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Sigma 50-100mm f/1.8 HSM DC ART ...


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#1 Klaus

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Posted 07 June 2017 - 12:19 PM

... arrived in da lab.

 

Let's see whether there's still life in APS-C DSLRs ...


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#2 toni-a

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Posted 07 June 2017 - 12:42 PM

Quite a nice surprise to see you testing this one.
I am actually considering it.
Can you do please some focus accuracy tests, since that's the main problem I am fearing with this lens.

#3 Brightcolours

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Posted 07 June 2017 - 01:02 PM

Focus accuracy of a certain lens is very dependent on which camera body you test.



#4 Rover

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Posted 07 June 2017 - 02:56 PM

I thought you were going to skip this one. Waiting for the review, this is probably a very cool unit.

 

But the tripod mount looks iffy, like some old Nikkor lenses of yore.  ;)



#5 JoJu

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Posted 07 June 2017 - 02:59 PM

The lens is heavier than most plastic bodies behind it...  :D it's just not to rip the mount screws out of their threads



#6 Rover

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Posted 07 June 2017 - 03:02 PM

I was under the impression that this lens is more likely to find itself on some of the more high-end (= robust) bodies like D500, 7D Mark II or even 1D Mark IV than on the SL1 or whichever Nikon is equivalent...



#7 JoJu

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Posted 07 June 2017 - 03:30 PM

Might be, but the lens is also availbale in Sigma mount. That means, for the sd quattro and sd quattro H. These cameras have a comparably small area round the tripod mount. I'm sure nothing would break, but the lens is better balanced with it's own mount.

 

However, this goes for the most of the Art-bricks.  :wacko: this one is 1.5 kg. Happy workout, Klaus  :D



#8 Rover

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Posted 07 June 2017 - 04:06 PM

Well, you want performance, you be prepared to handle big lenses. (Favourable) exceptions apply, of course, but they're only there to confirm the rule. :)



#9 JoJu

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Posted 07 June 2017 - 05:18 PM

Oh, I'm absolute happy with my Art lenses. My back is not, but who cares  :rolleyes:? I just would like to know where's the limit for Sigma to put a tripod foot underneath. I was not aware that the 50-100 is the heaviest Art lens currently available.



#10 Klaus

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Posted 07 June 2017 - 11:30 PM

I thought you were going to skip this one. Waiting for the review, this is probably a very cool unit.

 

 

I didn't want to ;-) but my usual rental shop had a couple in stock.


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#11 you2

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Posted 08 June 2017 - 01:01 AM

Ouch. That will be fun on your next hike :)  Do you plan to carry it to the top of the  Himalaya ?



#12 Klaus

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Posted 08 June 2017 - 07:27 AM

Ouch. That will be fun on your next hike :) Do you plan to carry it to the top of the Himalaya ?


Hiking with this? Nooo wayyy. 😉
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#13 toni-a

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Posted 08 June 2017 - 07:31 AM

Maybe it's too early to answer since review is not over yet, however for portraits which combo should be better, getting this one on APS-C or getting the classic 70-200f2.8 on full frame since I've got both systems, the advantages of weight and size APS-C has don't seem to  stand up anymore with this one



#14 Klaus

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Posted 08 June 2017 - 08:19 AM

It can't be any smaller. Lenses of the same equivalent specs have the same weight/size plus/minus a bit (notwithstanding fresnel lenses).

This is a "80-160mm f/2.9" lens. 


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#15 JoJu

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Posted 08 June 2017 - 08:27 AM

NO, IT'S NOT! 

 

Otherwise it would be specified as such one. Please stop this equivalencing shit - on Nikon it's a different equivalence, on Sigma sd quattro H again another one - and since no AA filter is involved, you get different airy disks. Your reply is generalizing and therefore wrong.

 

DoF is no exact science and depending on sensors, Anti Aliasing filters and print scales. The speed of a lens in terms of aperture is remaining and for some, if not most buyers of fast lenses much more important than this crappy, lousy equivalencing blurb.



#16 Brightcolours

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Posted 08 June 2017 - 09:43 AM

It can't be any smaller. Lenses of the same equivalent specs have the same weight/size plus/minus a bit (notwithstanding fresnel lenses).

This is a "80-160mm f/2.9" lens. 

You have to add "on Canon APS-C". And to not trigger JoJu, you better write "equivalent to FF" instead of merely putting in between "". 



#17 Brightcolours

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Posted 08 June 2017 - 09:46 AM

NO, IT'S NOT! 

 

Otherwise it would be specified as such one. Please stop this equivalencing shit - on Nikon it's a different equivalence, on Sigma sd quattro H again another one - and since no AA filter is involved, you get different airy disks. 

Haha, who would have guessed that Airy disks (pattern resulting from diffraction in the optics) would change because one uses or not uses an AA filter in front of a sensor.

 

To Paraphrase youyou, "Your reply is just wrong."  ;)



#18 Klaus

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Posted 08 June 2017 - 09:48 AM

NO, IT'S NOT! 

 

Otherwise it would be specified as such one. Please stop this equivalencing shit - on Nikon it's a different equivalence, on Sigma sd quattro H again another one - and since no AA filter is involved, you get different airy disks. Your reply is generalizing and therefore wrong.

 

DoF is no exact science and depending on sensors, Anti Aliasing filters and print scales. The speed of a lens in terms of aperture is remaining and for some, if not most buyers of fast lenses much more important than this crappy, lousy equivalencing blurb.

 

This is an APS-C lens with an APS-C image circle - you may argue with 1.55x or 1.6x there but that's about it.


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#19 Brightcolours

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Posted 08 June 2017 - 09:54 AM

This is an APS-C lens with an APS-C image circle - you may argue with 1.55x or 1.6x there but that's about it.

Or 1.51x or 1.53x, it very much depends on which sensor in which Nikon APS-C body.

 

Klaus, since you have the lens and the bodies to try, could you mount it on the 5DS-R to see which part, if any, this lens actually will provide an FF image circle? 

I know that most UWA zooms will have no black vignetting at the longer part of the zoom range, and that most standard APS-C zooms have no usable range on FF. How is that with this portrait zoom? Is the long end actually black vignet-free?



#20 JoJu

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Posted 08 June 2017 - 10:30 AM

This is an APS-C lens with an APS-C image circle - you may argue with 1.55x or 1.6x there but that's about it.

 

1.6 to 1.34! The lens also covers the new Sigma Foveon APS-H. 

 

You were referring to the lens, not to the limits or crop factor of Canon APS-C size. Ignoring the speed of the lens, which is the reason for it's size, price and weight is the result of this silly equivalence games.

 

You also would not "equivalent" a remote controlled model racing car going up to 100 km/h to be 2000 km/h fast because the genuine "FF"-car model is 20 times bigger. 100 km/h = 100 km/h.

 

Also, FF is just one of many sensor sizes. Given the amount of phone cameras and their sensor sizes, there's no reason to declare FF to a reference. Not many of today's daily camera users ever took pictures on film - or full frame cameras, which are NOT the center of photographic world anymore. So, I think it's better to use the true specifications and not equivalence numbers.






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