December 12, 2017, 12:06:32 AM

Author Topic: DXO Test on 16-35mm from sony  (Read 4006 times)

Ryananthony

  • EOS 6D Mark II
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Re: DXO Test on 16-35mm from sony
« Reply #15 on: October 17, 2017, 03:15:43 AM »
I was suraised to realise that both the Sony 16-35/4 and 16-35/2.8 both extend going through the zoom range. I've never shot with an ultra wide that did that.

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Re: DXO Test on 16-35mm from sony
« Reply #15 on: October 17, 2017, 03:15:43 AM »

ahsanford

  • Canon EF 600mm f/4L IS II
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Re: DXO Test on 16-35mm from sony
« Reply #16 on: October 17, 2017, 03:53:09 AM »
I was suraised to realise that both the Sony 16-35/4 and 16-35/2.8 both extend going through the zoom range. I've never shot with an ultra wide that did that.

The 16-35 f/4L IS and 16-35 f/2.8L III's front element moves with zooming, but not like a 24-whatever standard zoom does.  It moves behind the front rim of the outer lens barrel.  So it doesn't actually change physical length as you use it. 

You can see what I mean here:
https://www.the-digital-picture.com/Reviews/Lens-Product-Images.aspx?Lens=1073&LensComp2=0&LensComp=949
(mouseover the non-hooded 'select view' options below the lens shots to see what I mean)

Can't speak for which 16-35 for Sony you are referring to (I get mixed up between A / FE Sony options and the Zeiss made FE options), but I believe one of them actually trombone extends like a 24-something zoom but in reverse -- 16mm is the longer configuration while 35 is the shorter configuration.

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SecureGSM

  • EOS 5D Mark IV
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Re: DXO Test on 16-35mm from sony
« Reply #17 on: October 17, 2017, 05:38:19 AM »
that was a joke of course.

Are you saying there is a AF consistency problem with  MILCs now?
There is none in my books :)
What about MF lenses? Zeiss Otus glass is second rate now?  ;D

Have you seen the AF testing on the Otus?  Wow.  Worst AF LensTip ever tested.

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jeffa4444

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Re: DXO Test on 16-35mm from sony
« Reply #18 on: October 26, 2017, 12:24:48 PM »
Working as I do in an exacting industry where lens results are projected onto movie theatre screens in everyday motion picture shoots the testing conducted by DXO is questionable.

All our lenses are measured against the theoretical specification we applied at the design stage where we manufacture lenses. Copy to copy variance will happen mainly due to mechanical set-up rather than optical but even optically you can have a variance albeit normally quite small. The testing is done on an MTF machine and on optical projectors which are calibrated and checked often in a controlled room (we also test f / T stops). The camera is separately checked for flange focal depth & sensor alignment and then finally the lens is tested on the camera both on test charts and projected images from a live feed. Of the tools I would say the optical projector is just as important if not more so than the MTF machine and simply testing a lens on a camera for a company like DXO is amateur.

Ive tested my copy of the Canon EF 16-35mm f4L IS USM on the projector and projected in our theatre on a 5DS, yes its one example but the results are extremely good and we test lenses from all the major brands and our results are at odds with DXO. 
Canon 5DS, Canon 6D, Canon 6D MKII,16-35 f4L IS USM, 17-40 f4L USM, 28 f2.8, 24-70mm f4L IS USM, 24-105 f4L IS USM, 100mm f2.8L IS USM, 70-200 f2.8L IS USM II, 70-300 f4-5.6 IS USM, 50 f1.8 STM, 100-400mm f4.5-5.6L IS USM II, 1.4EX III, EOS 760D, EF-S 10-18mm f4.5-5.6 IS STM & others.

3kramd5

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Re: DXO Test on 16-35mm from sony
« Reply #19 on: November 16, 2017, 09:22:39 AM »
The “right” way to use DXO’s lens numbers is to see how various lenses perform on camera bodies you’re interested in, or vice versa. Comparing across mounts is pointless.
Some Canon, some Nikon, some Sony, some Olympus

aceflibble

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Re: DXO Test on 16-35mm from sony
« Reply #20 on: November 21, 2017, 08:22:19 PM »
ITT a load of people who don't understand how DxO works, what DxO intends, or have even bothered to attempt to read DxO's explanations of their measurements.

DxO's measurements for the 16-35 mk III line up with my experience using seven different copies of that lens, on three different bodies. Seven across three is a pretty decent sample size in my book—far more than the average consumer will get through—and when that experience matches up with DxO's numbers (which, contrary to what some eejits in this thread have insinuated, DxO do explain), I see little reason to doubt them or give it a second thought.

As for why the 16-35 and 24-70 test so differently, you'll find that is the nature of all wider angles when pitched against longer focal lengths. Longer lenses inherently have finer resolving power as details are larger and not all smashed into a smaller pixel count. Hence all the lenses rated toward the top end of sharpness are >50mm and very few wide-angle lenses manage to resolve detail matching more than about two thirds of any given sensor's pixel count. (With a few scattered exceptions.)

When you zoom in, details get bigger and more easily-defined. Who ever would have thought?

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Re: DXO Test on 16-35mm from sony
« Reply #20 on: November 21, 2017, 08:22:19 PM »