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Lenses / Canon EF24-70mm f/2.8 M2 vs Sony Zeiss 24-70 on Sony a7R body
« on: April 03, 2014, 12:20:12 PM »
  I was always  interested to know what is the resolution power limit of Canon  EF24-70mm f/2.8 M2  combined with the high resolution body and  how this compares to  similar lense type from different vendors.
On Canon 1DX this is just perfect piece of glass.

  Few days back I received Matabone III adaptor which gave me ability to mount Canon lenses on Sony a7R body.
With that I was finally able to test Canon  EF24-70mm f/2.8 M2  on 36mpx   Sony a7R body.
As result there  is also comparison of image quality  between Canon  EF24-70mm f/2.8 M2    and  Sony Zeiss 24-70 f/4 OSS.

There are two 100% crops at 24mm focal lens and two 100% crops at 70mm  focal lens.
All shots  are done  hand held  using camera autofocus.
Focus speed of Canon  EF24-70mm f/2.8 M2 with Matabone III is very slow - few seconds of hunting and searching for focus peak.
Sony Zeiss 24-70 f/4 OSS  focuses almost instantly.

 RAW files  from  Sony a7R were process using Phase One  Capture One with default settings, no adjustements at all

Test results demonstrate that Canon  EF24-70mm f/2.8 M2 is much superior to Sony Zeiss 24-70 f/4 OSS in resolution and color reproduction and overall image quality .  Especially this is noticable at 70mm focal length .
From test pictures it is obvious that even on 36mpx   Sony a7R body  Canon  EF24-70mm f/2.8 M2 still does not reach it's limit in resolution power.  This combination is perfect one when focus speed is not important.
On the other end  Sony a7R with  Sony Zeiss 24-70 f/4 OSS  is a fairly good combination as general purpose  walk-around point and shoot camera.

I also tested Canon TSE 17  on a7R and image quality , color rendering and resulution is also of top possible quality. 
It seems that Canon TSE 17 the same as Canon  EF24-70mm f/2.8 M2 still does not reach it's resolution power limit on a7R
Canon TSE 17  on Sony  a7R  looks as  perfect  combination for Architecture and Landscape photograpy.

Couple of more samples.
All shots are processed in Phase One Capture One with default setting, only shot with flowers has highlights slider set to 5 % to show more texture on white flowers
I tried a7R with Lightroom 5.3, DXOOptics Pro 9.1 and Capture One and the last gives more pleasant results for a7R files compared to DXO and Light room.
DXO also very good - with default settings output looks better then LR5.3
May be this is personal perception  but to my eye C1 do much better rendering for a7R raw files than LR5.3
Now waiting Metabone adapter to  test  it with Canon TSE 17 glass

Just got my a7R,  very pleased with the convenient controls, very fast AF - expected that it would slower
Did some tests with ZEISS 55 1.8  and  below are some samples - one full image- small size, the other 100% crop  with 100% Jpeg quality, all handheld
Very good addition as walk around camera  to 1Dx

EOS Bodies / Re: Canon's Medium Format
« on: February 14, 2014, 05:46:34 AM »
When they can give me a full frame MF sensor (6x4.5) for about the price of a 1DX I'll start saving for one. :)  (yeah, fat chance, I know)
There is an option there - new Pentax 645D 2014 which will become available probably by mid 2014. Pricewise should be not big difference from 1DX system

Sony is pushing limits with it's  new MF 50mpx CMOS  sensor - vey high IQ at ISO6400:
The IQ250's new Sony-built sensor offers options for medium-format shooters, including high-sensitivity performance up to ISO 6,400; exposures as short at 1/10,000 of a second and as long as one hour; and a dynamic range spanning 14 f-stops for a better ability to capture details in both shadows and highlights. It doesn't take advantage of CMOS sensors' superior ability to shoot video, but that's no surprise or even shortcoming given that Phase One sells machines designed solely to capturing the best still photos possible.

