"Through the eyepiece" the 1DX MKIII will beep on any focus point that is locked and will illuminate when there is perfect focus. That's manual or auto.

If I were to need focus peaking I would use a monitor.

I can't imagine needing magnification through the eyepiece but Canon's angle viewfinder C works perfect for that task.

Sports is one thing, but if you have time the live view or a monitor gives you much more flexibility.

Nice, I see the hog hasn't changed, and the real befuddled- uneducated still yell the loudest.

Your "soyyazzed" reply is "typical" and "promulgated" as expected... lol

As for the 1DX MKIII:

Their are two focus indicator arrows that merge together in "live view" to attain focus. This is the same function as "auto-focus", but you turn the focus ring manually... and the arrows change color... the camera and lens are communicating.

The 1DX MK3 has the arrow function function plus a similar "beep and flash" of the focus point(s) in either live view or through the eye piece as do other dlsr's when manually focusing.

If you try to focus your lens with only your eye's hoping the live view screen or with the eye piece is perfect dead- nut-on, the focus can be in-accurate...

Why on earth would you think a sensor would have anything to do with focus?

I see where you may be "confused" and i'm sure you will have a scathing rebuttal...

I hope you have been properly entertained by an expert!

The mirror-less myth persists when it comes to sharpness and could not be further from the truth. In reality, a tilt-shift lens on a dlsr, especially for corner to corner sharpness is unbeatable.

Few lenses will give the result expected.

The "line resolution rating" of a lens is more important than any mpx rating and is an actual number. Pixels are only a hypothetical or mathematical estimate represented by a phantom number. Resolution has much to do about the lens and less to do about the number of estimated pixels... a great lens on a middle of the road 20 mpx dlsr camera body will outshine a 100 mpx mirror/less wonder camera body with a middle of the road lens on any day... most "kit lenses will only capture half of the body's estimate potential.

These two links are a manufactures web page... Sony's sales perspective.

The Canon 1DX MK3 utilizes focus arrows that merge when using live screen with manual lenses. I use all three of the latest tilt shift lenses (50-90-135) because of the line resolve (more important than pixels for resolution), correction, and corner sharpness superiority.

In eye cup view, there is an audible beep and flashing focus point. Has all to do with the sensor and nothing to do with the mirror. So no, your mirror-less assumption is completely false. Then there is also "focus assistant" when using an external monitor.

A nice tip for manual focus: set a point of focus for the shot, then wait for the beep as the subject hits that point as you hold down the back button focus. It is more accurate and consistent than using the focus motor in an auto-focus lens to track a subject.

Interesting to read the impending doom perspectives. A bit biased from a mirror-less viewpoint I sense, but the end its most likely all true.

As a point, I do own and use a 1DX MK3 and MK2 for my work, and will stay with what I have due to my lens inventory and great performance. I appreciate Canon's software and firmware updates that continue to fine tune both, with the latest just last month... that may be a clue to counter the possible deceptions.

In the end a camera is a just tool with the image the result. Both mirror-less and dlsr's use a shutter, so the only real gain may be live view through the viewfinder with trade offs in speed and action accuracy.
Mirror-less sensors are no different than dlsr, so the image will be no different when comparing the "R's" to Canon's current flagship. Weight has equalized now so that point is no longer important.

Expecting a superior image from a mirror-less camera purchase will be a big disappointment for some.
If I could have anything, I would wish for a dlsr with live view though the viewfinder, and have an additional leaf shutter, plus be large format and shoot 30 fps in total darkness for under 6K... I do remember vinyl, 8- track, cassettes, VHS, Beta, film, and B&W TV's.. I'm betting mirror-less will be replaced as well, just a matter of time.

Canon just updated the firmware for the 1DX MK3... and to my astonishment also the 1DX MK2. The MK2 update includes firmware for the new line of Canon tilt shift lenses, something I needed... Thank you Canon for both of those camera updates and also nice to know you can now buy a new 5D MK4 once again for those interested. There seems to be a place for both mirror-less and mirrored and the continued support from Canon is fantastic on both product lines, especially for the MK2 that I never expected. Love my MK3 for its convenience, but the Mk 2 still performs great and I can't see parting with it any time soon. I think the ultimate camera will be a hybrid of mirrored and mirror-less perhaps.

