[sheeny (Al)]

G'Day Markus.


What you're looking for I'd hardly call ultra wide especially when it comes to binoculars.


For light grasp you need the biggest objective you can afford. A full dark adapted eye is 7mm diameter pupil (when young!), so 49mm2.


35mm binos will capture 25x more light than your naked eye.
50mm binos will capture 51x more light than your naked eye.
80mm binos will capture 130x more light than your naked eye.
100mm binos will capture 204x more light than your naked eye.



You also want the largest usable exit pupil you can get. there's no point having an exit pupil bigger than the pupil of your dark adjusted eye, so choose binos with an exit pupil as close to 7mm as possible - better under than over.


Obviously you want the biggest field of view you can get once these 2 criteria are met.


My Pentax 7x50s have an exit pupil of 7mm and a field of view of 7.1°. They are excellent to hand hold.


My AOE 20x80s have an exit pupil of 4mm and a FOV of 3.4°. While they can be handheld, they are much better on a tripod. 11 x 80's would be better for what you want if you want to go this big. They would have an exit pupil of 7.3mm.


Al.