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Some further ideas including some you have covered.

Does the camera charge from the problematic M4 Macbook ?

https://discovercameras.com/nikon-camera-usb-not-working/

You could dig into the macbook hardware listings for the TB/USB ports and see if there is a difference between the two M4 machines, either port daughter board or main board ports as well as exact OS build and port driver version numbers.

Which machine was the 810 first connected to ?
Maybe the camera is remembering the first connection only and has to be reset in its menu somewhere ?
i looked on Nikon's website but that model does not seem to be supported by software any more. The old software was available by disk.
Do you have another machine you can test against, Mac or Windows  ?

Thank you.

1. First tried tethered shooting on my MBP.

2. A quick internet/AI search of In the nikon d810 camera, are there any menu items related to tethered shooting? gave the answer No, there are no specific menu items or toggles labeled "tethering" or "tethered shooting" inside the Nikon D810 internal menu system.But note, this was from a source I’m not familiar with. Furthermore, most of the hits for my question were from several years ago, so their value for today’s situation is not clear to me. And finally, neither my D810 owner’s manual nor another D810 user book has an index entry for “tethered shooting.”

3. Yes, I do have my previous MBP. It’s has an older OS and version of Lightroom Classic than my current MBP, and the Lr version does include tethered shooting. However, I don’t own a USB-A male to USB-C female cable, which I need in order to connect it to the D810 using the same cable I've been using all along. I have ordered the cable and it’s supposed to be delivered tomorrow.

Depends, what accessories did you buy with that tariff dividend last year?

Oh, I must have misplaced that payment .

Meanwhile, along with the Supreme Court pissing off the baby president:
Kennedy Center board votes to close for renovations; judge blocks Trump name returning to building
PUBLISHED TUE, SEP 15 2026

What camera accessories should I buy with my $5000? 

Depends, what accessories did you buy with that tariff dividend last year? Maybe buy one of those 10 year old point and shoots that are so hot lately.

As soon as the mid-terms are over, war with Iran will come to end, gasoline prices will come down, and Canada and Greenland (and maybe Iceland) will come to their senses and join the US. Meanwhile, there is an online petition here in Canada to have the US ambassador to Canada recalled. Ever since which he has had to decency to keep his gob shut.

Wasn't it interesting how the Putin's chief financier was invited to some international meeting just around the time that Putin pledged his support for Iran. You'd think that Russia's support for Iran would give Trump pause.

Printing without color management in i1Profile works and matches the last OS.
Printing with color management in Photoshop 2026 using the same profile in the last and newest OS match.
It seems this new OS works fine with the Epson P800 and 900 with color management.
EDIT: The ColorSync Utility correctly prints without color management in macOS 27 as it did in the past (Print as Target).

Which machine was the 810 first connected to ?
Maybe the camera is remembering the first connection only and has to be reset in its menu somewhere ?
i looked on Nikon's website but that model does not seem to be supported by software any more. The old software was available by disk.
Do you have another machine you can test against, Mac or Windows  ?

what hardware version is your MB ?
did you try other USB/TB ports on her MBP4 ?
turn off camera, connect to MBP, turn on camera. Any difference ?

Thank you.

1. Both MBs are M4 MacBook Pro, OS Tahoe 26.5,  Lightroom Classic 15.0
2. Yes. The ports are ok (tested with another external drive, which connected).
3. No difference. The D810 still doesn’t connect to my wife’s MBP, but with the same steps it connects to mine.

It seems to me that that the solution resides either somewhere in Lightroom (i.e., perhaps as set up on her MBP in a way that is different from how it is set up on mine) or elsewhere in the computer. Lightroom otherwise works fine in the ways my wife uses it.

Most of us wait to update Mac OS's until at least the 0.3 version. Let others be the guinea pigs.

I've been using Mac's since 1984, yes 1984 and it's been a rare update that made my life better.

I do the security updates though I've not had virus issues.

No Canon specific knowledge as I'm an Epson printer person but all printers are challenging on a good day.

what hardware version is your MB ?
did you try other USB/TB ports on her MBP4 ?
turn off camera, connect to MBP, turn on camera. Any difference ?

F/stop selection is limitied to only one lens, 24mm equivalent. And it is not like you can go to, say, f/22... just f/4

Even there, diffraction might become a problem worse than any advantage of perceived increase in depth of field.

It could be a psychological diaphragm, where you elect to change aperture, but nothing actually happens, and with so much dof already there, you only fool yourself… okay, Apple, that’s a cynical joke! Reading various reviews, it would appear that other marques have already gone the adjustable apertures route, only to drop it a short while later. How much micro complexity does anybody need?