A binoculars to watch sky

[gak8nxpsli]

I have about 200 to buy a binoculars and I prefer 10X50. Then I find this, Opticron Discovery WP PC 10x50. I need to know the exit pupil but I can't find it.

 

Can you help me with this and do you think this one worth the price? 

 

[Astro_noob]

Exit pupil is simply the Objective divided by the magnification so for a 10x50

Exit pupil = Objective (50mm)/magnification(10x)   

50/10=5

Exit pupil is 5mm. Normaly an exit pupil of between 5 and 6mm is perfect for UK skies anything bigger i.e. 7mm will let in more light than the eye can capture resulting in washed out skies. Anything smaller that 4-5mm will not provide enough light to see the really dim deep space objects.

[gak8nxpsli]

Exit pupil is simply the Objective divided by the magnification so for a 10x50

Exit pupil = Objective (50mm)/magnification(10x)   

50/10=5

Exit pupil is 5mm. Normaly an exit pupil of between 5 and 6mm is perfect for UK skies anything bigger i.e. 7mm will let in more light than the eye can capture resulting in washed out skies. Anything smaller that 4-5mm will not provide enough light to see the really dim deep space objects.

Thank you very much!