amacal1
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 p.2 #13 · Pre-order: Canon 1DX Mark III ($6500) | |
arbitrage wrote:
Some points I found interesting in the White Paper:
1) (Depending upon lens + extender combination) AF with effective f/8 maximum aperture lens + compatible Canon EF tele extenders, at up to all 191 AF points, and cross-type AF coverage at up to 65 AF points at f/8.
2) And, this is the first Canon AF sensor for digital SLRs (viewfinder shooting) to directly output digital data, right off the sensor. Previous EOS cameras with traditional line-based AF sensors required an analog-to-digital conversion step for AF sensor information, before sending it to the processor handling AF data.
3) During viewfinder shooting, the EOS-1D X Mark III adds a dedicated DIGIC 8 processor, previously Canon’s highest-performance processor, strictly for AF management and control of the 400,000 pixel RGB metering sensor.
4) Along with faster internal AF speed, Canon engineers have developed an entirely new AF data processing sequence and procedure — an AF algorithm — now called AI Servo AF IV. This is a substantial technological update, leveraging all the AF system improvements we’ve discussed, from the new AF sensor to the new DIGIC 8 AF processor and overall DIGIC X primary processor.
5) One specific improvement in AF system speed is that the rate of separate AF detections during AI Servo AF shooting is significantly faster in the Mark III camera. In other words,
in the brief fraction of a second between shots at up to 16 fps, when the mirror is in its down position, the AF system performs more sampling operations, more separate AF readings.
6) Two additional areas of AF performance with moving subjects have been specifically enhanced with the EOS-1D X Mark III, and its through-the-viewfinder AI Servo AF with moving subjects. These are based on processing improvements within the new AF system of the Mark III:
• Improved AF performance when shooting through heat-induced “haze”
(the shimmering “heat waves” that can appear on hot days, especially with distant subjects using long super- telephoto lenses).
• Superior AI Servo AF consistency when focusing upon subjects moving away from the camera.
I had to laugh a little bit at these two improvements....not sure I need better AF for heat haze ruined birds flying away from me 
7) Select Case AUTO — camera reads subject and movement, and assigns the Case it feels best captures that movement. It’s auto adjustment of details of AI Servo AF settings, with ability to adjust on-the-fly as subjects and situations change.
* Totally new capability
* Incorporates the potential variables of Case 1 ~ 4 on the EOS-1D X Mark III
8) In both viewfinder and Live View shooting, AF Priority (People) means exactly that... Canon makes no claims that the EOS-1D X Mark III can recognize and focus upon faces of animals or other non-human subjects.
9) Turning off “people” subject detection is also a valid AF setting, in situations where the user may want the camera to be able to track a moving subject — such as a motorcycle on a curvy mountain road, an animal or bird moving across the frame, or any other non-human subject. With AF priority (People) turned off, the camera still can initially grab focus upon this type
of subject, and then follow it (within the active AF Area) as it moves across or up/down around the frame.
The linking of the 191-point AF system with the separate, 400,000 pixel RGB metering system, gives the Mark III a powerful system to initially read your primary subject’s color, shape and relative size in the finder, and then identify that as you begin to shoot. For instance, if the subject was a yellow car, it’s relatively easy to put the initial AF point upon the subject (Initial Servo AF pt. on the 4th magenta-colored AF menu screen; see below), and let the viewfinder’s 191-point AF system track that car as it meanders around to different parts of the frame.
10) Dual Pixel CMOS AF is able to work with lens + extender combinations having maximum effective apertures as slow as f/11. (Viewfinder-based AF can function at effective maximum apertures of f/8 or faster.) This opens the door to autofocus during Live View shooting with extreme telephoto combinations, such as an effective 1,600mm with the EF 800mm f/5.6L IS and a Canon EF 2x III tele extender.
11) AF Method (similar to “AF Area”): Large Zone AF (vertical) and Auto AF Point Selection are available. Live View adds an option for horizontal Large Zone AF, not possible during viewfinder shooting with the 191-point AF array. Note that in Live View, the choice of AF sampling size is referred to as “AF Method;” AF Area is used in menus during viewfinder shooting.
12) This is Canon’s most sophisticated metering sensor to date: an approximately 400,000 pixel, CMOS RGB + IR sensor, in some ways analogous to a small digital imaging sensor. Reading light and color, this metering sensor also provides subject recognition technology during viewfinder shooting, and subject tracking capabilities exceeding those of any previous Canon EOS digital SLR.
The metering sensor teams up with the new, square pixel AF sensor during viewfinder shooting, assisting the AF system with its subject detection capabilities. The metering sensor, with its color recognition capabilities and 400,000 pixel resolution, can recognize an initial subject, and then update the AF system as to its location during Zone AF, Large Zone AF, and Auto AF Point Selection shooting through the viewfinder.
13) New 20.1MP, Canon CMOS sensor
As mentioned above, new sensor architecture attacks high-ISO noise at the pixel level, meaning less noise before brightness signals ever reach the primary processor.
14) While Canon engineers are careful not to over-promise on results users should expect, overall preliminary comparisons of images show about a 1-stop improvement in general noise performance vs. the previous EOS-1D X Mark II camera.
Another benefit: RAW image files are tuned to deliver better high-ISO noise results, before any noise reduction steps are applied. This is in anticipation that many users will ultimately process RAW files in 3rd-party RAW conversion software.
If you fully read this section in the white paper the 1-stop seems to be referring to in camera processed file but they are also claiming better noise on a RAW file (just not saying it is 1 stop)
15) Traditionally, low-pass filters are a very precise, layered set of thin, “glass” filters immediately in front of the image sensor in digital cameras. Typically, they take a single incoming light ray, and divide it by the width of one pixel into four different rays. This scattering of light can lower the appearance of sharpness at high magnifications, but it’s been proven over the years to minimize risk of moiré patterns, and false colors.
What Canon has done is implement an entirely new low-pass filter concept. In the EOS-1D X Mark III, the high detail low-pass filter divides incoming light rays into 16 separate beams, not just four. This point-image separation is optimized for this image sensor, so it improves apparent detail and resolution, while simultaneously separating incoming light into eight radial directions — significantly lowering the risk of rainbow-like moiré patters, in distant repeating linear detail, or extremely fine subject patterns. In particular, risk of false colors or patterns in diagonal linear subject detail is significantly reduced (moiré is reduced to approximately 1/4th the level previously possible, without lowering visible image detail and resolution), according to Canon engineers, with this new low-pass filter.
I won't quote it here but there is an entire page dedicated to defending the choice of 20MPs in a world of 50MP+ sensors
16) Smart Controller suggestion:
What some users may want to try is to disable Direct AF Point Selection at the Smart Controller, and activate Direct AF Point Selection at the Multi-controller instead.
Now, quick changes in AF point location can be made at any time, via the 8-way Multi- controller. The Smart Controller can be used without hesitation for back-button AF activation, by pressing it straight in. And any time fast, major AF point location adjustments are desired via the Smart Controller, just press the AF Point Select button first, and quick thumb movements on it will rapidly move AF points around the active area....Show more →
Sounds like they put their thinking caps on and really made a fine image capturing system. For the pros that appreciate it, it sounds like they'll be pleased. I still fully expect the Twitter and YouTube reviewers to have a field day with Canon's 20MP flagship. I doubt it will really matter, though.
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I am really interested in the 400mm Mk III.on this body. Retains AF in crop 4k so I am happy