P: Development in Tethering capturing

I agree about Loupe Overlay. It dates from Lr4, but I am not surprised if anyone fails to notice it or see that it relates to tethering.

By syncing a collection I am exploiting LrMobile. You probably know that any collection can be "synced", meaning images added to it are automatically synced up to Adobe's servers (as smart previews). And you can "share" that collection - ie make a url which others can see in web browsers. Now, back in the tethering startup dialog, you just tell LR to add new tethered photos to a collection that you have already "synced" and "shared".  They are automatically uploaded and can be reviewed wherever the viewer happens to be. People can "like" and add comments which you see in Lightroom, so they might say "can you crop out xyz?" and you then do the edit and can comment back "is this what you want?" etc. An option lets them download 2048 px images, and you can even set up remote editing (only if you share an Adobe account which is probably more useful for an assistant than a client). Sure, you can get similar remote access via screensharing, providing you have those skills/tools, but what I am describing is simply using Lightroom's built-in features and any device capable of browsing the web.

Loupe Overlay — totally buried, totally missed this one. You're right it's there! That's easily missed for sure though. Thanks!
Not sure what you mean by syncing a collection. 

Thanks, your right! There is a default F12 keyboard shortcut for camera triggering —  Sure enough Adobe does have a "Trigger Capture" menu item, buried within the "Tethered Capture" submenu.
I have from time to time looked though the software in obvious places, such as the onscreen keyboard shortcut ref that can be summoned (⌘ ?), and even googled around to no avail, I never managed to come across this  before.

Still, I have some issues Adobe.

• Why is there no mouseover tool tip on the GUI capture button to hint at the keyboard shortcut?
• A full official list of Lightroom keyboard shortcuts does not include  "Tethered Capture" f12 ?  https://helpx.adobe.com/lightroom/help/keyboard-shortcuts.html
• Having a Function key (F12) is a poor choice for default. Many pro users set global keyboard shortcut keys to function keys. I for example, have F12 set to hide and show Apple's Notification Centre. And many users of course have their Media keys enabled over function keys, making the trigger a bit more awkward. Worse still, for anyone on a TouchBar Macbook Pro, that would then make triggering a capture a non tactile button? Weird...
• While I am aware that keyboard shortcuts can be changed via the Mac's "Keyboard"  System Prefs (I just set mine to ⌘ K and reassigned the previous holder), doing so requires a bit of additional fuss. A Keyboard shortcut pane for setting and reassigning  should be there inside of Lightroom.

There are no "overlay" options, Capture One Pro allows for an image to be overlaid so that a layout or composition can be composed to fit perfectly to an art directors layout.

View > Loupe Overlay was introduced specifically because of this requirement.

There is nothing like "Capture Pilot" for monitoring and review on multiple platforms

When you start tethering in LR, select a collection which is synced. New photos then appear on any device, local or remote, without installing any apps anywhere. I've used this to run a shoot in London for a client reviewing in Paris (not sure I could do that with built-in tools in C1). But I do like Capture Pilot.

Obviously C1 is better than LR at tethering. But given PhaseOne's market, it simply has to excel in that area.

There isn't even a keyboard shortcut for taking a picture while tethered in Lightroom

Is F12 not working for you?

To the Adobe officials commenting in this thread:
First of all, thank you for engaging about feedback for the seriously lacking Tethering issues in LR.

As for the issues:

Quite simply, open up Capture One Pro and use it, then do the same with Lightroom.
The pain points are obvious.

• LR is slower than C1P — previews of new captures while tethered show up painfully slow, exported images process slower, etc.
• LR lacks "live view", software powered focus adjustments, and many camera related technical controls that C1P has.
• There are no "overlay" options, Capture One Pro allows for an image to be overlaid so that a layout or composition can be composed to fit perfectly to an art directors layout.
• There isn't even a keyboard shortcut for taking a picture while tethered in Lightroom. That's insane. Especially when you consider that  every pro photographer, assistant, or even art director knows ⌘+K (for Capture One)
  
• There is nothing like "Capture Pilot" for monitoring and review on multiple platforms
• Fully programable "Time lapse" features should be available, that would be a nice one up on C1P
• etc.

