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FORUMS Canon Cameras, Lenses & Accessories Canon EF and EF-S Lenses 
Thread started 15 Mar 2016 (Tuesday) 14:15
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Sigma USB Dock - Experiences?

 
asr10user
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Mar 15, 2016 14:15 |  #1

So I thought my recently purchased used Sigma 35mm Art was great and had no issues...... until I took the thing out and realized how bad focusing was at far distances.

I am now looking at buying the USB dock to calibrate myself, but am worried about spending hours with no real resolution.

Does anyone have horror stories about spending hours and still having the same focusing problems?

And does anyone have positive experiences in which the dock totally solved their problems?


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PineBomb
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Mar 15, 2016 14:42 |  #2

Are there dock horror stories? It's not that bad to perform. Instead of doing an adjustment at a single distance like you would for in-camera MFA, you'll perform the exercise at 4 different distances. Follow Sigma's instructions or use another method like dot tune, which is what I used.


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gremlin75
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Mar 15, 2016 15:22 |  #3

asr10user wrote in post #17936284 (external link)
Does anyone have horror stories about spending hours and still having the same focusing problems?

And does anyone have positive experiences in which the dock totally solved their problems?

I spent about an hour (maybe a little more) working on my 18-35mm f1.8. But I had m 4 focal lengths, each with several focus distance to do. Once I was done it dialed in the focus perfectly.




  
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asr10user
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Mar 15, 2016 17:06 |  #4

I guess a horror story is someone who spent forever trying to calibrate their camera, only to realize their focus issue cannot be fixed.


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JeffreyG
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Mar 15, 2016 18:24 |  #5

Nope, it does indeed work. And for a shortish prime it isn't even very difficult to use.

It is a pain for a a lens like the 120-300 or the 150-600, mainly because you have to calibrate 16 points (4x4 matrix) and all of the long points (8 of them) are at distances that cannot be done indoors. "infinity" really needs a distant target to calibrate for a long telephoto.


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thijs
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Mar 16, 2016 06:20 |  #6

I have a 35mm ART and wasn't really pleased with the AF performance.

It wasn't bad, but I felt it should be better. I went ahead and bought the dock. After maybe an hour or two of fiddling with the settings and testing over and over I felt I didn't get the results I wanted so I put the dock away a bit disappointed.

Turns out my lens works like a charm ever since and never looked at the dock again. In fact I wouldn't hesitate buying another Sigma lens knowing the results that can be achieved with the dock.

A bit of a hit and miss / trail and error in my case I guess, but very good results and big improvements are certainly possible!


www.thijsvanluijk.nl (external link)

  
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asr10user
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Mar 16, 2016 10:06 as a reply to  @ thijs's post |  #7

So you actually did adjustments and it wasnt good at the time? Could it just have been the firmware update that helped?

Im having trouble finding a local place in Los Angeles that sells this, might have to order online.


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thijs
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Post edited over 3 years ago by thijs.
     
Mar 16, 2016 10:10 |  #8

Well I did change the settings (microadjustment I think it's called), but in the very basic test setup (5Dc, so no Live-View etc, used my kitchen table with a bottle of ketchup) that I used I couldn't see a significant improvement at that time. So it seems I did the right corrections after all, but it didn't immediately show.

I get a lot more keepers ever since, anyway.


www.thijsvanluijk.nl (external link)

  
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asr10user
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Mar 25, 2016 09:23 as a reply to  @ thijs's post |  #9

Well I just spent a few hours last night calibrating mine. Just like you I didnt think MA was actually doing anything, I ended up with 0,0,0,-3

Which is pretty surprising, I thought my lens was WAY off. In only about 50 shots ive taken so far, 9/10 actually seem to be hitting focus now, compared to maybe 5-6/10.

Maybe the firmware update was a big help. I'll need to do further testing but so far so good.

Sidenote, I printed a huge 13x19 test chart, also bought a small cheap chart from amazon. But the best thing for the close ranges to test has been a regular computer keyboard.


6D, 50mm Art
G7, 14-42mm, 25mm 1.7, 42.5mm 1.7

  
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ebiggs
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Mar 27, 2016 11:20 |  #10

Works perfectly for me. :-)


G1x, EOS 1Dx, EOS 1D Mk IV, ef 8-15mm f4L,
ef 16-35mm f2.8L II, ef 24-70mm f2.8L II, ef 70-200mm f/2.8L IS II,
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Sigma USB Dock - Experiences?
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