Not the slightest idea !
But again, that‘s me talking, with an IPD of 61mm.
People with wide IPDs may be happy with them.
On the other hand, all those observing wearing their glasses may also not like the folded down eyecups, since eye relief is not huge and the folded down eyecups prevent you from having your glasses touch the eyelenses, so you most likely lose some FOV.
The solution may be to exchange the regular eyecups with other ones that fit; a winged design might be ideal.
The Nikon Stabileyes are 12x32 and 16x32. Also 14x40.
So exit pupil is 2.0mm to ~2.8mm.
I have never tried them.
Fujinon exit pupils are also small.
I have had no problems with Canon 18x50 IS.
Hi,
Here is an interesting history and explaination of the VAP vs the Lens Shift methods of producing IS.
There’s also the purely mechanical Zeiss 20x60 S. Not sure what optical principle they use for the stabilization.
The Zeiss 20x60 S has magnetic damping, springs and counterweights (which may be the prisms?).
What I don't know is how many years the magnet lasts.
The warranty used to be 5 years.
It is I think the best hand held binocular one can buy. But one needs to be strong.
It is cumbersome and the button needs to be held down.
Basically one needs to hold it in one hand to support it and press the button with the other.
Optically, centrally, it is I think unrivalled in a hand held binocular. The only better binocular might be the Takahashi 22x 60, but this is really a binocular telescope, I think heavier and narrow field.
V
The field is heavily curved, but optically it is near astro performance.
It is quite an old design, possibly inspired by horse racing needs for the far side of the track.
It was maybe designed by the same person who designed the Zeiss 15x60.
It featured in a CSI episode as the main clue.