupidity; and I'm not sure about the universe. Albert Einstein
A700, sigma 70-200 2.8, sigma 105 macro, 70 -400 G, M42 lineup Helios F2 58mm, Carl Zeiss 50m F1.8, Pentax Super Takumar 135mm F3.5 - 'Be cruel, harsh, picky or just fussy - but when you critique my work please feel free to be honest!'

Offline chappo1

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Re: Sigma 50mm F1.4 EX DG HSM Grinding
« Reply #8 on: July 12, 2011, 01:42:58 AM »
Yea :-[ :-[ :-[ :-[ :-[ :-[ :-[  must admit I did not read the original closely enough- I just had the red mist of the experience in the eyes.   john
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“Time is a great teacher, but unfortunately it kills all its pupils."

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Offline mandrake

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Re: Sigma 50mm F1.4 EX DG HSM Grinding
« Reply #9 on: August 07, 2011, 11:08:20 PM »
Hi
Well I sent the lens off to sigma. They repaired it and sent it back after 10 days fully working again under warranty. Apparently the motor needed replacing no explanation why.

I went back to my 50mm standby (minolta 1.7 50mm) and really noticed the difference and missed the sharpness of the sigma. Glad to have it back but I live in dread of a similar problem recurring after the warranty runs out.

Mandrake
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