October 22, 2017, 07:00:55 PM

Author Topic: Review: Sigma 24-70mm f/2.8 DG OS Art by TDP  (Read 3504 times)

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Review: Sigma 24-70mm f/2.8 DG OS Art by TDP
« on: October 09, 2017, 12:35:43 PM »
The-Digital-Picture has completed their extensive review of the Sigma 24-70mm f/2.8 DG OS Art series lens.

From TDP:

The promise of Sigma Art lens quality coming to the 24-70mm focal length range along with an f/2.8 max aperture and optical stabilization had a large number of photographers signing up to add this lens to their kits immediately on announcement day. Does the Sigma 24-70mm f/2.8 OS Art Lens fulfill Sigma’s “It’s Here to Steal the Spotlight” promise? From the perspectives of many, it was hoped that this lens would get that spotlight for its exceedingly sharp image quality performance and from that perspective, I’m sure that there is some let-down among the hopeful. However, this lens is optically competitive and it performs quite well for the price. Read the full review

This is definitely a lens that should be on your shortlist if you’re looking for an affordable 24-70mm f/2.8 stabilized lens.

« Last Edit: October 09, 2017, 12:43:41 PM by Canon Rumors »
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Review: Sigma 24-70mm f/2.8 DG OS Art by TDP
« on: October 09, 2017, 12:35:43 PM »

Jopa

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Re: Review: Sigma 24-70mm f/2.8 DG OS Art by TDP
« Reply #1 on: October 09, 2017, 05:20:46 PM »
I'm glad Bryan's saying the AF is fast and accurate, but @ 24mm the corners look quite bad compared to the Canon 24-70 II, and even the center is not as good... I think they should have called it just "24-70" or maybe "24-70 Contemporary", but not Art.

https://www.the-digital-picture.com/Reviews/ISO-12233-Sample-Crops.aspx?Lens=1119&Camera=979&Sample=0&FLI=0&API

jolyonralph

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Re: Review: Sigma 24-70mm f/2.8 DG OS Art by TDP
« Reply #2 on: October 09, 2017, 05:53:32 PM »
Looks poor at f/2.8 - which means that you might as well just get the Canon 24-70 f/4L IS instead.
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Re: Review: Sigma 24-70mm f/2.8 DG OS Art by TDP
« Reply #3 on: October 09, 2017, 06:39:55 PM »
Looks poor at f/2.8 - which means that you might as well just get the Canon 24-70 f/4L IS instead.

Especially when you consider that the Sigma's 0.7x macro mode is underwhelming... in that it does not exist.

That f/4L IS:  Sealed + IS + first party AF (ring USM to boot) + 0.7x macro = a heck of a value.

- A

ahsanford

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Re: Review: Sigma 24-70mm f/2.8 DG OS Art by TDP
« Reply #4 on: October 09, 2017, 06:43:53 PM »
I'm glad Bryan's saying the AF is fast and accurate, but @ 24mm the corners look quite bad compared to the Canon 24-70 II, and even the center is not as good... I think they should have called it just "24-70" or maybe "24-70 Contemporary", but not Art.

https://www.the-digital-picture.com/Reviews/ISO-12233-Sample-Crops.aspx?Lens=1119&Camera=979&Sample=0&FLI=0&API

That's interesting, as LensTip found the 70mm end to be more problematic than the 24mm end:

https://www.lenstip.com/507.4-Lens_review-Sigma_A_24-70_mm_f_2.8_DG_OS_HSM_Image_resolution.html

Also, under their new more stringent AF protocol, this is what they found:

"The accuracy performance we assess positively, both in the studio and outdoor. For the most difficult combination of the 70 mm focal length and f/2.8 aperture, with the lens positioned before a testing chart, you might count on 88% of hits accurate within just 5% of difference from the best result. A bit worse hits but still completely acceptable (from 5 to 10% of difference from the best result) constituted 7% of all shots.There were 5% of shots considered by us to be totally missfocused (different by more than 20% from the sharpest photo). The results at the shorter end of the focal spectrum were even better due to the increase of the depth of field."

