How does the 2.5-20x50 magnification and side parallax handle close-up pest control in dense Australian scrub?

The GPO Spectra features a side focus parallax that adjusts from 10 metres to infinity, allowing you to focus sharply even on close-range targets down to 10 m. While its 8x zoom transitions seamlessly from a wide 2.5x tracking view up to 20x for precision, keep in mind that for ultra-fast driven game inside 10 metres, dedicated low-power variable optics or reflex sights remain better suited.

What battery does the iCONTROL illumination use, and does this riflescope require any Australian electrical compliance certifications?

The iCONTROL illumination system is powered by a single replaceable CR2032 3V coin cell battery featuring an auto-shutoff after 3 hours and a low battery alert. Because this riflescope is entirely self-powered by a button cell and does not connect to 240V mains electricity, Australian SAA and RCM high-voltage safety certifications are not applicable.

Will the 718 g weight and 30 mm tube handle heavy magnum calibres during extended outback deer stalking?

Built on a single-piece 30 mm aluminium tube with an internal shockproof design, the RSX840 is engineered to reliably withstand heavy magnum rifle recoil such as .300 Win Mag and .338 Lapua. At 718 g, it strikes a stable balance for vehicle spotlighting and general bush stalking, though hunters prioritizing ultra-lightweight mountain setups under 500 g typically opt for a lighter 1-inch configuration.

What optional accessories from the GPO range pair best with this 50mm objective model for field use?

To manage glare during harsh outback daylight conditions, you can pair the 50 mm objective lens with the GPO A351 50mm sunshade. Additionally, for long-range glassing sessions when scanning open terrain for pests or deer, the GPO A10008 Bino Harness Pro and GPO A410 Carbon Fibre Tripod with Ball Head make ideal companion gear.

Hunting Riflescope - GPO RSX840 Spectra

The GPO SPECTRA 8x 2.5-20x50i is a variable-power hunting riflescope designed for target identification and precision shot placement across changing distances. Featuring an 8x super-zoom ratio, it transitions from a 15.5 m field of view at 2.5x magnification to detailed extended-range observation at 20x magnification. Built around a 30 mm one-piece aluminium tube with a 50 mm DoubleHD objective lens, it delivers 87% light transmission utilizing GPObright multi-coatings for low-light dawn and dusk conditions. Point of impact is controlled via PASSIONtrac zero-resettable capped turrets with 0.1 MRAD click adjustments across approximately 26 MRAD of total elevation and windage travel.

Key Features

8x Super-Zoom Ratio: Covers 2.5x to 20x magnification to support close-range target tracking and long-range identification.
DoubleHD Low-Light Glass: 50 mm objective assembly delivers 87% light transmission enhanced by GPObright multi-coatings and PASSIONdrop hydrophobic exterior protection.
iCONTROL Illumination: Features a Second Focal Plane (SFP) G4i reticle with a stepless, continuously adjustable red microdot powered by a CR2032 battery with a 3-hour auto-shutoff.
Wide Parallax Range: Side-focus parallax adjustment corrects focus from 10 m to infinity.
Durable Construction: Single-piece 30 mm main tube is gas-purged for waterproof and fogproof performance, built to handle magnum rifle recoil.

Technical Specifications

Magnification: 2.5x – 20x
Objective Lens Diameter: 50 mm
Main Tube Diameter: 30 mm
Reticle: G4i illuminated microdot (Second Focal Plane)
Click Value: 0.1 MRAD (1 cm at 100 m)
Total Adjustment Travel: ~26 MRAD (elevation and windage)
Field of View: 15.5 m – 1.9 m at 100 m
Eye Relief: 90 mm
Exit Pupil: 9.0 mm (at 2.5x) to 2.5 mm (at 20x)
Parallax Adjustment: 10 m to infinity (side focus)
Length: 357 mm
Weight: 718 g
Power Source: 1 × CR2032 coin cell

Who is the GPO Spectra 8x 2.5-20x50 G4i for?

Australian deer stalkers — navigates tight scrub and open clearings with this riflescope using an 8x zoom range spanning 2.5x to 20x magnification alongside a 50 mm objective lens for low-light dawn and dusk glassing.
Pest controllers — leverages the 10 m to infinity side-focus parallax adjustment and 0.1 MRAD turret clicks on this long-range optic for precise shot placement on foxes, wild dogs, and feral pigs.
Precision magnum rifle shooters — utilizes 26 MRAD of internal turret travel housed in a 718 g shockproof 30 mm monotube engineered to withstand heavy centrefire recoil.

Less suitable for: hunters tracking fast driven game inside a 10 m threshold where a dedicated 1-6x or 1-8x low-power variable optic (LPVO) or non-magnified reflex sight is required, or ultra-lightweight mountain hunters where sub-500 g 1-inch scopes provide a lighter carrying profile than this 718 g optic.

SKU	GPO40617LP
Model #	RSX840
Brand	Gpo
Shipping Weight	1.0000kg

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Gpo Rsx840 Spectra 8x Riflescope 2.5-20x50 G4i Reticle

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