Found  interesting info on  Sony 7R image quality vs. 5Dm3, Nikon D800E and Pentax 645D with 100% comparison crops at different ISOs at imagine -resource:
 Very interesting to see comparison of Canon 5D M3 with Sony a7R  at ISO 3200  both  low contrast high details shorts and for high contrast ones.

Both images are full size files.

I used the very cool MultiExposure method (as I learned here on CR). It's ONE raw file on both images, shadowpushed to +100 in LR, and +40-something with shadows in the tone curve. I was out to really push the shadows as a test, not to create a HDR-image, and this is why the whites are a bit over here and there. I specifically chose a VERY high contrast scene I didn't expect any camera to perform any good at all. And the light is nowhere near as crazy with the things I normally shoot, or care about if the subject looks good.

Those who say the 1d X is dissapointing need to figure out how to use it...
It is pleasure for me  to see that Multiexposure method which I described last year here for 1Dx   is being used providing best possible IQ out of 1Dx.  When 1Dx is also used with extremly sharp 24-70 2.8L M2 or TS-E 17 4L  image IQ is just amazing - it is hard to believe that it is possible- I always amazed with the quality. There is one issue though for Phase One C1 and DXO Pro  white balance for ME files  - I opened the case with both and DXO already reasearched it  and found the problem and will fix it in future releases. Phase One  is still working on that. But root cause is the same - they did not took into account that color balance is already applied by canon  in ME output RAW file and appliying that for second time in SW which result in strong violet color cast for both DXO and C1.  As for now Canon   DPP provides best white balance for ME files- better then Lightroom.
LR4 works fine but Canon DPP  is even better for color balance - no corrections at all are required.

Third Party Manufacturers / Re: Canon may be expensive but...
« on: February 04, 2013, 02:03:39 AM »
@neuroanatomist & @TheSuede :

I think you are both correct but there are two aspects here.
 Hopefully modern sensors are designed in a way to prevent photocell saturation in normal conditions and at base ISO saturation point of photocell (or point just below) should match upper level of input voltage range of correspondent  ADC. This is required to obtain maximum possible DR from the sensor at base ISO.

 With lower light input (so less input photons) higher digital ISO should increase analog circuit gain so less photocell output should be amplified to the same upper input voltage of ADC.
This also explain why sensor DR is reducing 3db with ISO going up one step (for properly designed up do date modern sensors - e.g. from Sony you see that starting from base ISO).
 So for HTP at ISO higher than base ISO negative exposure compensation could be done just by reducing analog circuit gain.
But at base ISO this might not work - we still would need to reduce number of photons by reducing exposure time or using ND filters to prevent photocell saturation.
 Unfortunately there is no freely available information for sensor cell full path gain distribution (from photocell up to ADC) to see actual sensor performance in this respect (for different sensors). This would be interesting to see - actually this is one of the most important parts of the system design.

Third Party Manufacturers / Re: Canon may be expensive but...
« on: February 03, 2013, 01:25:04 PM »
Was reading this thread and could not help but putting some comments.
Let's look at the root of the discussed HTP issue 
What is the blown highlights means for the sensor? 
Really blown highlights ??
This means that photodiode of the photocell got saturated and any increase in number of captured photons cannot increase current via this photodiode .
Anybody is going to argue about that ?
Then what could be the remedy for this?
Answer is simple - reduce the number of photons.
How this could be done?
Use EC to  -1  and then later in processing  change gamma in tone curve to raise mid-tones and shadows  to the level which would be produced if camera  was used with EC=0.
This could be done manually or camera could do that automatically using HTP mode but reporting that all was done with EC=0 , actually cheating camera user.
This all simple physics - anyone could see response curve of the photodiode and understand what it is all about.
It does not matter how you name what is the happening but essence of the process does not change with this.
If photodiode is saturated no further on chip electrical post processing could recover highlights - they already blown.Full stop here.
This is ABC of electical engineering.

