I am talking of hand held binoculars costing £15,000 plus.
Hand made.
Perfection is an idea, a concept of the mind.
Perfection does not exist and certainly not for binoculars.
1. A hypothetical perfect binocular for one person would not be perfect for another.
2. Collimation is not perfect.
3. The image from a fast system as in a binocular is not perfect, especially as it covers object distancse from near to infinity.
4. It has an erecting system.
5. The eyepieces may be wider than a person's IPD.
To achieve perfection, one has to make compromises and accept that the binocular is perfect enough, even though not actually perfect.
I have not seen even a near perfect binocular.
The Zeiss 20x60S is near perfect on axis, but not off axis, and the AFOV is not large.
The Nikon WX may be nearly perfect but is too large and heavy.
I have seen and owned near perfect telescopes.
I suppose that they had faults, but were not noticed in use.
Horace Dall's camera obscura and 8 inch Maksutov seemed perfect to me.
My Pentax 100mm f/12 astro refractor, 100mm Soviet Maksutov and Ross 100mm triplet seemed perfect to me.
The Hubble space telescope when corrected seemed perfect.
Then the Webb telescope came along.
There are seemingly perfect objects.
The wheel.
A paper clip.
Maybe a pencil.
But they also have faults.
As to the unaided view in humans or animals.
This is very far from perfect even in the best examples.
There are £80,000 military binoculars, but these too are not perfect.
Some folks on the forum seem continually looking for the perfect binocular.
Good luck in your quest.
Regards,
B.