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next PZ lens test report: Sigma 50-100mm f/1.8 DC HSM ART


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#1 Klaus

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Posted 15 June 2017 - 01:31 PM

http://www.photozone...a_50100_18canon

 

Quite nice but the borders and the foreground bokeh could be better.


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#2 toni-a

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Posted 15 June 2017 - 03:39 PM

Dunno why I am the only one interested in the your photography in the review.

Seems MFT is much more inspiring for your creativity...

Good you included a portrait shot maybe for the first time. although you overexposed it  a little bit and took in harsh contrast settings, like your reflection in the glasses though

http://www.photozone...&c=2E8A0343.jpg



#3 Rover

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Posted 15 June 2017 - 03:43 PM

Wait... is the lens weather sealed? This is the first time I hear about this...



#4 AN2

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Posted 15 June 2017 - 04:30 PM

A trivial issue: 1 SLD should be 4 SLD.



#5 JoJu

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Posted 15 June 2017 - 04:36 PM

Well, with all my reservations of calling a lens "weather sealed" because there's a rubber gasket round the mount (I was just briefly looking around Sigma's descriptions and didn't find "weather sealing" as a term or a promise), it does help a bit having that gasket (instead of none). I just would not try every kind of weather unless I had to do so.

 

It might be a cool portrait lens for a Nikon D500 as well...

 

I can agree with all the review especially the tripod foot - half hearted. I just wish, Sigma would take a look to the Tamron feet and make it 1 cm long with a swallow tail - that would make a lot of people rather happy, I guess.



#6 Klaus

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Posted 15 June 2017 - 10:13 PM

Yes, sorry - no weather sealing - and 4xSLD elements,


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#7 dave's clichés

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Posted 16 June 2017 - 08:36 AM

   Good review Klaus!

 

   No doubt about the lens's IQ all in all, although it's weakest at the image borders at 50mm (maybe a tad weaker on the Nikon 1.5X sensor), good bokeh and superlative center sharpness and pretty much everything else.

   However I can't help thinking that with it's limited focal range and large size and weight, (1.5 Kgs is approaching the 1.9 Kgs of the Tamron A022 without tripod mount)  whether, one  85mm portrait lens and the  "nifty fifty" that finds themselves in most owners kit bags,  might cover most bases without recourse to another huge lens, many may own the advantageous F1.4 versions.



#8 Brightcolours

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Posted 16 June 2017 - 08:42 AM

;) Good review Klaus!
 
   No doubt about the lens's IQ all in all, although it's weakest at the image borders at 50mm (maybe a tad weaker on the Nikon 1.5X sensor)

How about the Nikon 1.51x sensor? Or the Nikon 1.53x sensor? Or the Nikon 1.56x sensor?



#9 Rover

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Posted 16 June 2017 - 08:53 AM

Yes, sorry - no weather sealing - and 4xSLD elements,

So, not even an ass-gasket? (the product shots aren't clear in this regard). I know the Arts probably started getting sealed with the 12-24 and the 85 but I'm never sure since I'm just a review junkie and never handled any of them.
Hopefully within a few years Sigma starts refreshing these lenses, adding proper weather sealing to the Mk.IIs. Come to think of it - the first Art/Sport series lenses are (almost) five years old by now! Time does fly.

#10 dave's clichés

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Posted 16 June 2017 - 09:26 AM

How about the Nikon 1.51x sensor? Or the Nikon 1.53x sensor? Or the Nikon 1.56x sensor?

 

   Errrr.....I don't know these!.......like...... how about them.....  pray tell?



#11 Brightcolours

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Posted 16 June 2017 - 10:06 AM

   Errrr.....I don't know these!.......like...... how about them.....  pray tell?

The sensors used by Nikon (and others) don't always have the same size, and more often than not are not exactly 1.5x crop.

Take the Nikons D40/50/60/70, for example, had a 23.7mm sensor width, so 1.519x crop factor. This is the biggest size by the way, so it should really be called 1.52x crop.

The D500 has a 23.5mm sensor width, so 1.532x crop factor. The Nikon D3200's sensor has 23.2mm width, 1.552x crop. The D3100, with 23.1mm sensor width, 1.558x crop.

 

My EOS M has a sensor width of 22.3mm, which makes it 1.614x crop. My EOS 6D has a 35.8mm sensor width, making it a 1.0056x crop.



#12 Rover

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Posted 16 June 2017 - 10:18 AM

So do we have to calculate strict equivalence for each and every of those formats before we can go shooting - lest we end up with a forbidden equivalent unit? :D


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#13 Brightcolours

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Posted 16 June 2017 - 10:28 AM

So do we have to calculate strict equivalence for each and every of those formats before we can go shooting - lest we end up with a forbidden equivalent unit? :D

Yours has a crop factor (compared to 135 format) of 1.290x. Now you know why everything always turned out wider than you anticipated!