Third Party Manufacturers / Re: Hand on SONY RX 1.............AMAZING
« on: December 21, 2012, 04:51:21 AM »
Here is Michael Reichmann RX1 review on much respected -very interesting:


this may not be the most objective site but it's worth a deeper look though (is there anybody objective out there?):
Thanks, very interesting article.
Author is right telling that "It is REVOLUTIONARY instead of EVOLUTIONARY".
This is what I was meaning in my post  telling that they are putting milestone in digital cameras evolution process. Somthing drastically different and starting point of new path in cameras evolution. Step up from what we have now on the market

And here is an  example of RX1  DR range – shadows recovery at iso50

Downloaded and checked RX1 raw files from DPReview  -  image IQ is so good  – nothing comparable I believe in such form factor and beating out  many FF DSLRs.
  Here are snapshots for iso50, iso1600 and iso3200 from Capture One screen using Win7 snippet tool (C1 7.01 already has preliminary support for RX1). No adjustements - C1 default setting.

This is just awesome, I applaud you sony.

+1 Absolutely. SOny might have some odd "standards" but they showed a long time ago that they are SERIOUS about digital photography, and back in the day I had ALL the dsc-p# cameras from Sony, (P10 my absolute favorite) Sync flash at 1/1000s and of the very best looking cameras around. Plus they were about 50 million times faster than the Ixus's.

Sony, you might not be best at everything, but you have the biggest balls and push everyone  else and always go where no concervative Canon or Nikon man will go. Awesome!!! I've been waiting for FF (digital) compact since, hm, ever?

Glad  to see that there are number of people who understand what it is all about in general prospective.
  It was my dream as well to have compact high quality FF mirrorless camera with one of the best lenses so that I could always carry it with me.   And I am very glad to see that achievement from Sony.  It could be  very good complement to the 1Dx – I can use 1Dx for specialty shoots using different telephoto  lenses and RX1 as second camera with normal fixed lens – so I do not need to bother to change lenses on 1Dx when I need wider angle lens and  high quality image.
  To my view this is kind of conceptual camera to show what Sony is capable of now and I think their goal is to show their technologies in action thus putting milestone in digital cameras evolution. Sometimes this is more important than making profit at the very beginning.   Similar to what goldminers were doing in Alaska at earlier times   - putting marks that they reach this territory ahead of others and this is their territory.   Also to do all that in compact body is much bigger challenge and costs more than to do the same in the body which is twice or even more bigger .  Also big challenge is lens optic design for short distance between lens and FF sensor so that all light is fully captured by sensor pixels - to ensure  that light rays are fully orthogonal to the sensor surface at any pixel location on the sensor. And for faster lenses  this is much more difficult than for slow lens. Also this is lens with lens shutter - which is more  common for MF lenses  than for FF lenses (e.g. Schneider Kreuznach  leaf shutter lenses for Phase One 645dDF+ system Only this one is a big difference itself . Also low light performance should be at least 1/3 better than for new Sony A99 as there is no translucent mirror between lens and sensor.
 For me they just captured industry trend (pretty much that is something that you could “feel” in the air) at early stage  and embodied that in RX1.  And  long term evolution vector is towards mirrorless FF cameras with high quality phase detection AF directly on the sensor.   Technologies are already here.  It is now just matter of time and money to put all that in production.  I am sure that in some near  future we will see  number  FF mirrorless compact  cameras having phase detection AF  points all over the  frame  and not only in central area of the frame.
  I think that in some  time we will see pretty interesting review of this camera from Michael Reichmann on There is also already one availble on dpreview -

EOS Bodies - For Stills / Re: Too much dynamic range?
« on: November 25, 2012, 11:46:29 AM »
DR is like USD - the more you have - the more you want    :)
 More DR like more USD gives more freedom and reduces dependencies on different circumstances and this in turn allows to get desired more easily and much  quicker.

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