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FORUMS Canon Cameras, Lenses & Accessories Canon EF and EF-S Lenses 
Thread started 29 Jan 2013 (Tuesday) 10:44
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New Sigma 30mm f1.4 Art

 
jrbdmb
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Apr 29, 2013 21:42 |  #226

Yes, thanks for the pointer. Roger seems to confirm what the MTF charts and Lenstip stated, that the big improvements here are away from the center of the frame - and that this is a good update but not quite the "mini 35 1.4" we were hoping for.


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Yogi ­ Bear
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May 29, 2013 15:04 as a reply to  @ jrbdmb's post |  #227

Here is a Sigma video which shows how the new Sigma USB Dock will work with the new Sigma lenses made for it: http://vimeo.com/64665​246 (external link)

Looks like it may be very useful! Is anybody with this lens going to buy the dock?


Canon EOS 7D | EF-S 17-55mm f/2.8 IS USM | EF-S 55-250mm f/4.0-5.6 IS |
EF 100-400mm f/4.5-5.6L IS USM | 250D | EF-S 10-22 mm f/3.5-4.5 USM | 580 EX II |

  
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mnphotos
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May 29, 2013 17:37 |  #228

Yogi Bear wrote in post #15979985 (external link)
Here is a Sigma video which shows how the new Sigma USB Dock will work with the new Sigma lenses made for it: http://vimeo.com/64665​246 (external link)

Looks like it may be very useful! Is anybody with this lens going to buy the dock?

Now that's cool! I'll definitely be getting a USB dock at some point.


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Yogi ­ Bear
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May 29, 2013 17:57 |  #229

mnphotos wrote in post #15980499 (external link)
Now that's cool! I'll definitely be getting a USB dock at some point.

That's great. Please let us know how it works for you.

I see that in your sig that you list the 30mm f/1.4. Is that the previous model or the new "Art" model?


Canon EOS 7D | EF-S 17-55mm f/2.8 IS USM | EF-S 55-250mm f/4.0-5.6 IS |
EF 100-400mm f/4.5-5.6L IS USM | 250D | EF-S 10-22 mm f/3.5-4.5 USM | 580 EX II |

  
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FEChariot
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May 30, 2013 02:52 |  #230

mnphotos wrote in post #15980499 (external link)
Now that's cool! I'll definitely be getting a USB dock at some point.

Yes it is cool. I don't know if I would want to mess with the focus limiter stuff though because it would seem like a pain to not have control over that without having to redock the lens.


Canon 7D/350D, Σ17-50/2.8 OS, 18-55IS, 24-105/4 L IS, Σ30/1.4 EX, 50/1.8, C50/1.4, 55-250IS, 60/2.8, 70-200/4 L IS, 85/1.8, 100/2.8 IS L, 135/2 L 580EX II, 430EX II * 2, 270EX II.

  
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pulsar123
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May 30, 2013 07:51 |  #231

Yogi Bear wrote in post #15979985 (external link)
Here is a Sigma video which shows how the new Sigma USB Dock will work with the new Sigma lenses made for it: http://vimeo.com/64665​246 (external link)

Looks like it may be very useful! Is anybody with this lens going to buy the dock?

What video fails to describe is how to arrive at those three "MFA" numbers (nine for zooms) you are supposed to enter in the lens firmware - the calibration step. Especially if your camera doesn't allow MFA - meaning there will be a long and painful process of trying to guess those numbers, switching the lens between the camera (sitting on a tripod and aimed at the calibration target) and the dock after each attempt - probably hundreds of times until good values are found.

I suspect this will make Sigma's dock much less useful than many people hoped it'd be.


6D, Tamron 24-70 f2.8 VC, 135L, 70-200 f4L, 50mm f1.8 STM, Samyang 8mm fisheye, home studio

  
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FEChariot
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May 30, 2013 08:25 |  #232

pulsar123 wrote in post #15982071 (external link)
What video fails to describe is how to arrive at those three "MFA" numbers (nine for zooms) you are supposed to enter in the lens firmware - the calibration step. Especially if your camera doesn't allow MFA - meaning there will be a long and painful process of trying to guess those numbers, switching the lens between the camera (sitting on a tripod and aimed at the calibration target) and the dock after each attempt - probably hundreds of times until good values are found.

I suspect this will make Sigma's dock much less useful than many people hoped it'd be.

Wow I didn't think about the guys without MFA.


Canon 7D/350D, Σ17-50/2.8 OS, 18-55IS, 24-105/4 L IS, Σ30/1.4 EX, 50/1.8, C50/1.4, 55-250IS, 60/2.8, 70-200/4 L IS, 85/1.8, 100/2.8 IS L, 135/2 L 580EX II, 430EX II * 2, 270EX II.

  
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MakisM1
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May 30, 2013 09:02 |  #233

pulsar123 wrote in post #15982071 (external link)
What video fails to describe is how to arrive at those three "MFA" numbers (nine for zooms) you are supposed to enter in the lens firmware - the calibration step. Especially if your camera doesn't allow MFA - meaning there will be a long and painful process of trying to guess those numbers, switching the lens between the camera (sitting on a tripod and aimed at the calibration target) and the dock after each attempt - probably hundreds of times until good values are found.

I suspect this will make Sigma's dock much less useful than many people hoped it'd be.

FEChariot wrote in post #15982147 (external link)
Wow I didn't think about the guys without MFA.

It could be as simple as publishing a custom-made chart that reads the correction in the units the dock wants, for different distances and focal lengths.