Plastic UV filters may be the best possible advice. They are inexpensive, won't shatter, and will save "mucho" dollars by not wiping out the front glass lens coating like glass UV's will when that bad moment happens. Best of all, the ones made from recycled grocery bags will defiantly contribute to saving our beloved planet... all great trade offs when image degradation takes a back seat. Always remember... "safety comes first"

As for the magazines I currently work for, the terms "photographer" and "journalist" are separate terms. Some contributing are photographers only, and others like myself photograph and write the stories. I am considered an "editor" by definition, but the name "journalist" is used for my printed title, not "photojournalist". Perhaps the definition for "photojournalist" may be changing. A professional "photographer" will generally be able to cover a wide range of conditions including "catching the moment", but even an amateur or cell phone can capture an image that needs no words to explain... for me, I have nothing but admiration for when that happens.

For shutters, the so called "blackout" period of a mirror has never been any issue for me, nor the need to see a live view very important. I actually find that distracting.
Sure, a Fugi GFX is great, and I have owned two mirro-less cameras to date, but... at the end of the day, when milliseconds count or light conditions are poor, my Canon 1DX MK3 will bring home the bacon in more situations.
Purchasing a camera for it's sensor "rating" in size, pitch, area and density is way more important than what shutter is going to uncover the sensor in hundreds, or thousandths of a second.
Then there's more... and more... and more megapixels. That's another deceptive sales tool that can reduce your odds of success.

"Pixel pitch", "size", "area", and "pixel density" are always more important than pixel count. All cameras are rated by these numbers, but rarely understood. Camera manufacturers see the power in selling pixels for sure...
Unless you are printing, don't get over sold by megapixel counting... Unless you are printing large, a 12 to 18 megapixel camera will have plenty of resolution for online media.
Actually though... Pixels really do not exist, but instead are a measuring standard per square inch of what can be produced in "pixels". Only a select few lenses will produce that maximum pixel resolution of a sensor's potential. A "sharper" lens will produce more resolution, and it is not uncommon to only get 60 to 90 percent of a cameras maximum potential because of the lens quality.
Sharpness is another thing that doesn't exist. That is a "perception" of "edge contrast".
The 20 megapixel Canon 1DX MK3 for example, will produce a 5472x 3648 image with a 6.55 pitch, 42.9 area, and 2.33 density. These qualities, and especially the "pitch" is why this camera can produce great images, especially in low light.
The amount of light captured in a "pixel", means a high megapixel (smaller pixels) count will bring compromises when it comes to its light gathering ability. Those high megapixels will give you more perceived edge contrast, but at a cost.
If you are serious about choosing a superior camera body/ sensor, you need to consider these four points over megapixel count. If you need more "megapixels" for landscape for example, then use a tilt- shift lens. This will produce an image equal to a medium format camera, and give you the ability to print massively large... plus you still get all of the advantages like speed, superior pitch, large pixel size (light gathering ability) area, and density.
A billboard is printed at 2 megapixels, so that example means "viewing distance" is a further consideration. Unless you have your nose "pixel peeping" inches from a print, you will not need massive resolution. Detail is important, but viewing distance can be a bigger consideration. The same is true with what is displayed on most computer monitors.

I recall loving my 8-track and being so disappointed in the bass response when hearing cassette for the first time back in the '70's. Same with Beta... I just loved my Beta machine.
I have owned a few mirror less now and do have a Fuji x100 I like... But, so far I am not so happy with the "cell phone" color and forensic detail when it gets down to editing. Megapixels are one thing, and pixel quality is another. When it comes to color, tone, detail, and accuracy, my hybrid 1DX MK3 is more than impressive when I compare it to other images I have worked with, and functionality of the camera body is perfect for me. There are pros and cons to everything, but I do think mirrors will be around for a long long time.

She was gone for a while, but came back with her twisted vision of educate she expects others. Too bad.

I just need to figure out the unsubscribe method... I don't see it? any tips?

You just don't seem to get it...

But I love your classification of the "uninspired and over 70". I think you lowered the bar to the lowest notch.

No one including myself is pushing "unsolicited critiques" in the retirement section, period... I's a taboo for the exact reason you keep dictating in your description.

and no I gotchya you

I will now end my subscription. Farewell