 

On a more serious note, the Sigma Quattro H has a crop factor of 1.353x, yet most of the times just gets called "1.3x crop" or "APS-H like Canon's 1D series". In this case, it is handy to know that the difference can be noticable.



#14 JoJu

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Posted 16 June 2017 - 11:13 AM

Why should a APS-C lens be weaker on an APS-C sensor, dave? The center remains the same and as Klaus asked " Do you really need tack sharp corners at f/1.8?" resolution of 7D MkII and D500 are just the same, so the real question is "have you ever missed a high quality fast standard zoom in that range of FL?" and the next question "...and are you willing to carry it's weight around?"

 

Like with the 18-35/1.8 there is nothing to compete with - as fast and as zoomy, that is. After Sigma's fantastic 50-150/2.8 APO, there's not much choice for fast short tele zooms. There are fixed FLs better than those two zooms - but also no lightweights. To me it appears Sigma is the only manufacturer really caring about APS-C although it's an illusion to get cheap, light and sharp APS-C lenses. They make it like more for their own APS-C/APS-H cameras. And those are more demanding than other products.

 

Klaus mentioned also a fast AF - so you have a nice fast indoor sport zoom, even concerts or theater lens. In all situations when I have the choice to loose the shot because I cannot change lenses fast enough, this thing would have relaxed my stress. When I look back I remember a lot of situations when such a lens would have been the solution. Together with a second body and the 18-35.

 

In low light situations nobody will miss cover performance - you even can't focus in the corners with most APS-C DSLRs and the noise will be killing more resolution than the lens does.



#15 dave's clichés

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Posted 16 June 2017 - 11:59 AM

The sensors used by Nikon (and others) don't always have the same size, and more often than not are not exactly 1.5x crop.

Take the Nikons D40/50/60/70, for example, had a 23.7mm sensor width, so 1.519x crop factor. This is the biggest size by the way, so it should really be called 1.52x crop.

The D500 has a 23.5mm sensor width, so 1.532x crop factor. The Nikon D3200's sensor has 23.2mm width, 1.552x crop. The D3100, with 23.1mm sensor width, 1.558x crop.

 

My EOS M has a sensor width of 22.3mm, which makes it 1.614x crop. My EOS 6D has a 35.8mm sensor width, making it a 1.0056x crop.

 

Don't forget the height BC!

 

 

 So the D40 has a 23.7mm sensor width but with a 15.5mm height.  = 367.35 mm2

 

The D500 has a 23.5mm sensor width but with a 15.7mm height      = 368.95mm2   that's an increase of 1.6 mm2

 

How that fits in with the multiplication factor i don't know.  Perhaps you could enlighten us here?

 

  The Canon 80D has a 22 X 15mm size  = 330 mm2........  38.95mm2......less!

 

  The Nikon D500 sensor is therefore  1.118 X larger than the Canon D80 APSc sensor!

 

 Not far off the difference between MF and FF............... <_<

 

 

  I know you like that one BC..!!!   .......... :lol:  :lol:  B)  :D  :P  ;)  :rolleyes:  :huh:

 

  (The biggest Nikon DX sensors are the D3000/D20/D300 in terms of surface area)



#16 JoJu

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Posted 16 June 2017 - 12:32 PM

I suggest you guys meet and count the pixels with a magnifier. You simply can't be too careful with equivalent areas...



#17 Brightcolours

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Posted 16 June 2017 - 04:04 PM

Don't forget the height BC!

 

 

 So the D40 has a 23.7mm sensor width but with a 15.5mm height.  = 367.35 mm2

 

The D500 has a 23.5mm sensor width but with a 15.7mm height      = 368.95mm2   that's an increase of 1.6 mm2

 

How that fits in with the multiplication factor i don't know.  Perhaps you could enlighten us here?

 

  The Canon 80D has a 22 X 15mm size  = 330 mm2........  38.95mm2......less!

 

  The Nikon D500 sensor is therefore  1.118 X larger than the Canon D80 APSc sensor!

 

 Not far off the difference between MF and FF............... <_<

 

 

  I know you like that one BC..!!!   .......... :lol:  :lol:  B)  :D  :P  ;)  :rolleyes:  :huh:

 

  (The biggest Nikon DX sensors are the D3000/D20/D300 in terms of surface area)

Dave, the crop factor can be calculated just from the width. Or just from the height. Or just from the diagonal. As the sensors all have a 3x2 aspect ratio. The weird 10mp CCD from the D200 and consorts oddly enough is not a true 3x2 sensor. 



#18 dave's clichés

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Posted 16 June 2017 - 07:02 PM

Ok thanks BC, I would use the diagonal as it takes into account both sensor dimensions!






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