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 $599.99In Stock
- Large 80 mm objective lenses for excellent light gathering in low light conditions or for astronomical observing
- Detachable RSR rail for attaching an optional red dot finderscope
- Rubber armored for improved ergonomics and protection from every day use in the field
- Waterproof and nitrogen purged for use in all weather conditions
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AUD $624.99In Stock
- Celestron’s legendary SkyMaster binoculars get an upgrade with ED objective lenses for superior images virtually free of chromatic aberration with lifelike color, increased resolution, and improved contrast
- Large, 70mm objective lenses offer excellent light-gathering ability—perfect for astronomy
- Threaded eyepieces accept all standard 1.25” astronomical eyepiece filters to bring out details or reduce the effects of light pollution
- BaK-4 prisms and fully multi-coated optics with XLT coatings boost light transmission through the optical path for brighter, more detailed images
- The widely spaced objective lenses of the Porro prism optical design provide an enhanced 3-D view
- Eyeglass-friendly with generous eye relief and padded twist-up eyecups
- Durable rubber-armored housing with improved ergonomics for comfortable use in the field
- Tripod-adaptable for extended viewing sessions
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AUD $999.00In Stock
- 25x magnification porro prism binocular
- Giant 100 mm objective lens offers maximum image brightness in low-light and long-range conditions
- Ultra sharp focus across the field of view
- Individual Eyepiece Focus to ensure optimal focus position
- Multi-Coated optics for sharp, clear views
- Suitable for long-range terrestrial or astronomical viewing
- Protective rubber covering for ultra-firm grip
- Integrated tripod adapter rod for ultra-stable tripod mounting
- Long eye relief ideal for eyeglass wearers
- Deluxe padded 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 $449.00In Stock
- 20x magnification porro prism binocular
- Giant 80 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
- Integrated tripod adapter rod for ultra-stable tripod mounting
- Long eye relief ideal for eyeglass wearers
- Soft 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 $269.00In Stock
- 25x 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
- 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 $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 $274.99In Stock
- Designed with the outdoor enthusiast in mind, waterproof and fully rubber armored.
- Phase coated BaK-4 prisms for increased contrast and resolution.
- Fully multi-coated optics provide brighter images by increasing light transmission through the entire optical path.
- Close focus of 6.5 feet for viewing nearby subjects.
- Sturdy, twist-up eyecups with multiple stops. Eyeglass friendly with 17.5 mm of eye relief.
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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 $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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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)
