Mass Audubon Shop – Optics

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We carry a fine selection of compact and full-sized binoculars, scopes, tripods, and accessories. The Mass Audubon Shop is an authorized dealer for Nikon, Pentax, Zeiss, Opticron, Kowa, and Swarovski.

We offer special optics discounts to Mass Audubon members!

Buyer's Guide to Binoculars

The right optics can bring the beauty of the natural world closer—but it's very important to find the ones that work best for you! Read on for explanations of the different features you should consider when selecting binoculars.


Each pair of binoculars is marked with a set of numbers such as "8 x 42," which refers to the magnification (8) of the binoculars and the diameter of the objective lens (42). The magnification used by most birders is usually between 7 and 10, but don't make the mistake of thinking bigger is better. A smaller magnification usually means you can see a wider area, and it is easier to keep the image steady. With larger magnification, you can see more detail. If you are inexperienced in using binoculars, it is often best to go with a smaller magnification.


The second number in the formula on binoculars (i.e., the "42" in 8 x 42) refers to the diameter of the objective lens. The higher this number, the more light can enter the binoculars, and, theoretically, the brighter the image should be.

There is another element, however, that affects the brightness of the image, and that is coating on the lenses. Every time light hits a glass surface, such as a lens or prism, it reflects away (and loses) some of the light. Since binoculars have many glass surfaces, this loss can be significant. Lens coatings eliminate much of the light lost by reflecting off uncoated surfaces. "Fully-coated" means that all the glass surfaces are coated. Multiple coatings reduce light loss even more, so "fully multi-coated" is even better.

Eye Relief

If you use eyeglasses when you look through binoculars, this may be one of the most important issues you consider. With a short eye relief (under 15 mm), it can feel like staring down a drain pipe, so be sure to select binoculars with over 15 mm of eye relief.

Field of View

This measurement tells you how wide an area you can see through your binoculars. The more you can see, the easier it is to follow a fast flying bird, or catch movement to the side. This is measured either in degrees or in feet per thousand yards. Look for a minimum of 6 degrees, or 300 feet at 1,000 yards.

Finding the Best Fit

The most important feature in choosing binoculars is finding a pair that feel right to you. Pick them up, and hold them, and notice how they feel. If your eyes are close together, do they fold down enough for your eyes?

Focus on the closest object you can. Is this distance going to be close enough for you? For example, if you are going to look at butterflies as well as birds, a close-focus of 15 feet may be much too far away.

Play with the focus knob, and decide if this is a natural movement for you. Is it easy to locate and focus on an item in the distance, or is the focus finicky? Binoculars an an investment that you can enjoy for a lifetime, so be sure you are comfortable with them.

Ways to Purchase

  • In Person: Visit our store in Lincoln to try out our selection! Our knowledgeable sales staff are always on hand and eager to help you find the optics that are just right for you. 
  • By Phone: You can also place your by calling 781-259-2214.

Not sure which binocular or scope is right for you? Just call 781-259-2214 or email us and a salesperson will be happy to answer questions and provide prices and product information. Or check out our Buyer's Guide below!

Sampling of Optics We Carry

Kowa 883A Scope
Zeiss Victory 8x20  Kowa 883A Scope with 20-60 Zoom
Swarovski EL Swarovision Swarovski ATS & STS Spotting Scopes
Nikon Monarch M5 8x42
Zeiss Victory SF Binoculars
Nikon Monarch M5 8x42 Zeiss Victory SF
Mass Audubon Binoculars Harness
Nikon Prostaff Compact 8x25 Binocular Harness w/ Mass Audubon Logo