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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

 
mwsilver
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Apr 18, 2013 11:38 |  #181

jrbdmb wrote in post #15841673 (external link)
Sorry, didn't mean to offend ... but I thought that the edge performance of the old Sigma 30 1.4 was the main complaint about the lens. (See review at photozone as an example.) That said, in the majority of pictures above the edge performance is irrelevant, and the results are excellent.

From the MTF charts published by Sigma and early test data from lenstip, edge performance of the new 30mm 1.4 Art is improved - not as good as the full frame 35mm 1.4, but improved. But if you are creating photos like the CK bottle or portraits above you may never be able to tell the difference.

I wasn't offended, no apology necessary. Your not wrong about the previous version. Its not as good as the new version based on early test results. To those not familiar with the EX version your comment might have made that lens sound much worse than it is. To be sure, it is soft on the edges, especially wide open. A bigger issue however is the inconsistent AF. I purchased a new focus screen for manual focusing specifically as a result of that issue. When this lens is in focus, the results are quite good.


Mark
Canon 7D2, 60D, T3i, T2i, Sigma 18-35 f/1.8, 30 f/1.4. Canon EF 70-200 L f/4 IS, EF 35 f/2 IS, EFs 10-18 STM, EFs 15-85, EFs 18-200, EF 50 f/1.8 STM, Tamron 18-270 PZD, B+W MRC CPL, Canon 320EX, Vanguard Alta Pro 254CT & SBH 250 head. RODE Stereo Videomic Pro, DXO PhotoLab Elite, ON1

  
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little ­ johny
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Apr 18, 2013 13:33 |  #182

bobbyz wrote in post #15841532 (external link)
OK so which f1.4 is not soft on the edges. Not sure what you guys shoot at f1.4 and need to look at edges.:)

Sometimes we shoot with the side focus points, and that cause a huge problem on my old Sigma 30mm 1.4.

Are all the pictures above taken with the centre focus point ? If so, the potential problem has not been shown or proven non existance.

Hope I am wrong though.




  
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RTPVid
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Apr 18, 2013 14:15 |  #183

little johny wrote in post #15842092 (external link)
Sometimes we shoot with the side focus points, and that cause a huge problem on my old Sigma 30mm 1.4. ....

Ideal would be Sigma has fixed any focus issues, but almost as good would be if we can fix it ourselves using the USB dock.

So, I'm not really all that interested in focusing problems with the new Sigma's as much as I am interested in the capability of the USB dock to deal with any problems.


Tom

  
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silvrg35
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Apr 18, 2013 14:42 |  #184

jrbdmb wrote in post #15841673 (external link)
From the MTF charts published by Sigma and early test data from lenstip, edge performance of the new 30mm 1.4 Art is improved - not as good as the full frame 35mm 1.4, but improved.

The same lens renders differently on every camera body. There is a huge difference in image resolution when comparing crop and FF bodies.




  
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bobbyz
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Apr 18, 2013 14:50 |  #185

little johny wrote in post #15842092 (external link)
Sometimes we shoot with the side focus points, and that cause a huge problem on my old Sigma 30mm 1.4.

Are all the pictures above taken with the centre focus point ? If so, the potential problem has not been shown or proven non existance.

Hope I am wrong though.

Side focus points are now way near edges. I mostly used my 30mm f1.4 on 1dmk2 where I had no issues using outer AF points.


Fuji XT-1, 18-55mm
Sony A7rIV, , Tamron 28-200mm, Sigma 40mm f1.4 Art FE, Sony 85mm f1.8 FE, Sigma 105mm f1.4 Art FE
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Yogi ­ Bear
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Apr 18, 2013 15:02 |  #186

bobbyz wrote in post #15842358 (external link)
Side focus points are now way near edges. I mostly used my 30mm f1.4 on 1dmk2 where I had no issues using outer AF points.

I don't get it. Wouldn't the outer AF points on the 1dmk2 be closer to the edge of the lens than on a 1.6 crop body? It seems to me that the problem would only be worse on the 1.3 crop 1dmk2.


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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little ­ johny
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Apr 18, 2013 15:29 |  #187

Yogi Bear wrote in post #15842418 (external link)
I don't get it. Wouldn't the outer AF points on the 1dmk2 be closer to the edge of the lens than on a 1.6 crop body? It seems to me that the problem would only be worse on the 1.3 crop 1dmk2.

No, it should be worse on a 1.6 crop, because of a wider angle blah blah blah




  
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aquaforester
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Apr 18, 2013 15:30 |  #188

It's funny I just realized that there's a Sigma Service about 10 miles from my house. I guess I'll pay them a visit for calibration.


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DreDaze
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Apr 18, 2013 15:41 |  #189

little johny wrote in post #15842495 (external link)
No, it should be worse on a 1.6 crop, because of a wider angle blah blah blah

i don't see why it'd be worse on a crop...the 1.3crop 1D is going to be using even more extreme edges...the edges on the 1.3X would be cropped out on a 1.6 X...so if edge sharpness is where it's bad, it'd show more on a 1D


either way I don't get why people obsess over edge sharpness on fast lenses, or telephotos...


