Sigma focusing on quality control
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Fred Miranda
Registered: Dec 31, 2001
Total Posts: 17710
Country: United States

Striving for better quality control, Sigma will now implement their own A1 MTF system for testing all new lenses before they they reach the customer. The Sigma 35mm F1.4 DG HSM A1 is the first lens launched with this new system.

"We used to measure lens performance using conventional sensors. However, we’ve now developed our own A1 proprietary MTF (modulation transfer function) measuring system using 46-megapixel Foveon direct image sensors. Even previously undetectable high-frequency details are now within the scope of our quality control inspections. The lenses in our new lines will all be checked using this new system before they are shipped."
Read More

Sigma Global Vision posted more pictures and information on the new Sigma 35mm f/1.4 DG HSM A1 and USB Dock.

Pre-order the Sigma 35mm f/1.4 DG HSM A1:
Canon Mount | Nikon Mount



vsg28
Registered: May 07, 2012
Total Posts: 1227
Country: United States

One issue here is that the Foveon sensor is a 1.5x crop sensor, so it will not directly translate to full frame corner/border sharpness unless they find a way to counter this.



snapsy
Registered: Feb 24, 2008
Total Posts: 4567
Country: United States

Their MTF rig sounds useful for detecting production issues but I wonder what they'll do with lenses detected as having lower-than-expected MTF. Tweak them? Toss them? Sell them?



Gochugogi
Registered: Jun 25, 2003
Total Posts: 9632
Country: United States

snapsy wrote:
Their MTF rig sounds useful for detecting production issues but I wonder what they'll do with lenses detected as having lower-than-expected MTF. Tweak them? Toss them? Sell them?


Maybe discounted as blems or B-grade stock for cute-rate flea bay dealers?



nkronberg
Registered: Nov 17, 2008
Total Posts: 229
Country: United States

anyone else get the impression that the title of this thread suggests a little bit of a chicken-egg problem?



dolina
Registered: Nov 05, 2008
Total Posts: 3628
Country: United States

Will this translate to less affordable glass?



galenapass
Registered: Feb 09, 2006
Total Posts: 3653
Country: United States

nkronberg wrote:
anyone else get the impression that the title of this thread suggests a little bit of a chicken-egg problem?



dsr1
Registered: May 09, 2008
Total Posts: 432
Country: United States

dolina wrote:
Will this translate to less affordable glass?


Hopefully, it will increase the IQ of all their lenses in the future. With Canons outrageous pricing on their new and vII lenses a lot of us are going to be forced away from Canon lenses to third party glass, like it or not. I don't know about anyone else but I have to justify my expenditures for my hobby.

My sweet wife just might beat the Hell out of me if I spent $2400.00 for a Canon 24-70- 2.8 lens (without) IS instead of $1249.00 for an aalllll' most as sharp Tamron 24.70 f2.8 VC (and there's no telling how much the Canon with IS is going to be). I know that's not a Sigma example but it's an example where third party lens makers are stepping up to the plate and making it easier to justify nice new glass.



jonorees
Registered: Jun 27, 2012
Total Posts: 21
Country: New Zealand

Either way this is good news. Clearly they know that starting a upper market product line requires constant IQ between units no body wants to pay $900 for a lotto ticket, <$400 is more acceptable for a compromise on quality.

Certainly Tokina & Tamron have stepped it up in the last 18 months and good to see that Sigma is following.

Canon certainly have to be wary of their pricing, sure they are producing some top notch glass, but the pricing perception for the semi-pro & hard-core hobbyist isn't going in their favour...



dadgummit
Registered: Sep 13, 2008
Total Posts: 134
Country: United States

I can see this helping with decentering and the like but the majority of issues people have with Sigma is the dreaded prime syndrome and I do not think a MTF test will catch that.

What I am talking about is when it front focuses badly up close but as you shoot subjects farther away it changes to back focusing at about 10-15 feet and further out. No amount of microadjust will help this unless your subject is always the exact same distance every time.



Edward Castro
Registered: Jun 19, 2006
Total Posts: 1186
Country: United States

Well another thing not in favor for Canon is the strong yen vs. dollars ratio.



