Optics and personal preference seem to be the foremost, but here is a list of issues you should consider. Are you planning to buy night vision binoculars?
Most places specializing in Binoculars cover birding and hunting and astronomy which are too powerful for the marine environment. Hunting binoculars should feature some sort of rubberized exterior armoring to protect them from being damaged if dropped or bumped against trees, brush, rocks and so on. When choosing a night binocular first decide what you are going to use it for.
So a pair of binoculars that has the number 7x30 stamped onto the casing is a binocular that will magnify any object to seven times its actual size, and has a lens size of 30mm. Choosing a telescope is not an easy choice to make and is one that really needs research. In order to define the quality performance of their products, binocular makers present the field of view in mathematical conversions that show a variance of fields.
There are models available that allow you to do more than just look. You can use your binoculars or telescope after the kids go to bed to look at the night sky with your sweetie!
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