Binoculars & Monoculars
Binoculars & Monoculars
Choosing the right binoculars or monoculars can feel overwhelming—there are hundreds of options across wildly different price points and use cases. At Sirius Optics, our team of astronomers and nature lovers are here to cut through the confusion and help you find the perfect pair for your needs and budget.
Not sure where to start? Visit our Brisbane showroom, try a few pairs side by side, or give us a call. And if you buy online and the binoculars aren't quite right, we offer a 30-day return policy for store credit.
Understanding Binocular Specs: What Do the Numbers Mean?
You'll see binoculars described with numbers like 8x42, 10x50, or 10-30x50. Here's what they mean:
- The first number is the magnification. An 8x42 binocular magnifies 8 times; a 10-30x50 is a zoom binocular ranging from 10x to 30x.
- The second number is the diameter of the front (objective) lens in millimetres. A larger objective lens gathers more light, giving you a brighter image — especially useful in low light conditions like dawn, dusk, or stargazing.
The trade-off: larger lenses mean larger, heavier binoculars. For handheld use, 42mm is a popular sweet spot between brightness and portability.
What Else Should You Consider?
Beyond magnification and lens size, a few other features are worth knowing:
- Waterproofing & fogproofing
Most modern binoculars are sealed against moisture and nitrogen-purged to prevent internal fogging, making them suitable for outdoor use in all conditions.
- Size & weight
Binoculars with 50mm+ objective lenses can become tiring to hold for extended periods. If you plan to use them for birdwatching or hiking, compact or mid-size models are often more comfortable.
- Specialist features
Marine binoculars may include built-in compasses and floating designs; astronomy binoculars prioritise large apertures for maximum light gathering; image-stabilised models reduce shake at higher magnifications.
What About Monoculars?
Think of a monocular as a compact, single-eye alternative to binoculars — lighter, more pocketable, and surprisingly capable. Some people call them "half a binocular", but there's nothing half-hearted about them. Modern monoculars can include night vision technology, smartphone adapters, and even automatic bird and wildlife identification — making them a versatile choice for travellers, hikers, and wildlife enthusiasts.
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AUD $249.00In Stock
- 15x magnification porro prism binocular
- Large 70 mm objective lens offers maximum image brightness in low-light and long-range conditions
- Ultra sharp focus across the field of view
- Multi-Coated optics for sharp, clear views
- Suitable for terrestrial or astronomical viewing
- Protective rubber covering for ultra-firm grip
- Large center focus knob for easy focusing
- Tripod adapter included
- Long eye relief ideal for eyeglass wearers
- Carrying case included for travel and safe storage
- Limited Lifetime Warranty provides best protection and product support on the market
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AUD $99.00In Stock
SAXON 8-24X40 SCOUTER MONOCULAR
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AUD $199.00In Stock
The saxon 7x50 Focus Free Oceanfront Binoculars are a great multi-purpose pair of binoculars to use on land and at sea.
Waterproof and fogproof, this 7x magnification binoculars comes with quality BaK-4 prisms and multi-coated optics to give amazing views.
Suitable for users of all levels - use them on the boat, on the beach, or for birdwatching - the choices are endless!
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AUD $649.99In Stock
- ED objective lenses provide superior images virtually free of chromatic aberration with accurate color reproduction, increased resolution and contrast
- Fully multi-coated optics for maximum light transmission through the optical path
- Phase and dielectric coated BaK-4 prisms for vivid, true-to-life colors
- Wide field of view and 8.2' close focus
- Tripod adaptable
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AUD $3,885.00In Stock
With 10 X magnification, the NL Pure Green 10 x 32 binocular brings you closer to the action.
These binoculars are perfect for open forest and open field environments.
NOTE: FRP Forehead Rest is NOT included. This is separate item.
Phils Review: "I have found these binoculars to be perfect for open forest and other open areas such as paddocks and lightly timbered pastures or open grasslands. The 32 mm size is perfect for those that may want the 10 x performance but a little lighter quality bino."
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AUD $3,815.00In Stock
With 8 X magnification, the NL Pure Green 8 x 32 binocular brings you closer to the action.
These binoculars are perfect for bird watching in close cover such as rainforest.
NOTE: Does not come with headrest. Headrest is an optional extra.
Phils Review: "If you are looking for the a light high end binocular to look at birds or wildlife in close cover or heavy rainforest then this is the pair for you. The optics really pull out the detail of the birds in the trees."
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AUD $1,280.00In Stock
Big on quality – small in size: The CL Pocket is a folding compact binocular with exceptional optical quality. It offers maximum viewing comfort, even for long periods, and fits perfectly in your hand.
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AUD $4,545.00In Stock
NL Pure - the revolutionary binoculars with the largest field of view to date and barely perceptible edges, without compromising on ergonomics and handling. In other words: Best optics, packed in the smallest possible size. The NL Pure thus provides unprecedented nature experiences.
NOTE: FRP Forehead Rest is NOT included. This is a separate item.
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AUD $4,400.00In Stock
NL Pure - the revolutionary binoculars with the largest field of view to date and barely perceptible edges, without compromising on ergonomics and handling. In other words: Best optics, packed in the smallest possible size. The NL Pure thus provides unprecedented nature experiences.
Phils Review : "Without a doubt the NL Pure 8 x 42 binos are the best binoculars I have personally used. The optics are pin sharp, crisp, and the colour is brilliant. For birdwatching, if you want the best binos in the world then this Austrian made binocular is the business."
NOTE: FRP Forehead Rest is NOT included. This is a separate item.
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AUD $49.99In Stock
- High quality binoculars at an affordable / economical price
- Multi-coated optics increase light transmission resulting in brighter and sharper images with high contrast levels
- Stylish rubber covered aluminum body protects from rough handling
- Ergonomic thumb indents and finger ridges for extra non-slip comfort and ease of use
- Water resistant
- Soft carrying case
- Binocular straps
Why buy from Sirius Optics
Queensland's largest telescope showroom and warehouse
Run by astronomers and nature lovers, not sales people
Expert advice and lessons
Secure checkout with multiple payment options
30 day returns (T&Cs apply)
