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 $3,089.00In Stock
When speed is paramount, there’s no substitute for a range-finding binocular. The BX-4 Range HD TBR®/W 10x42mm fuses our DNA® engine and ballistics software with the optical performance diehard hunters and shooters demand.
Learn More -
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AUD $129.99In Stock
- Multi-Coated Optics
- Waterproof and Fogproof
- Protective Rubber Covering
- Twist-up Eyecups for Quick Adjustment
- Moisture Resistant Neoprene Carrying Case
- Limited Lifetime Warranty
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AUD $119.99In Stock
- Multi-Coated Optics
- Waterproof and Fogproof
- Protective Rubber Covering
- Twist-up Eyecups for Quick Adjustment
- Moisture Resistant Neoprene Carrying Case
- Limited Lifetime Warranty
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AUD $799.99In 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, 80mm 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 $374.99In 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, 50mm 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 $194.99In Stock
- 12x magnification porro prism binocular
- Large 60 mm objective lens offers maximum image brightness in low-light conditions
- 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 adaptable (adapter sold separately)
- 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 $114.99In Stock
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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 $624.99In 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 6.5' close focus
- Tripod adaptable
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)
