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Thread started 17 Jul 2013 (Wednesday) 12:07
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Sigma 18-35mm f/1.8 DC HSM

 
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Jul 13, 2017 19:30 |  #826

Mine is 013.


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Ah-keong
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Post edited over 2 years ago by Ah-keong.
     
Jul 14, 2017 02:24 |  #827

I am not a regular but mine is 013.


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Bobster
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Jul 15, 2017 21:01 |  #828

pwk wrote in post #18401370 (external link)
Out of curiosity, for the regulars in this thread, what year does the date code on your lenses read? It's the 3 digit number.

013, why does that matter?


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therobveiller
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Jul 17, 2017 13:31 as a reply to  @ Bobster's post |  #829

The 013 is not the date, it's the model ident. The 18-35 is model A013 and has just 013 on the barrel, 50mm 1.4 Art is model A014 and has just 014 on the barrel, and the 150-600 Contemporary is model C015 - it has just 015 on the barrel.




  
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Marm ­ O. ­ Set
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Post edited over 2 years ago by Marm O. Set.
     
Jul 19, 2017 11:27 |  #830

More than one website says that it refers to the year the lens was released.
"Sigma engraves the product introduction year into the lens barrel of Global Vision lenses." (external link)

the 18-35mm was released in 2013 so it has an 013
the 50 was released in 2014 so it has 014
the 150-600 c was announced in September of 2014... maybe it wasn't released until 2015 and got engraved with 015?

I would suspect that all the 14mm f/1.8s will say 017 on the barrel.

I am not affiliated with Sigma. This is my understanding of the original intent for the numbers on the barrel. I reserve the right to be wrong :)


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therobveiller
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Post edited over 2 years ago by therobveiller. (2 edits in all)
     
Jul 19, 2017 13:58 as a reply to  @ Marm O. Set's post |  #831

Hmm, curious. Both the sport and contemporary 150-600 were introduced in the same year AFAIK, yet the C is 015 and the sport is S014.

I can't speak for the 14mm, but I also reserve the right to be wrong too, LOL.

It seems too much of a co-incidence that the number engraved on the barrel exactly matches the Sigma model number when used in conjunction with the nice little silver letter logo denoting if it's a sport/art/comtemporary lens. These model numbers show in exif data, LR, & also in the Sigma optimisation app used with the dock - as well as being printed on the cardboard box it comes in.

The title of the article you linked suggests it's the year of introduction, not to be confused with the year of manufacture. If it were the year of manufacture, then that would be useful info, but as abbreviated years are usually two digits I'm a bit sceptical, and my 2 month old 18-35 has 013 and no way was that made in 2013! "Year of introduction" is a bit of a chocolate teapot in terms of useful information to put on a lens part, it's not a unique identifier so why would they do that? It is engraved into the same piece of "metal" that the serial number is engraved into, and so neatly ties two useful things together - lens model number and its serial number.

If my reading of reviews is correct, Sigma have released three new Art lenses this year. By the linked article's implication the 135mm Art would also have 017 on the barrel, ditto the new 24-70 Art - not useful as unique identifiers :-)




  
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jmooberry
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Post edited over 2 years ago by jmooberry.
     
Jul 20, 2017 07:53 |  #832

therobveiller wrote in post #18406034 (external link)
"Year of introduction" is a bit of a chocolate teapot

OK Brit, what is the meaning of this figure of speech? We're not familiar with that in the States :)

Edit: Never mind, uselessness I assume.


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therobveiller
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Jul 20, 2017 08:41 |  #833

jmooberry wrote in post #18406599 (external link)
OK Brit, what is the meaning of this figure of speech? We're not familiar with that in the States :)

Edit: Never mind, uselessness I assume.

Spot-on :lol:
But as you guys wear your "pants" on the outside whilst the rest of the world wears them underneath :p

And it looks like you're right and I'm wrong. Upon further investigation Sigma seem to have severe mental abberations when it comes to model identification as both the 85mm Art and the 50-100 Art are both model A016 and the 30mm is C016, all have 016 on the barrel - chocolate teapot time again. I'll go crawl back under my rock and look at all the new and very different types of model A017 they're going to produce this year and pointlessly engrave as 017 on the barrel.