You can read that two ways -- the new LT hit rate test is indeed a high bar, or this Sigma lens whiffs 5% of the time.  Again, without a *proper* AF hitrate database, these one-off tests on one lens are only so useful.  But caveat emptor, test your new gear before you can't return it, etc.

- A

Ryananthony

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Re: Review: Sigma 24-70mm f/2.8 DG OS Art by TDP
« Reply #5 on: October 09, 2017, 07:02:21 PM »
Looks poor at f/2.8 - which means that you might as well just get the Canon 24-70 f/4L IS instead.

Especially when you consider that the Sigma's 0.7x macro mode is underwhelming... in that it does not exist.

That f/4L IS:  Sealed + IS + first party AF (ring USM to boot) + 0.7x macro = a heck of a value.

- A

Couldn't agree more. You're also forgetting the almost full pound in weight savings over the Sigma. If one can live with out the f2.8 aperture, the 24-70f4IS looks to be a great purchase.

ahsanford

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Re: Review: Sigma 24-70mm f/2.8 DG OS Art by TDP
« Reply #6 on: October 09, 2017, 07:10:47 PM »
Looks poor at f/2.8 - which means that you might as well just get the Canon 24-70 f/4L IS instead.

Especially when you consider that the Sigma's 0.7x macro mode is underwhelming... in that it does not exist.

That f/4L IS:  Sealed + IS + first party AF (ring USM to boot) + 0.7x macro = a heck of a value.

- A

Couldn't agree more. You're also forgetting the almost full pound in weight savings over the Sigma. If one can live with out the f2.8 aperture, the 24-70f4IS looks to be a great purchase.

We are drifting perilously into f/4L IS fanboyhood.   :)

Let's get back to the Sigma, apologies. 

Presuming this doesn't stack up to the f/2.8L II, how does it fare against it's true rival -- Tamron -- to be '#1 in the #2 business'?

- A

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Re: Review: Sigma 24-70mm f/2.8 DG OS Art by TDP
« Reply #6 on: October 09, 2017, 07:10:47 PM »

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Re: Review: Sigma 24-70mm f/2.8 DG OS Art by TDP
« Reply #7 on: October 09, 2017, 09:43:18 PM »
And the 24-70L ii remains , YES EVEN WITHOUT STABILIZATION, one of the finest lenses I have ever owned.

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Re: Review: Sigma 24-70mm f/2.8 DG OS Art by TDP
« Reply #8 on: October 10, 2017, 06:50:21 AM »
Looks poor at f/2.8 - which means that you might as well just get the Canon 24-70 f/4L IS instead.


Why is even the talk here?
Canon 24-70 f/2.8 no IS will set you back $1k more.
Why would anyone want to get f4 for 400 less just for the sake of IS? They are mutually excluding each other.
This one is hard to compare since it would provide f/2.8 (could use or not the stabilization).

Having IS and 2.8 for THAT price is perfect for evening events. And considering the better always improving algorithms for removing vignette and distortions... This talk here can be considered abomination. :D :D :D
Luck is what happens when preparation meets opportunity.

Jopa

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Re: Review: Sigma 24-70mm f/2.8 DG OS Art by TDP
« Reply #9 on: October 10, 2017, 05:42:17 PM »
I'm glad Bryan's saying the AF is fast and accurate, but @ 24mm the corners look quite bad compared to the Canon 24-70 II, and even the center is not as good... I think they should have called it just "24-70" or maybe "24-70 Contemporary", but not Art.

https://www.the-digital-picture.com/Reviews/ISO-12233-Sample-Crops.aspx?Lens=1119&Camera=979&Sample=0&FLI=0&API

That's interesting, as LensTip found the 70mm end to be more problematic than the 24mm end:

https://www.lenstip.com/507.4-Lens_review-Sigma_A_24-70_mm_f_2.8_DG_OS_HSM_Image_resolution.html

Also, under their new more stringent AF protocol, this is what they found:

"The accuracy performance we assess positively, both in the studio and outdoor. For the most difficult combination of the 70 mm focal length and f/2.8 aperture, with the lens positioned before a testing chart, you might count on 88% of hits accurate within just 5% of difference from the best result. A bit worse hits but still completely acceptable (from 5 to 10% of difference from the best result) constituted 7% of all shots.There were 5% of shots considered by us to be totally missfocused (different by more than 20% from the sharpest photo). The results at the shorter end of the focal spectrum were even better due to the increase of the depth of field."

