Firstly they are light ,maybe 4lbs cf. the ultras which are 5lbs.
They are wrapped in a rubber armour, which is WP,and they appear quite low profile cf. the ultras. They would be 0.5" shorter. The centralbar of the steiner is light but very solid, has two adjustment screws & feels like a big improvement over the big heavy metal bar that were on the 20x80 triplets i had. I found the bar on the triplets was prone to movement and did not handle the weight of the bino well. The steiner bar is so good you do not notice any movement - like the bar & bino are one - as it should be
The ep's appear quite recessed, meaning you have to get close - the er would be less than the ultras, maybe 10mm as opposed to 18mm.
The ep glass diameter is also a lot less than the ultras, 3/4" cf 1".
The ep's are less comfortable & the low profile body shape makes it feel a little claustrophobic cf the ultras.
I measured the exit pupil at 4mm cf the ultras at 4.5mm - i will endeavour to check this with more accurate equipment in the next few days.
The front lens have a nice purple coating, with a hint of orange when you alter viewing angle - it is difficult to see down the barrel.
When looking down the barrels the steiner's have smooth insides cf the ultras which have many little graduations.
On closer inspection with a laser pointer - the steiner barrels have a diffuse coating - like they have been sprayed with a fine powder, which diffuses the light and does not let reflection bounce around the ota from the laser. There is also a baffle at the very end before the light path bends.
Comparing the fov in daylight, the ultras are about 4.3deg, i estimate the steiner is 2/3 of this, at about 2.8 deg. The view is slightly restrictive but i am only used to the ultras and the wide views.
The steiner needed re-adjustment of focus when going from far to infinity, whereas the ultra was in focus going the same distance. The IF of the ultra is very stiff, and can move the fluid head when turned -the steiner was very free & easy, i will look for focus slip (didn't notice any) on extended viewing.
The IPD of the ultras is very good, from 56-74mm, the stiener is slightly less at the large end - but should not be a problem for most.
It is cloudy here tonight, but i did manage a look at the moon.
The steiner is slightly fainter, but showed less false colour, it was almost not detected - whereas the ultras showed a hint of green. The view was equally sharp - the ultras surprisingly lost sharpness at the bottom of the field.
Moving the crescent moon in the steiner off-axis revealed a hint of purple - but it was minimal and the ultras suffered the same problem - maybe a fraction worse ( i detected green to yellow mostly)
The image size of the stiener was very pleasing, the extra mag making a big difference.
When the weather clears i will do some star tests side by side.
i will include some pics in the posts below.
edit: sirius appeared for a brief moment - the steiner showed a slightly sharper view of the star - more pinpoint,but it is close
One thng i should mention is the cost - the stienerretails at about 700euros or $1000US & $1350Aus. I paid about half of this for a 5yr old pair. The ultra retails for $350US & $450AUS (the margin is less-direct china import)
For the money Surely Steiner could have included some type of case-even a cheap one - instead it's an optioned extra
Addendum: The binos came with a 128rc manfrotto head - which i must say i am not that pleased with,i did not find the handle to be in a comfortable position, and i think it added to the claustrophobia viewing with the steiner's. I will use my old head in future,which gives a better platform.