Young or old all would agree that it is impossible to bird watch with out a pair of binoculars. More recently binoculars have been used for astronomical viewing.
This Leupold 10x50mm tactical binoculars is waterproof and fogproof. Many binoculars have eyepieces that fold in and out. Binoculars come in the convenient hand-held sizes which make them very easy to take with you wherever you go.
The fog proof models have interior optical surfaces that won't fog due to rapid temperature changes or humidity. Many of the binoculars come with a carry case that can attach to a belt. Viewers can use a pair of binoculars for bird watching, star gazing, observing far off animals, spotting ships at sea, watching a concert, or enjoying a sports game from a nosebleed seat.
If you are still in your twenties you can probably use all of that 7mm exit pupil above as your pupils will dilate to about that size in very dark conditions, however as you get older your pupil does not dilate more than about 4 to 5 mm so large exit pupils are wasted. I tell most of my friends that they can get their Binoculars online now, however, one way I have found that helps is to contact the seller if you need more information.