You can read that two ways -- the new LT hit rate test is indeed a high bar, or this Sigma lens whiffs 5% of the time.  Again, without a *proper* AF hitrate database, these one-off tests on one lens are only so useful.  But caveat emptor, test your new gear before you can't return it, etc.

- A

Any idea what's a hit rate for the 24-70 2.8 II ? I just can't understand if this 88% is good or not? :)  Theoretically it should be a 100, but with PDAF there is always a chance to miss.

Jopa

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Re: Review: Sigma 24-70mm f/2.8 DG OS Art by TDP
« Reply #10 on: October 10, 2017, 05:50:38 PM »
^ found it.

24-70 II

"The accuracy of the mechanism deserves also a lot of praise. In studio conditions it missed in just 2% of shots which is a very good result."

That's nice they have real world AF accuracy test results. It's not possible to use their website search though, had to use google.

ahsanford

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Re: Review: Sigma 24-70mm f/2.8 DG OS Art by TDP
« Reply #11 on: October 10, 2017, 06:24:23 PM »
^ found it.

24-70 II

"The accuracy of the mechanism deserves also a lot of praise. In studio conditions it missed in just 2% of shots which is a very good result."

That's nice they have real world AF accuracy test results. It's not possible to use their website search though, had to use google.

Yes and no.  LensTip recently improved their focusing system from coarse hits / misses -- which was generally favorable towards a hit -- to a graded in focus / just out of focus / true miss.  I believe they did this deliberately with the Sigma... 85 Art (was it?) to specifically see if Sigma had upped their game.  They've been using it fairly consistently since that time.

So comparing results from both pre & post change may not be so telling.  That said, I'd have no doubt a flagship first party offering like the f/2.8L II was a faster/better/more consistent overall focuser.

- A

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Re: Review: Sigma 24-70mm f/2.8 DG OS Art by TDP
« Reply #12 on: October 10, 2017, 06:55:40 PM »
Unless you are aware that Sigma Image Stabilisation algorithm of Art and Contemporary series is not that great (understatement). Couple this with subpar AF performance in low light (EV 5.0 and below) to compliment the picture.



Having IS and 2.8 for THAT price is perfect for evening events. And considering the better always improving algorithms for removing vignette and distortions... This talk here can be considered abomination. :D :D :D

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Re: Review: Sigma 24-70mm f/2.8 DG OS Art by TDP
« Reply #12 on: October 10, 2017, 06:55:40 PM »

Diko

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Re: Review: Sigma 24-70mm f/2.8 DG OS Art by TDP
« Reply #13 on: October 11, 2017, 05:21:35 AM »
subpar AF
Sorry... what is subpar AF... really english is not my native  :-[ Not kiddin' you.

Thanks in advance.
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SecureGSM

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Re: Review: Sigma 24-70mm f/2.8 DG OS Art by TDP
« Reply #14 on: October 11, 2017, 07:11:46 AM »
subpar - A lower standard than customary or traditionally accepted norms, but not entirely unacceptable. For example, a computer's speed may be subpar, indicating that it is running slow relative to other computers, but this does not necessarily mean it is broken or unusable.

http://www.businessdictionary.com/definition/subpar.html

in other words, it is not the best in low light conditions ;)

subpar AF
Sorry... what is subpar AF... really english is not my native  :-[ Not kiddin' you.

Thanks in advance.

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Re: Review: Sigma 24-70mm f/2.8 DG OS Art by TDP
« Reply #14 on: October 11, 2017, 07:11:46 AM »