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FORUMS Canon Cameras, Lenses & Accessories Canon EOS Digital Cameras 
Thread started 30 Jan 2010 (Saturday) 19:40
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7D and Sigma 70-200 EX focus probs

 
ions
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Jan 30, 2010 19:40 |  #1

After playing around with the MA this is the best that I can get it, I am new at this though.

Subject was seated in the same spot for both and sat very still, she did a great job. These are jpgs straight from camera. Both were taken from a tripod at f2.8, 1/25, iso 3200 and MA is set to -20.

Here my focus point was on her eye:

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


Notice that her snoot (yes snoot) is sharper than her eye.

100%ish crop:

IMAGE NOT FOUND
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Here my focus point was on her left ear:

IMAGE NOT FOUND
IMAGE IS A REDIRECT OR MISSING!
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Her eyes are now sharp.

100%ish crop:

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


This is an older 70-200 that was bought in 2000, I think my only option at this point is Gentec (Sigma in Canada). Any thoughts?

Gear: Canon EOS 5D3 | Canon EOS 7D | Canon 24-70L ƒ2.8 | Canon 100L ƒ2.8 | Canon 70-200 ƒ2.8L IS II | Canon 420 EX | Tamrac Evolution 9 | Crumpler 8 MDH | Manfrotto 190QC with 804RC2 head.
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BC888
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Jan 30, 2010 20:08 |  #2

Thats definitely a focusing problem. contact sigma and see what they say.




  
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ions
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Jan 30, 2010 20:11 |  #3

I've spoken to them on the phone. Given the age of the lens I'm in for approximately $130 which consists of $95 flat rate plus parts and taxes. Things are kinda tight right now, I can do it but I'd rather not if I can avoid it.


Gear: Canon EOS 5D3 | Canon EOS 7D | Canon 24-70L ƒ2.8 | Canon 100L ƒ2.8 | Canon 70-200 ƒ2.8L IS II | Canon 420 EX | Tamrac Evolution 9 | Crumpler 8 MDH | Manfrotto 190QC with 804RC2 head.
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kay188
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Jan 30, 2010 21:59 |  #4

No warranty? Warranty is 10 years.

Bring it into service at Gentec in Markham, Ontario, total cost is at most $95.
I brought my 70-200 in, and every time it comes back it's always $95, same with other lenses.

Service at Gentec is top notch.
Ask for David Rees.
He's very understanding, and took care of me and my Sigma 24-70 F/2.8 Macro, even when I had no proof of purchase but a store price tag on the box, under warranty.

Top notch service at Gentec. Great CSR's.


Ricoh GRD4 | Canon 1Ds, 1D, 1D2, 1D2n| Canon XTi | Tokina 11-16 F/2.8 | Canon 16-35L I | Canon 24 F/2.8 | Canon 35 F/2 | Canon 50 F/1.8 I | Canon 135L | Sigma 24-70 EX DG Macro | Sigma 70-200 F/2.8 APO EX DG | Sigma 30 F/1.4 |Sigma 50 F/1.4 |Sigma & Kenko 1.4x TC| Canon 580EX II | Sigma EF-500 Super | 2x Vivitar 285HV | RF-602 Triggers |

  
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Jan 30, 2010 22:22 |  #5

Warranty is 10 years for EX lenses that are... 2004/2005 or newer(I can't remember which). So the Gentec rep said on the phone anyway, but since it didn't apply to me I didn't store the info as vital. It was a 5 year warranty for EX lenses that were purchased previous to whatever year it was he said, and 2000/2001, when mine were purchased, falls into that category. He suggested bringing them in to see what they could do, I am going to go in on Monday morning. My Sigma EX 105mm macro doesn't work at all so that needs fixing before this gets serviced.


Gear: Canon EOS 5D3 | Canon EOS 7D | Canon 24-70L ƒ2.8 | Canon 100L ƒ2.8 | Canon 70-200 ƒ2.8L IS II | Canon 420 EX | Tamrac Evolution 9 | Crumpler 8 MDH | Manfrotto 190QC with 804RC2 head.
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gotak
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Jan 30, 2010 23:06 |  #6

I think you can try af adjust bit more before you send it in. Unless you reached max adjustment an it's still a problem. Try MF in live view 10x zoomed as the baseline. Then defocus and watch where the af moved the lens the difference between that and the baseline will show you which way to adjust plus suggest to you roughly yht amount needed. After setting an adjustment try again. It's time consuming but you can get good results without spending a dim. Oh and use large high contrast flat target.


