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 $319.00Backorder Available
- Lower magnification allows the user to locate a subject more easily and then zoom in for a close-up view
- Multi-coated optics enhances sharpness of detail and crispness of color
- High quality BaK-4 prisms provide higher light transmission for better viewing in low light conditions
- Large objective diameter provides a comfortable viewing aperture at high magnification levels
- Long eye relief for more comfortable for all users; essential for those wearing eyeglasses while viewing
- Diopter adjustment allows for refinement of image to correct for any differences in strength between the users own eyes
- Tripod adapter included to mount the binocular on a tripod for prolonged viewing sessions or simply for increased stability while observing
- Limited Lifetime Warranty
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AUD $449.00Backorder Available
- 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 $999.00Backorder Available
- 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 $499.99Backorder Available
- Large 70 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 $599.99Backorder Available
- 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 $624.99Backorder Available
- 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
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AUD $699.99Backorder Available
- 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
- Tripod adaptable
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AUD $6,540.00Backorder: Contact US for ETA
Swarovski AX Visio 10X32 Binocular
Learn More -
AUD $89.99Backorder Available
- High-quality everyday binoculars that are easy to take along on all life’s adventures
- Large 50mm objective lenses with tremendous light gathering capability
- Multi-coated optics increase light transmission for brighter, sharper images with high contrast
- Rugged and water-resistant rubber covered aluminum body
- Ergonomic finger ridges for a non-slip grip
- Includes a soft carrying case and neck strap
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AUD $59.00Backorder Available
- High quality monocular 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)
