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next PZ lens test report: Sigma 85mm f/1.4 DG HSM ART


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#1 Klaus

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Posted 18 February 2017 - 01:37 PM

Awesome ...

 

http://www.photozone...0-sigma85f14art


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#2 Rover

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Posted 18 February 2017 - 03:34 PM

Effin' revelation at 50 MP.

It also demolishes every other (tested) Canon-mount 85mm lens in the 21 MP scope. Remember how the old Sigma had noticeably weaker corners? If I had had this lens, I would've only stopped it down to get more adequate DOF. :D

Thanks for the test, Klaus!

 

P. S. Just noted that the URL shows it to be a review #1000. Of course it doesn't seem that it's the actual one thousandth review, but still a nice coincidence. :)



#3 Klaus

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Posted 19 February 2017 - 12:55 AM

There are some gaps in the numbering so it's not really article/review #1000. But we are getting there. ;-)


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#4 you2

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Posted 19 February 2017 - 01:45 PM

Hum. About the only thing they could chagne is less vignetting at 1.4 and APO (though not sure it would still have the high resolution it has). So this begs the question while 85 are common and there are many good ones can you actually have a 5* 85f1.4? -

 

still I rather have this then (for example) the 300f4 pro (olympus) because they managed the high resolution without screwing up the bokeh :)



#5 Rover

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Posted 19 February 2017 - 04:27 PM

1.8 stops of vignetting at f/1.4 is pretty decent for a full-frame lens tested on a Canon camera.  ;)



#6 dave9t5

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Posted 20 February 2017 - 10:34 AM

 

 

Bokeh Fringing In a perfect world scenario, you won’t see any axial CAs thus color fringing on the Z-axis. However, just like most (all?) of the other fast 85mm lenses, the Sigma 85mm f/1.4 HSM DG Art reaches its limits here.

 

How about the fast 85mm APO lens in this category?  



#7 Klaus

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Posted 20 February 2017 - 10:52 AM

Which fast 85mm APO ? The Otus ?


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#8 JoJu

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Posted 20 February 2017 - 11:01 AM

Yep.

 

However, I've seen them already second hand...



#9 Klaus

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Posted 20 February 2017 - 12:58 PM

Won't happen here. I have no interest in testing lenses that nobody can afford.

There's even one available for rent here but 368AUD for no return on investment - I don't think so.


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#10 JoJu

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Posted 20 February 2017 - 01:05 PM

I only can agree. Most people who need this kind of manual lenses already know, they don't get it somewhere else. A bit more or less MTF for them is less interesting than what these lenses in general make possible in terms of contrast and CA.



#11 Rover

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Posted 20 February 2017 - 03:49 PM

It's a bit pointless to test, say, the big superteles - it's pretty obvious that they're perfect from the get go. The Otus types are probably the same story - but if someone offers to lend you one to test, it'd be nice to see the results (that might even be construed as "reference" in the focal length range).

 

I think that the Sigma 85mm Art could be considered a reference lens for 5DSR tests by the way. It succeeds in making most (all?) other lenses - even the brand spankin' new Canon 35mm f/1.4 II - look horrible. :)



#12 dave9t5

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Posted 21 February 2017 - 09:57 AM

Which fast 85mm APO ? The Otus ?

 

Yup.   If one is going to acquire an f/1.4 lens then presumably they are planning to use it wide open.  The pursuit of clinical resolution wide open is diminished if marred by distracting and ugly LoCA flaws.  I think to imply that it's OK on this Sigma because other lenses have it is too kind.  

 

I don't know that much about optical design and costs, but one reference comparison on the market is the Leica 50mm f/1.4 Summilux and the Leica 50mm f/2.0 Summicron APO.  The latter is a full stop slower (i.e. it's optically HALF the size) but is priced 170% higher than former.  (OK, Leica can charge whatever they want but I'm taking the pricing at face value.)

 

APO does not come easy (i.e. cheap) and that is one of the unique qualities of the Otus so I think it's not informative to lump it in with the other lenses but to add the differences of the Otus to the discussion of the SIgma.

 


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#13 JoJu

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Posted 22 February 2017 - 01:43 PM

Klaus, I have a question about CA. in your report of the lens you state a CA of 0.5 pixel at f/1.4.

 

Pixelwidth means "related to sensor"? And which sensor was in use to measure that width? On the samples of DPReview were a couple of pics which had solid magenta highlights. Is that an overloaded sensor or related to the lens?



#14 Brightcolours

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Posted 22 February 2017 - 04:56 PM

Klaus, I have a question about CA. in your report of the lens you state a CA of 0.5 pixel at f/1.4.

 

Pixelwidth means "related to sensor"? And which sensor was in use to measure that width? On the samples of DPReview were a couple of pics which had solid magenta highlights. Is that an overloaded sensor or related to the lens?

The software measures on diagonals, so it can indeed see "half". However, it is not the most reliable measurement from the software.

The magenta you see in high lights is of the LoCA variety,, the CA from the graph is of the LaCA variety.



#15 Rover

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Posted 16 March 2017 - 07:50 AM

My inner editor is (slowly) getting back to life. I've found this on page 1:

easily capable to handling professional requirements

Which should be "easily capable of handling professional requirements".



#16 mst

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Posted 16 March 2017 - 07:08 PM

Thanks, Rover, corrected.

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#17 mst

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Posted 16 March 2017 - 07:32 PM

I don't know that much about optical design and costs, but one reference comparison on the market is the Leica 50mm f/1.4 Summilux and the Leica 50mm f/2.0 Summicron APO.  The latter is a full stop slower (i.e. it's optically HALF the size) but is priced 170% higher than former.  (OK, Leica can charge whatever they want but I'm taking the pricing at face value.)


Ah, just saw that, and I just HAVE to comment... mainly because I still don't get all the hype around that 50/2.0 APO :)

Surprising fact about the Summilux-M 50/1.4 ASPH: it's an APO lens, too :) Its optical formular is very similar to that of the APO-Summicron 75/2.0, however Leica back then decided to not add APO to the product name of the Summilux... otherwise they'd probably have a hard time now selling the one stop slower lens for double the price ;)

In general, a good APO lens doesn't necessarily need to be expensive. Very likely things get more tricky and difficult and thus expensive with faster glass, but there are relatively fast but still affordable APO lenses out there... just think of the Sigma 150/2.8 for example.

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#18 dave's clichés

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Posted 18 March 2017 - 04:46 AM

Ah, just saw that, and I just HAVE to comment... mainly because I still don't get all the hype around that 50/2.0 APO :)

Surprising fact about the Summilux-M 50/1.4 ASPH: it's an APO lens, too :) Its optical formular is very similar to that of the APO-Summicron 75/2.0, however Leica back then decided to not add APO to the product name of the Summilux... otherwise they'd probably have a hard time now selling the one stop slower lens for double the price ;)

In general, a good APO lens doesn't necessarily need to be expensive. Very likely things get more tricky and difficult and thus expensive with faster glass, but there are relatively fast but still affordable APO lenses out there... just think of the Sigma 150/2.8 for example.

-- Markus

 The 150mm macro?  Yes, with APO in it's name and it's macro focal length gave it a good "hook" although it's not quite a full APO, it still bokeh fringes a tad, but only a tiny tad, let's say a tadlet (technically speaking that is!)



#19 wim

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Posted 18 March 2017 - 01:07 PM

The problem with many APO-lenses is that they do not correct for secondary order aberrations, which means that under certain conditions there still are some fringes to eb seen. There are only few exceptions, and those are generally rather expensive, and not easily obtainable.

 

Kind regards, Wim






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