The number following the “x” in the size of a spotting scope stands for the diameter of the objective lens, which typically ranges from 50mm to 80mm in size. The bigger the objective lens, the more light enters the scope and the brighter and clearer the image will be. The size of the lens is especially important in low light conditions.

What are the differences between a large and small objective lens?

• Larger lens = More detail, better image quality at higher magnifications, larger field of view
• Smaller lens = Smaller, more compact scope, lighter weight, more affordable

But the quality of your spotting scope depends on more than just the size of the objective lens. A large lens does not automatically trump a smaller lens. The quality of the objective lens also depends on the quality of the glass used to make the lens. A small objective lens with high performance glass (such as ED, APO, HD, or Fluorite) can deliver a higher quality image than a large objective lens with standard glass.

The higher the magnification, the more important it is to have a high quality objective lens for sharper image quality and detail. At lower magnifications, a smaller and more affordable objective lens should suit your needs just fine.

The quality of the objective lens can also be improved by special coatings added to the glass. For example, the anti-glare lens coating used on the KillZone scope reduces distortion and focuses the light rays for a crisper, brighter image. Special coatings ensure a quality image in less-than-ideal light conditions. Keep in mind that the use of high performance glass and lens coatings will increase the cost of the spotting scope.

Spotting scopes are perfect for scouting game, watching wildlife, and seeing objects at greater distances than binoculars will allow. Using a scope is a bit different than using a pair of binoculars, however. Here are a few tips to help you figure out how to use your spotting scope.

1. Choose a good spotting location where you can get a good view of your surroundings. Make sure the view is unobstructed in the direction you will be looking.
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2. Set up the tripod and scope on as level ground as possible. Adjust the tripod legs as needed. The use of a tripod is necessary because of the high magnification settings of a scope. Binoculars you can hold steady in your hand, but with the higher magnification power of a scope, you will need a stable base (tripod) in order to view a steady, focused image through the eyepiece. With a spotting scope, even small movements (such as the barely noticeable shakiness in your hands) will cause you to lose the focus on your target.
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3. Adjust the magnification power to the power you need. Generally, you want to start at the lowest power setting to locate your target and then increase the magnification as needed. The lower the magnification setting, the larger your field of view will be.
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4. Locate your target through the scope. Use binoculars to help you find your target, if needed. Once you have zeroed in on your target, make any fine tune adjustments to the scope to see the image clearly and at the correct magnification.
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5. Rest your eyes often. Looking through the eyepiece of the scope for long periods of time can quickly tire out your eyes. Take regular breaks from looking through the scope to give your eyes a rest.