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Look for generation 3.
Welllll, I doubt you found a “30×50″ night vision binocular. Most of them only provide three or four power magnification.
Try http://www.midwayusa.com
They sell several different types of night vision stuff. They range in price from about $250.00 to about $4,000.00
1st Generation is the cheapest and 3rd is highest. Keep in mind that 1st generation stuff is technology dating back over 20 years.
If you are just looking for something to play around with, buy a good flashlight. If you really need serious night vision, spend the big bucks. . .
30×50 if I’m not mistaken refers to the magnification of a particular telescope, not its actual night vision capabilities.
30X means 30 times magnification of an object, thats some pretty big binoculars for night vision, you sure its not 3X50?
Anything between 3x to 5x is pretty good for night vision binoculars.
The higher the generation (it starts from 1 all the way to 4) the more better the and more advanced the seeing quality and expensive they get. Generation 1 for most normal civilian purposes is good enough. Generation 3 is mainly for military type use.
As the contributors have mentioned-the least expensive are the older generation one models. And are adequate for individuals wanting an inexpensive type for casual night viewing.
As for as specifications?
Here is a link you can view. One of numerous ones available. Just search for night vision.
And you may want to check your sourse for the 30×50 you mentioned. Seems that could be wrong.
Do you mean night vision or binoculars for viewing stars? I have an idea you might mean the latter. 30×50 have extreme magnification and would not be suitable for a hand held pair of binoculars–too much jiggle. 10 power is about the max for hand held unless they are image stablized. More than 10 power, you will need a tripod to stabilize them. For anstronomical viewing the larger the objective lense, the more light they will gather–the 2nd number. 50 refers to 50 milimeters which is the diameter of the objective lens–the lens in front. But the larger the objective lense the heavier they become, which can be a problem. 7×50 binoculars have been a favorite for night viewing for many years. There are available 9×63 binoculars manufactured by Mead. Giant objective lense to gather a lot of light. They weigh 44 oz though.