I would say that Adobe's mission with tethering should be to  match every tether related feature that Capture One Pro can do,  and do that with the same superior speed of  Capture One too. (The speed issue though is more of a software wide disappointment with LR as compared with C1P though).

Tethering is of CRITICAL IMPORTANCE to commercial photographers, please make it important.

In general, make Lightroom Classic into "Lightroom Pro" — And deliver all the things us pros want, we would happily trade the lame facial recognition, book making, map, and print module for the stuff we actually could use, like better tethering support, SPEED and PERFORMANCE, and an "Output/Processing/Export" module that can be enabled to process out different formats and resolutions at once.

Quite simply, open up Capture One Pro, and use it, then do the same with Lightroom.
The pain points are obvious.
For starters:LR is slower, lacks live view, software powered focus adjustments, and many camera related technical controls that C1P has.
There isn't even a keyboard shortcut for taking a picture while tethered in Lightroom. That's insane. Especially when you consider that  every pro photographer, assistant, or even art director knows ⌘+K (for Capture One)
I would say that Adobe's mission with tethering should be to  match every tether related feature that Capture One Pro can do,  and do that with the same superior speed of Capture One too. (The speed issue though is more of a software wide disappointment with LR as compared with C1P though).

>Are you on latest version 7.2

• Whats your machine configuration like and setup e.g. catalog size, which HD>

After testing On1's new tethered (so I knew I had an option if upgrading failed me), I just did what was supposed to be about a half hour tethered shooting in LR.  Enough shots that if there were going to be problems, there probably would be.

1.  Yes, display of tethered shots is MUCH faster now. I like that.

2. Except that transfer suddenly conks out altogether — 3 times in the shoot. On one instance, I had left everything idle while interrupted by another activity. When I came back, the tethered capture returned one half of a shot (Raw + B&W JPEG), and hung indefinitely on the other half. I finally killed the process. On another occasion, it hung on one of the two halves again, I waited a few minutes, then chose to stop tethered capture. This time it told me that an image wouldn't be transferred if I quit. I quit anyway, and that's when the image in fact showed up.  On the 3rd occasion, I was about to quit anyway. I waited, again for a few minutes while I picked up all around the shoot, and it suddenly popped in.

Dunno what to say about that, but the hang hasn't happened (yet) with On1's tethered capture. I'll have to do a closer comparison to say whether LR is faster or not than On1.

I'm still shooting to a portable drive that's plugged in (no WiFi), but was shooting to that with On1 as well. Since I will probably only use LR Classic on the laptop from now on, and go with LR CC on my other computer for use with LR Mobile, I might go ahead and create a catalog on the laptop just for tethered and see if that doesn't make a difference.

But faster? When it doesn't hang, it's pretty much instantaneous from my D750—not the largest files, I know. But both JPEG and RAW show up right away. No one would be embarrassed in front of a client at this speed.

And to spin off of what I've said before. I'm a big advocated of Lightroom still, onset, but it's becoming harder. The most crucial thing to photographers is that they look good onset. Capture One is currently the only software that can almost guarantee this. I'll sometimes say that Capture One is best for onset, but Lightroom is best for file management, organization and portfolio evolution, but Capture One is edging into competing for image adjustments (some people will argue they have surpassed LR... I don't think quite yet, but very very close). 
But not many people are going to manage two different image workflows, and they will probably choose their primary piece of software based on the most crucial aspect... looking good in front of the client. They'll put up with Capture One's shortfalls in their own time with image management, but they won't risk looking like an amateur on set... and this is almost entirely based on one unreliable, weakly featured tool: tethering. Fix tethering and you'll instantly be back in competition with C1.

I've never personally used Lightroom for a two camera setup, but if you're asking if this is a use-case that should be considered I can say that this is definitely the case. I've been in many scenarios in many shooting environments where reliability in this use would be helpful.