RCicala
Registered: Jan 09, 2005
Total Posts: 2918
Country: United States

I think this is a huge step forward, especially combined with their Optimization Pro software and USB Dock.

I'm not saying it's everything, or that it fixes all problems. But when was the last time a manufacturer said "we had quality control issues, we fixed them, and we will show you what we've done". In the last few months:

Tamron offers guaranteed 3 day repairs.
Sigma offers multiple distance / focal length microadjustements.
SIgma is actually doing optical tests on lenses as they leave the assembly line (only Zeiss and Leica do that now).

I'm really quite pleased to see there's some companies that still think providing information and customer service is a good business model.



retrofocus
Registered: Apr 19, 2007
Total Posts: 3794
Country: United States

RCicala wrote:
I think this is a huge step forward, especially combined with their Optimization Pro software and USB Dock.

I'm not saying it's everything, or that it fixes all problems. But when was the last time a manufacturer said "we had quality control issues, we fixed them, and we will show you what we've done". In the last few months:

Tamron offers guaranteed 3 day repairs.
Sigma offers multiple distance / focal length microadjustements.
SIgma is actually doing optical tests on lenses as they leave the assembly line (only Zeiss and Leica do that now).

I'm really quite pleased to see there's some companies that still think providing information and customer service is a good business model.


Yes - Sigma seems to make the right business moves currently compared to giant Canon.....



vsg28
Registered: May 07, 2012
Total Posts: 1227
Country: United States

Edward Castro wrote:
Well another thing not in favor for Canon is the strong yen vs. dollars ratio.


This is the same for Sigma also.



Peacekpr
Registered: Sep 12, 2009
Total Posts: 113
Country: Canada

I don't care how much Sigma tries to convince us that they finally care about QA I'll never buy another third rate lens like Tamron or Sigma again.
Nothing beats Canon L glass.



kaycephoto
Registered: Aug 13, 2011
Total Posts: 924
Country: Canada

RCicala wrote:
I think this is a huge step forward, especially combined with their Optimization Pro software and USB Dock.

I'm not saying it's everything, or that it fixes all problems. But when was the last time a manufacturer said "we had quality control issues, we fixed them, and we will show you what we've done". In the last few months:

Tamron offers guaranteed 3 day repairs.
Sigma offers multiple distance / focal length microadjustements.
SIgma is actually doing optical tests on lenses as they leave the assembly line (only Zeiss and Leica do that now).

I'm really quite pleased to see there's some companies that still think providing information and customer service is a good business model.


+1

had a heartbreaking experience with the Sigma 50 1.4 - coz it was ALMOST excellent.. but almost doesn't count for much to an event photographer & so the Sigma was pretty terrible for me, even though i knew it was capable of excellent results sometimes.. hopefully this is a step in the right direction!



Pixel Perfect
Registered: Aug 16, 2004
Total Posts: 19800
Country: Australia

I've been very happy with Sigma lenses; 4 lenses currently all focus very accurately wide open, especially the 150 macro but even the 24 f/1.8, 50/85 f/1.4 are pretty much spot on. 5D III spot AF is really nice for getting accurate results.



Netgarden
Registered: Jan 06, 2005
Total Posts: 2547
Country: United States

Now if only they could be consistently sharp, i wouldnt mind paying more for sigma. I really like their color ratios. Hoping they will succeed, although sounds more like a marketing ploy in order to raise their prices. More power to them though if they can get their long zooms to be usably sharp at 500 mm.



David Baldwin
Registered: Jun 28, 2007
Total Posts: 2829
Country: United Kingdom

Bearing in mind the price tag of recent Canon lens releases Sigma's action is timely good news. Personally I have never been more open to considering third party lenses.



Ziffl3
Registered: May 25, 2009
Total Posts: 3953
Country: United States

still on the fence about sigma. i have the 50 f1.4. it has been to the shop, once; changed focus motor.
It needs to go back back for the back-focus outside of 10-12 ft.

i would be interested in the docking-software check.



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