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FORUMS Canon Cameras, Lenses & Accessories Canon EF and EF-S Lenses 
Thread started 17 Mar 2010 (Wednesday) 16:54
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Sigma 17-70 f2.8-4 OS back focus?

 
Steave
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Mar 17, 2010 16:54 |  #1

Man, I really don't want to send this back...

Is Adorama pretty quick with returns?

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richierich1212
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Mar 17, 2010 16:57 |  #2

Any more sample pics? Different test subjects? It indeed does look it is backfocusing. I would send it in to get it calibrated.


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Steave
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Mar 17, 2010 16:58 |  #3

That's the only one I have ATM, I'll post some more up in a while

Focus point is the "plus" in the middle


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paradiddleluke
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Mar 17, 2010 17:09 |  #4

looks like back focus there >< not good this is the lens i want :[


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Steave
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Mar 17, 2010 17:10 |  #5

Here's some more, now it doesn't seem to be doing it

Focus is on the symbol in the middle

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tkbslc
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Mar 17, 2010 17:12 |  #6

What did you focus on this first sample, the TV? I don't think the AF system can lock on a black shiny flat surface too well.

Edit: you are using it on a 1Dmk2? Doesn't it vignette like crazy?


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Steave
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Mar 17, 2010 17:14 |  #7

paradiddleluke wrote in post #9817218 (external link)
looks like back focus there >< not good this is the lens i want :[

FWIW, I really do like this lens. It'd be great so long as it doesn't have focus issues. Focus is really fast and OS works great. I've got some vignetting, but you should be fine with the 1.6x crop

tkbslc wrote in post #9817230 (external link)
What did you focus on this first sample, the TV? I don't think the AF system can lock on a black shiny flat surface too well.

Edit: you are using it on a 1Dmk2? Doesn't it vignette like crazy?

Focus point was the + in the middle of the arrows on the remote. There is some decent vignetting with the hood on, but everything past 19mm or so is fine with it off.


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tkbslc
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Mar 17, 2010 17:18 |  #8

You were at 1/6 on the first, 1/80 on the second one. 1/6 is a little extreme even with IS.


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Steave
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Mar 17, 2010 17:21 |  #9

tkbslc wrote in post #9817267 (external link)
You were at 1/6 on the first, 1/80 on the second one. 1/6 is a little extreme even with IS.

I used a remote release and tripod along with 2 second timer


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paradiddleluke
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Mar 17, 2010 17:21 |  #10

those other shots you showed look like the focus is pretty spot on, weird about the remote, try again maybe? tripod etc.

And thanks about the information on the lens, yah having trouble justifying the $720 price tag of the EF-S 15-85 so i think this is a better option, I can buy a flash too now!


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Steave
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Mar 17, 2010 17:42 |  #11

paradiddleluke wrote in post #9817286 (external link)
those other shots you showed look like the focus is pretty spot on, weird about the remote, try again maybe? tripod etc.

And thanks about the information on the lens, yah having trouble justifying the $720 price tag of the EF-S 15-85 so i think this is a better option, I can buy a flash too now!

I *may* have found my issue. For the remote test I focused and recomposed slightly, would that affect the focus that much? I just did a real world test on my wife and noticed that when I focused and recomposed it back focused and when I set the AF point right it was almost spot on.

If you're looking for a flash, I'd recommend the sigma 530DG Supers, I love mine!


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lengz
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Mar 17, 2010 17:50 |  #12

On your image with manual, you can see that it starts getting blurry starting from around 5 lines down from the middle symbol, while the top doesn't get blurry till around the world INSTRUCTIONS. To me, looks like it's back focusing.




  
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johnbachel
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Mar 17, 2010 18:07 |  #13

It's always good to wait a day or two and take a number of images before reaching any conclusions. I often find that when making a major purchase, like a lens, first judgments can be wrong. It would be worth shooting at a calibrated focus target - there are several around. Here's one example.

http://regex.info/blog​/photo-tech/focus-chart (external link)

John


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paradiddleluke
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Mar 17, 2010 18:37 |  #14

Steave wrote in post #9817409 (external link)
I *may* have found my issue. For the remote test I focused and recomposed slightly, would that affect the focus that much? I just did a real world test on my wife and noticed that when I focused and recomposed it back focused and when I set the AF point right it was almost spot on.

If you're looking for a flash, I'd recommend the sigma 530DG Supers, I love mine!

they look pretty nice! I guess its between this and the 430 EX II, not sure yet. And recomposition may cause some issues with the focusing, the tv looks to be what, 2 inches or so back from where you wanted to focus, if you turned the camera a bit or moved it a bit forward that could cause it hopefully! would be a quick and easy fix :p


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Steave
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Mar 17, 2010 20:27 |  #15

johnbachel wrote in post #9817567 (external link)
It's always good to wait a day or two and take a number of images before reaching any conclusions. I often find that when making a major purchase, like a lens, first judgments can be wrong. It would be worth shooting at a calibrated focus target - there are several around. Here's one example.

http://regex.info/blog​/photo-tech/focus-chart (external link)

John

I'll do that and post the results in the next couple days. If it turns out it is back focusing, I might look at the updated 24-70 2.8 IF EX HSM. It looks to be much higher quality than the old sigma 24-70.


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Sigma 17-70 f2.8-4 OS back focus?
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