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7D x2,, 50 f1.8, 11-16 f2.8, 17-55 f2.8, 70-200 f2.8 IS II, 100 2.8L, 430EX, 580EX, Di866, pixel king wireless TTL trigger.

  
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ImRaptor
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Jan 30, 2010 23:08 |  #7

Maybe your focus is so far forward be cause you've set you're MA to -20, which shifts the focus forward.


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gabebalazs
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Jan 30, 2010 23:14 |  #8

yeah, what made you set the AF micro adjustment to -20? No wonder you have serious front focus issue.
Try to set it back to 0 and go from there.


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Jan 30, 2010 23:35 |  #9

Funny thing, at -15 I'm getting the same results. I'm going to play with this tomorrow with stationary objects and see what happens. Before I made any adjustment at all I was getting a front focus, that's what started me playing with the MA.

Same lens at f3.2 and no MA. The focus was on the eye but the nose is what is sharp:

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


Is it possible that the old board inside this lens doesn't recognize the MA signals? Keep in mind I don't know if the camera is telling the lens to compensate based on the MA or not, it's just my assumption that's how MA works. It seems to me no matter what MA setting I choose I'm getting the same result.

Gear: Canon EOS 5D3 | Canon EOS 7D | Canon 24-70L ƒ2.8 | Canon 100L ƒ2.8 | Canon 70-200 ƒ2.8L IS II | Canon 420 EX | Tamrac Evolution 9 | Crumpler 8 MDH | Manfrotto 190QC with 804RC2 head.
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Jan 30, 2010 23:38 |  #10

I set the MA to -20 because the settings I tried first were doing nothing, that's what I got with -20 and focusing on ears. Now it appears it could have been on any setting and the only ways to get the eyes sharp would be to focus on the ears. Further testing is showing the MA to be doing nothing.


Gear: Canon EOS 5D3 | Canon EOS 7D | Canon 24-70L ƒ2.8 | Canon 100L ƒ2.8 | Canon 70-200 ƒ2.8L IS II | Canon 420 EX | Tamrac Evolution 9 | Crumpler 8 MDH | Manfrotto 190QC with 804RC2 head.
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ImRaptor
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Jan 30, 2010 23:42 |  #11

Go extreme, set it to +20 and post up the result. And you should be trying a static target at the same distance to help see what is really going on.


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ions
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Jan 31, 2010 00:02 |  #12

The dog is really getting annoyed at my shenanigans at 1AM and losing interest in being a good subject. It does appear I'm making ground in the +17 range though. Going to try tomorrow with something stationary.


Gear: Canon EOS 5D3 | Canon EOS 7D | Canon 24-70L ƒ2.8 | Canon 100L ƒ2.8 | Canon 70-200 ƒ2.8L IS II | Canon 420 EX | Tamrac Evolution 9 | Crumpler 8 MDH | Manfrotto 190QC with 804RC2 head.
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ImRaptor
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Jan 31, 2010 00:08 |  #13

ions wrote in post #9508540 (external link)
The dog is really getting annoyed at my shenanigans at 1AM and losing interest in being a good subject.

Hah, My dogs will sit without moving a muscle for half a day, but they some how know when I try to take a picture of them as they don't stay still at all then.


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Red ­ Dog
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Jan 31, 2010 05:13 |  #14

Have you tried AI Servo focus on your dog moving? Try it and check the results. My 7D was fine for static objects with my Sigma 120-300 and 70-200, but totally oof for moving objects on both.
Spoke to Sigma and they advised that if both lenses worked fine with the 40D, which they did, then there shouldn't be an issue with the 7D. The 7D is back to Canon for repair or replacement.


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Jan 31, 2010 05:41 |  #15

I bought the same lens to use on my 1D MkIII. It front focused so badly that the full camera adjustment was not enough. I took it to the Sigma "hospital" where they rectified it. It is now spot on. Strange scenario because I purchased the lense after using a borrowed one which was A1 out of the box !




  
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7D and Sigma 70-200 EX focus probs
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