Diana 3-9×40 AO Rifle Scope

A versatile variable-power optic designed for airguns and small-caliber firearms, the Diana 3-9×40 AO combines reliable magnification with adjustable parallax correction for sharper focus at different distances. Its classic Duplex reticle, rugged construction, and clear optics make it a practical choice for hunting, target practice, and general field use.

⭐ Key Features

• Variable Magnification (3×–9×): Lets you zoom from close-range to mid-range targets with smooth transition and easy visibility.

• 40 mm Objective Lens: Provides a good balance of light gathering and overall brightness for varied daylight conditions.

• Adjustable Objective (AO): Front-mounted focus ring helps reduce parallax error and maintain a crisp image from nearer distances to infinity.

• Duplex Reticle: Traditional crosshair reticle style for intuitive aiming without clutter.

• Durable Construction: One-piece tube design with corrosion-resistant finish and sealed, nitrogen-filled internals to minimize fogging under changing weather.

• Mount Compatibility: Designed to fit 11 mm dovetail rails, common on many air rifles, with mounting rings typically included.

📊 Technical Specifications

📌 Usage & Performance

The Diana 3-9×40 AO scope is engineered for shooters who want flexibility and clarity across a range of shooting situations. Its adjustable magnification allows you to zoom in for precision and zoom out for wider field coverage, while the adjustable objective helps keep targets in sharp focus even at closer distances — a useful trait for airguns and pellet rifles.

The Duplex reticle gives a clean aiming reference without distracting markers, and its robust design with nitrogen purging helps guard against internal fogging for consistent viewing in varied weather. This makes it a functional optic for:
✔ Hunting small game and pest control
✔ Air rifle plinking and target practice
✔ General field observation and ranges
✔ Daytime shooting conditions

📦 What’s Typically Included

• Diana 3-9×40 AO Rifle Scope

• Mounting rings for 11 mm dovetail rails

• Lens caps / dust covers

• Installation tool (e.g., Allen key) (Accessories may vary by retailer.)

⚠️ Installation & Notes

• Ensure the scope is mounted securely on an 11 mm dovetail rail for reliable stability and performance.

• Parallax adjustment improves focus at varied distances; start shooting with lower magnification and then zoom in as needed for fine sighting.

• This optic performs best in daylight to good lighting conditions given its 40 mm objective lens size.