  
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Marm ­ O. ­ Set
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Jul 20, 2017 08:50 as a reply to  @ therobveiller's post |  #834

I agree that the introduction year barrel engraving doesn't make as much sense as a date code. I have no idea why Sigma decided to go that approach. I agree with you, it should have been a date code instead.

personally, I'm anxiously waiting for the A018 70-200 ;)


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Bobster
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Jul 20, 2017 08:54 |  #835

therobveiller wrote in post #18406638 (external link)
Spot-on :lol:
But as you guys wear your "pants" on the outside whilst the rest of the world wears them underneath :p

And it looks like you're right and I'm wrong. Upon further investigation Sigma seem to have severe mental abberations when it comes to model identification as both the 85mm Art and the 50-100 Art are both model A016 and the 30mm is C016, all have 016 on the barrel - chocolate teapot time again. I'll go crawl back under my rock and look at all the new and very different types of model A017 they're going to produce this year and pointlessly engrave as 017 on the barrel.

yeah my 50-100 has 016


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therobveiller
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Jul 20, 2017 09:10 |  #836

Marm O. Set wrote in post #18406648 (external link)
I agree that the introduction year barrel engraving doesn't make as much sense as a date code. I have no idea why Sigma decided to go that approach. I agree with you, it should have been a date code instead.

personally, I'm anxiously waiting for the A018 70-200 ;)

Me too!




  
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pwk
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Jul 20, 2017 20:09 |  #837

Sorry to cause so much confusion, though it looks like a consensus was reached!

I just got my 18-35 and 7D body back from Sigma for calibration and it's unfortunately still erratically focusing about 50% of the time with phase detect. Photos at f/1.8 look amazing when the camera nails it or I use liveview, but I'm currently in the confused and uncertain phase of where to proceed next with this dilemma as the B&H return period has expired. The date code question pertained to whether my lens was produced in the first year of production because it's easy to attach frustration to little things like that for me :lol:

That being said, I'll keep this thread moving once I get home tonight with some of my better photos.




  
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therobveiller
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Post edited over 2 years ago by therobveiller. (3 edits in all)
     
Jul 21, 2017 02:45 as a reply to  @ pwk's post |  #838

I think the problem with phase detect focusing is that everybody thinks it will be accurate every time, and it just simply will never be. It matters little if it’s a Canon lens or a Sigma lens; the DOF of such a wide aperture lens is so damn small. Even when locked down on a tripod with a static target, the DOT-tune AFMA method shows up the focusing error margin very well. You “tune” the MA offset until the peak of the results curve is in the right place, you don’t get a sharply defined single value that works every time. You use the middle of a spread of values that the camera/lens will report back as your offset, and that works as the best value most of the time. True, some lenses are better than others I agree, but they all produce a spread of values that peak at the “correct” focus even with all other factors locked down and static. When it focuses using one of its values away from the peak of the results curve, it will be evident when pixel peeping on a wide-open aperture shot. Sigma will have set your lens/camera combo to values at the centre of this error curve, nothing more.

Have a read of this very good article on the subject of focus error by LensRentals

https://www.lensrental​s.com …int-single-shot-accuracy/ (external link)

Add in your own slight movement and possibly that of the subject when focusing hand-held to the above problem, and it’s enough to compound the error you see wide open, making you think there is a major lens focus issue if you pixel peep. You don’t notice it with slower lenses as the DOF is so much wider, but those spread of focus “errors” are still there.

I think one of the summary points from the article says it all:
“Phase-detection AF has more shot-to-shot variation than contrast detection. It’s not huge, but it’s real. This shouldn’t surprise anyone. Phase detection was developed for fast AF speed and to detect subject movement. It wasn’t developed to be more accurate.

And if anyone say it will be better on a Nikon or a Sony, then they are ignoring the unchangeable laws of physics and talking ****.




  
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therobveiller
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Jul 23, 2017 16:06 |  #839

I do love this lens, it makes my crop camera just as versatile for shallow DOF as my FF, and wow is it sharp even wide open. I just need to get out and use it more.

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IMAGE LINK: https://flic.kr/p/SVtr​R1  (external link) Forde Abbey 20170425-4522 (external link) by Rob Swain Photography (external link), on Flickr

IMAGE: https://farm3.staticflickr.com/2821/33422941944_b4b5fe31e4_b.jpg
IMAGE LINK: https://flic.kr/p/SVtj​cJ  (external link) Forde Abbey 20170425-4590 (external link) by Rob Swain Photography (external link), on Flickr

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IMAGE LINK: https://flic.kr/p/SVth​G9  (external link) Forde Abbey 20170425-4611 (external link) by Rob Swain Photography (external link), on Flickr



  
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Jul 24, 2017 19:57 |  #840

took a wander around the garden

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