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Yogi ­ Bear
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May 30, 2013 09:03 |  #234

pulsar123 wrote in post #15982071 (external link)
What video fails to describe is how to arrive at those three "MFA" numbers (nine for zooms) you are supposed to enter in the lens firmware - the calibration step. Especially if your camera doesn't allow MFA - meaning there will be a long and painful process of trying to guess those numbers, switching the lens between the camera (sitting on a tripod and aimed at the calibration target) and the dock after each attempt - probably hundreds of times until good values are found.

I suspect this will make Sigma's dock much less useful than many people hoped it'd be.

FEChariot wrote in post #15982147 (external link)
Wow I didn't think about the guys without MFA.

And even if you DO have MFA, will the MFA "steps" in the Sigma USB Dock exactly correspond to the "steps" in your Canon camera's adjustment? IOW, if the camera is set to a MFA of +5 for a given lens, will the +5 on the USB Dock be the same? I wonder?


Canon EOS 7D | EF-S 17-55mm f/2.8 IS USM | EF-S 55-250mm f/4.0-5.6 IS |
EF 100-400mm f/4.5-5.6L IS USM | 250D | EF-S 10-22 mm f/3.5-4.5 USM | 580 EX II |

  
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DreDaze
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May 30, 2013 09:33 |  #235

all it takes is being in the hands of one person with a lot of time on their hands...there will be some sort of focusing chart made up that corresponds to the adjustments, and available for people within 6 months...

just watch


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vertigo235
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May 30, 2013 10:44 |  #236

I would assume you would start by setting all the adjustments the same.

Do a test and adjust all to +4 for instance if your lens is front focusing. If that doesn't solve your issues, then you can drill down to the different focal lengths and distances.


Canon EOS 6D EOS 5D Mark III | Apple Iphone 6 | Canon EF 24-105mm f/4L IS USM EF 70-200mm f/2.8L IS II USM EF 85mm f/1.8 USM EF 17-40mm f/4L USM | Sigma 35mm f/1.4 DG HSM 50mm f/1.4 EX DG HSM 50mm F1.4 DG HSM ART | Samyang 85mm f/1.4 AS UMC | Canon Speedlite 430EX II Speedlite 90EX | Yongnuo YN-468II

  
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FEChariot
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May 30, 2013 12:41 |  #237

vertigo235 wrote in post #15982503 (external link)
I would assume you would start by setting all the adjustments the same.

Do a test and adjust all to +4 for instance if your lens is front focusing. If that doesn't solve your issues, then you can drill down to the different focal lengths and distances.

Canon EF lenses have just two adjustment pots for calibration: a voltage pot and a freq pot. If you read the lens rental blog site, there is an article titled "Cariation facts and fallacies" showing both pots. Think of the slope of a line and the equation y=mx+b. Voltage gives you the zero point b. Freq gives you the slope m.

Now to make the lens equal reality you should only have to test two points say MFD and a midrange. If both point are the same then your line slope is correct and yu can put all numbers the same. If not then you can deduce the other two points from the equation. Given given Sigmas near, close, mid, and far adjustment points, say if your close adjustment was +1 and your mid point was +5, then your close and far would be +3 and +7.

The problem here is that the focus scale on the lens is logarithmic...


Canon 7D/350D, Σ17-50/2.8 OS, 18-55IS, 24-105/4 L IS, Σ30/1.4 EX, 50/1.8, C50/1.4, 55-250IS, 60/2.8, 70-200/4 L IS, 85/1.8, 100/2.8 IS L, 135/2 L 580EX II, 430EX II * 2, 270EX II.

  
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mnphotos
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May 30, 2013 12:44 |  #238

Yogi Bear wrote in post #15980576 (external link)
That's great. Please let us know how it works for you.

I see that in your sig that you list the 30mm f/1.4. Is that the previous model or the new "Art" model?

It'll be some time before I get one. The 30mm I have is the old model. I do have the 17-70 that's the new Contemporary model that would work with the dock.

It may end up being a painful process to use but at least it's doable versus no chance in hell or send it back to Sigma.


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pulsar123
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May 30, 2013 12:46 |  #239

MakisM1 wrote in post #15982247 (external link)
It could be as simple as publishing a custom-made chart that reads the correction in the units the dock wants, for different distances and focal lengths.

DreDaze wrote in post #15982300 (external link)
all it takes is being in the hands of one person with a lot of time on their hands...there will be some sort of focusing chart made up that corresponds to the adjustments, and available for people within 6 months...

just watch

??? The reason why Canon, Nikon, Sigma etc. created the ability to fine-tune AF is because each lens and each camera body has errors in its manufacturing. The numbers you have to enter to the Sigma's dock will be unique for each lens and each body it is used on. So sorry, no easy fix here.


6D, Tamron 24-70 f2.8 VC, 135L, 70-200 f4L, 50mm f1.8 STM, Samyang 8mm fisheye, home studio

  
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pulsar123
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May 30, 2013 12:51 |  #240

Yogi Bear wrote in post #15982250 (external link)
And even if you DO have MFA, will the MFA "steps" in the Sigma USB Dock exactly correspond to the "steps" in your Canon camera's adjustment? IOW, if the camera is set to a MFA of +5 for a given lens, will the +5 on the USB Dock be the same? I wonder?

I wondered that as well. But given that the Sigma's dock has the same range for MFA as camera bodies (-20...20), and the fact that camera MFA is apparently measured in DoF steps (or rather 1/8 DoF - I saw a reference somewhere) - something which is well defined - I'd guess that Sigma dock MFA should have almost one-to-one correspondence to Canon's camera MFA.


6D, Tamron 24-70 f2.8 VC, 135L, 70-200 f4L, 50mm f1.8 STM, Samyang 8mm fisheye, home studio

  
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