What are True Night Binoculars
By Carlo Bland on June 3, 2009
Binoculars are a popular recreational item now. They have their uses in almost any outdoor pursuit. They can add to the pleasure of camping, hiking, hunting and boating as well as being a necessity for bird watching.
You can do most of these activities, in poor light or even in darkness. This makes night vision binoculars an attractive proposition. But they vary widely in price and function and you could easily make a costly mistake.
There is a difference between binoculars that make best use of low light conditions and a true night binocular. For use at dusk or dawn, low light binoculars could be suitable. Let’s look at the concept of Exit Pupil.
This is the diameter of the light beam leaving the eyepieces. Hold the binoculars at a short distance and on each eyepiece, you will see a small circle of light, the exit pupil. On binoculars that are 12×50, you divide 50 by 12 to get just over 4mm diameter for these. A higher figure equals more light, but that is not the only factor.
For true nighttime performance, you need an infrared light source to be able to see when there is no natural light. The effective range of these varies, so buy what you need. For hunting, a range of 10 yards is useless.
There are different optical devices for different uses. A monocular looks like a telescope and is sometimes called a spotting scope. This is a clue to its use. It is OK for a quick sweep of the terrain to find your friends or a path.
A compromise is a bi-ocular, with two eyepieces but only one front lens. A true night binocular, with two lenses, allows your eyes to be adjusted equally to the night vision viewfinder. This is preferable for extended periods of use.
So, before setting out to purchase night vision binoculars, consider in what light conditions you will be using them and whether you will be using them for sustained periods. A true night vision binocular can set you back several hundred dollars and may be a waste of your money if they are more than you really need.
Bookmark/Share this Post by:
Readers Comments
Business »
How To Deal With Printing Company You Want To Work With
February 8, 2010
Printing is a significant part of any business – small or large. With the emergence of numerous printing services vendors it has become more convenient to avail this service, but with so many options you need to exercise care in picking a printing company that fits your needs the best.
Finance »
Private Placement Memorandum: How to Get the Investors You Want, FAST!
February 5, 2010
Entrepreneurs are being turned onto Regulation D in droves. Regulation D Rule 504, 505 and 506 allow companies a more lenient fund raising process than those who choose to go public by other means. In the past year I’ve seen more PPM consultants pop up on the internet than ever before and I have to admit I’m concerned. As a veteran in this field I’ve seen it all, now we have a legion of self proclaimed Reg. D gurus who buy templates, add some text and tell their clients that they are delivering a customized offering memorandum; here’s where things go bad and a difficult situation gets even worse. You have this worthless document, now what?
Health »
Greensboro NC Weight Loss Authority Helps Others Shed Pounds Fast
February 8, 2010
You probably are all too aware how easy it is to put on pounds. If you have also tried out various diets and plans to help lose weight then you will realize just how tough it is to get rid of the excess fat once it’s on the body. For this reason you may be searching for the best Greensboro weight loss program that will work effectively and in as short a time as possible.
Education »
Quick Calculations Could Bail You Out Of Debt
February 8, 2010
With various accounts, debts, interest rates hitting you at once, your financial situation can very well seem intimidating. But if you follow this program you will find that there is an effective and safe way to manage your money.
Investing »
Birla Sun Life Mutual Fund Celebrates 15th Anniversary
January 12, 2010
Birla Sun Life Mutual Fund (BSLMF) is celebrating completion of 15 years & has turned out to be one of the leading Mutual Fund houses in India today. Since its inception, the fund house has registered impressive growth in terms of business (asset under management) and has offered funds to its investors that have created wealth for them consistently.
Currency Trading »
Forex Trading Tips – Do You Understand The Fundamentals?
December 2, 2009
I view fundamentals as a technique of qualitative analysis of economic situations and events that affect a countries currency, it is not easy to master by any means; it deals with a lot of underlying effects and consequences of decisions from the central bank, government and political news, major bank policy changes, major economic events, and world trade news and how this information from different sources may change money market decisions in the forex.