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Yogi ­ Bear
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Apr 18, 2013 15:47 |  #190

little johny wrote in post #15842495 (external link)
No, it should be worse on a 1.6 crop, because of a wider angle blah blah blah

"Wider angle"??

DreDaze wrote in post #15842539 (external link)
i don't see why it'd be worse on a crop...the 1.3crop 1D is going to be using even more extreme edges...the edges on the 1.3X would be cropped out on a 1.6 X...so if edge sharpness is where it's bad, it'd show more on a 1D.

My point exactly, thank you!


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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mwsilver
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Apr 18, 2013 21:43 |  #191

aquaforester wrote in post #15842500 (external link)
It's funny I just realized that there's a Sigma Service about 10 miles from my house. I guess I'll pay them a visit for calibration.

If you are taking about Ronkonkama, LI, that not just a service center, it's the US headquarters. I went there last month to have my copy calibrated.


Mark
Canon 7D2, 60D, T3i, T2i, Sigma 18-35 f/1.8, 30 f/1.4. Canon EF 70-200 L f/4 IS, EF 35 f/2 IS, EFs 10-18 STM, EFs 15-85, EFs 18-200, EF 50 f/1.8 STM, Tamron 18-270 PZD, B+W MRC CPL, Canon 320EX, Vanguard Alta Pro 254CT & SBH 250 head. RODE Stereo Videomic Pro, DXO PhotoLab Elite, ON1

  
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little ­ johny
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Apr 18, 2013 22:04 |  #192

That's my newbie's way of seeing things.

If a lens has to clamp everything on a smaller sensor, lights from the outer edge of the lens will shine on the sensor at an acute / wider angle. Therefore, it will be relatively off focus more than the centre. And, I think because of that, it is harder to produce a lens that's sharp right across the frame.

T3i is the only dslr cam I own since I started a year and half ago. I ran through five copies of Sigma 30mm 1.4 V1 and I could not get a copy that's sharp at all focal points.

I also have a Sigma 70-200 OS and I do not have side focal point problems.




  
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bobbyz
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Apr 18, 2013 22:04 |  #193

DreDaze wrote in post #15842539 (external link)
i don't see why it'd be worse on a crop...the 1.3crop 1D is going to be using even more extreme edges...the edges on the 1.3X would be cropped out on a 1.6 X...so if edge sharpness is where it's bad, it'd show more on a 1D

either way I don't get why people obsess over edge sharpness on fast lenses, or telephotos...

And that too when shooting wide open....


Fuji XT-1, 18-55mm
Sony A7rIV, , Tamron 28-200mm, Sigma 40mm f1.4 Art FE, Sony 85mm f1.8 FE, Sigma 105mm f1.4 Art FE
Fuji GFX50s, 23mm f4, 32-64mm, 45mm f2.8, 110mm f2, 120mm f4 macro
Canon 24mm TSE-II, 85mm f1.2 L II, 90mm TSE-II Macro, 300mm f2.8 IS I

  
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aquaforester
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Apr 19, 2013 06:49 |  #194

mwsilver wrote in post #15843636 (external link)
If you are taking about Ronkonkama, LI, that not just a service center, it's the US headquarters. I went there last month to have my copy calibrated.

Thanks, yep that's the one. Where you able to wait for the calibration to be done or did you have to leave it. Did you have to tell them anything specific or do they just calibrate. I'm giving them the camera as well.


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mwsilver
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Apr 19, 2013 09:18 |  #195

aquaforester wrote in post #15844546 (external link)
Thanks, yep that's the one. Where you able to wait for the calibration to be done or did you have to leave it. Did you have to tell them anything specific or do they just calibrate. I'm giving them the camera as well.

They did it while I waited. Took a half hour. I gave them the camera as well. You go into the front entrance foyer. Its not set up for customer support. No desk or anything. You ring the bell at the double glass door. Nothing but cubicles inside. It'll feel like you're in the wrong place. Someone will come to the door. Tell them what you want and they'll send a tech out to talk to you and take your lens/body. The lobby, such as it is has a small table and a couple of chairs. I called first, but not sure you have to. Get there by around 3pm or earlier if you don't want to risk having to leave it. You may not need it but bring your proof of purchase.


Mark
Canon 7D2, 60D, T3i, T2i, Sigma 18-35 f/1.8, 30 f/1.4. Canon EF 70-200 L f/4 IS, EF 35 f/2 IS, EFs 10-18 STM, EFs 15-85, EFs 18-200, EF 50 f/1.8 STM, Tamron 18-270 PZD, B+W MRC CPL, Canon 320EX, Vanguard Alta Pro 254CT & SBH 250 head. RODE Stereo Videomic Pro, DXO PhotoLab Elite, ON1

  
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New Sigma 30mm f1.4 Art
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