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FORUMS Canon Cameras, Lenses & Accessories Canon EF and EF-S Lenses 
Thread started 22 Apr 2013 (Monday) 00:40
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sigma 50 1.4 and mis focusing...

 
kenwood33
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Apr 22, 2013 00:40 |  #1

I have been testing the sigma 50 1.4 on a 5d2 recently. I found that if the subject is over 8 feet away, the chances of mis focusing using non-center focusing point is very high (>60%). If I take the same shot using center focusing point then the chances of misfocusing drops to < 10%. This is totally unscientific and just based on my experience using it to shoot a few events. However this behaviour is quite consistent and I am wondering if I got a lemon? Just to note, focusing less than 8 feet away is almost always spot on using any focusing points.


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Ilovetheleafs
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Apr 22, 2013 02:08 |  #2

could just need calibrated, your 5d2 has micro adjust, if it doesnt work can always send it to sigma to get calibrated


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stang67
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Apr 22, 2013 05:06 |  #3

Mine is exactly the same and so was the one before this one (I had two at the same time to pick the best because I was disappointed with the first, hence I got a 2nd). This one is much better, but focus is still off (not miss focusing per se, as it gets very close, but I can see visible CA so I adjust the MFA and all is fine). I have mine adjusted to +9 on my 50D (haven't gotten around to doing it with my 1D III yet).


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kenwood33
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Apr 22, 2013 19:03 |  #4

Well the focusing misbehaves only when the subject is far and when i am using non-center focusing point. If I stick to center point and recompose the it is fine.


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gasrocks
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Apr 22, 2013 19:08 |  #5

The further away the subject is, the smaller the AF point becomes. Therefore, less accurate. I like my Sigma 50/14 but I only MF it.


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pixel_junkie
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Apr 22, 2013 20:06 |  #6

Ilovetheleafs wrote in post #15853747 (external link)
could just need calibrated, your 5d2 has micro adjust, if it doesnt work can always send it to sigma to get calibrated

Calibration only helps with sharpness, not focus accuracy or focus inconsistency. Don't waste your time or money, won't help.


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*Jayrou
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Apr 23, 2013 03:57 |  #7

pixel_junkie wrote in post #15856562 (external link)
Calibration only helps with sharpness, not focus accuracy or focus inconsistency. Don't waste your time or money, won't help.

Of course it helps with accuracy , that's the whole point of it , shifting the plane of focus back and forth.


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pixel_junkie
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Apr 23, 2013 07:44 |  #8

*Jayrou wrote in post #15857579 (external link)
Of course it helps with accuracy , that's the whole point of it , shifting the plane of focus back and forth.

I meant inconsistency ...


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*Jayrou
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Apr 23, 2013 08:13 |  #9

pixel_junkie wrote in post #15857867 (external link)
I meant inconsistency ...

I'll give you that one..:)


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scroller52
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Apr 23, 2013 10:52 |  #10

the outer focus points on the 5d2 are completely unreliable regardless of lens.


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cthetoy
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Apr 23, 2013 20:05 as a reply to  @ scroller52's post |  #11

I just sent mine in for calibration and hope that will solve it. If I MA for close distance then my mid and far distance shots are not sharp. If I MA for far shots then my close shots are not sharp




  
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snake0ape
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Apr 24, 2013 16:07 |  #12

My sig50 had focusing issues with artificial lights. After sigma serviced the lens, it focuses very well now.


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aegid
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Apr 24, 2013 20:42 |  #13

I got my 85 back from CRIS in Arizona and even though it took a bit of time to get it back it came back stellar. Previously I had problems with focusing at things over 10 feet away. Everything closer than that was tack sharp and if I used AF adjust it knocked that out of whack. Now it's tack sharp at all distances.


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cthetoy
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Apr 25, 2013 10:30 |  #14

aegid wrote in post #15864155 (external link)
I got my 85 back from CRIS in Arizona and even though it took a bit of time to get it back it came back stellar. Previously I had problems with focusing at things over 10 feet away. Everything closer than that was tack sharp and if I used AF adjust it knocked that out of whack. Now it's tack sharp at all distances.

How long did it take to get it back? I sent mine in last week




  
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cthetoy
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Apr 25, 2013 11:05 |  #15

I just called CRIS and they said they received the lens 4/19 and will be completed and shipped tomorrow 4/26.

Normally she said it takes 4 weeks but perhaps my lens was just for calibrations and no parts was needed.




  
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sigma 50 1.4 and mis focusing...
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