Discovery HT 4-16X40 SF

Discovery HT 4-16X40 SF – High-Precision Riflescope with Side Focus for Hunters and Shooters

The Discovery HT 4-16X40 SF is a high-performance rifle scope designed for hunters, sport shooters, and outdoor enthusiasts who need clarity, reliability, and consistent precision across a wide range of shooting distances. With its 4x to 16x magnification range and 40mm objective lens, this scope delivers both the close-range flexibility and long-range detail needed for versatile field use. The integrated Side Focus (SF) mechanism adds even more accuracy to your shots by correcting parallax from close distances to infinity. Ruggedly built and optically refined, the HT 4-16X40 SF is an ideal scope for shooters who need dependable performance in the field or at the range without overcomplicating their setup.

Key Features of Discovery HT 4-16X40 SF Rifle Scope

1. Versatile 4–16x Zoom Range for Medium to Long-Range Accuracy

The 4x to 16x magnification offers the flexibility needed for different types of shooting scenarios—whether you’re scanning a game trail at 100 yards or targeting distant silhouettes at 400+ meters. At the low end, 4x provides a wider field of view for fast-moving or close-range targets. Crank it up to 16x, and you’ll have the precision needed for long-range accuracy, target identification, and tight groupings. This makes it ideal for hunters, competition shooters, and tactical users who value clear performance across varying distances.

2. Bright and Balanced 40mm Objective Lens for Realistic Imaging

The 40mm objective lens hits the sweet spot between light-gathering ability and compact profile. It provides enough brightness and clarity for early morning hunts and late evening shots, while maintaining a slim and lightweight feel ideal for portable setups. The lens also ensures excellent edge-to-edge sharpness and natural color rendering, giving you a more detailed view of your environment. Whether you’re in shaded forests or open fields, your visuals remain crisp and immersive.

3. Side Focus Parallax Adjustment for Sharper Long-Range Shots

One of the standout features of this scope is its side focus (SF) parallax adjustment. Unlike fixed parallax scopes, this one allows you to fine-tune focus and eliminate aiming errors at any distance, from short-range targets to distant marks. Located conveniently on the side turret, it lets you dial in clarity without shifting your shooting position. This is especially useful when shooting from a benchrest or prone, where maintaining eye alignment is crucial for long-distance accuracy.

4. Fully Multi-Coated Optics for Maximum Light Transmission

All air-to-glass surfaces on the HT 4-16X40 SF are treated with full multi-coatings that enhance light transmission, reduce glare, and improve image contrast. This optical treatment ensures brighter images, especially under low-light conditions like dawn or dusk. You’ll experience less eye fatigue and better target discrimination, even at higher magnifications. These coatings also improve overall durability by protecting lens surfaces from scratches and environmental wear.

5. Durable One-Piece Tube Construction with Weather Protection

The scope body is built from a solid piece of aircraft-grade aluminum, making it resistant to recoil, shock, and tough field conditions. It’s nitrogen-filled and O-ring sealed, providing waterproof and fogproof performance in changing weather. Whether you’re hunting in rainy forests, dusty plains, or dewy early mornings, this scope holds its zero and clarity. Its black matte finish also helps reduce reflections, keeping you concealed in hunting or tactical environments.

6. Precise and Repeatable Turrets with Positive Click Feedback

The scope features low-profile turrets for windage and elevation adjustments, each offering audible and tactile clicks for quick dialing. These turrets make it easy to zero in your rifle and adjust on the fly for wind drift or bullet drop. The clicks are clean and consistent, ensuring you can track your changes without over-correcting. Once zeroed, the scope holds firmly in place, even through extended recoil cycles or repeated handling.

7. Long Eye Relief and Comfortable Eye Box for User Safety

This scope provides generous eye relief, allowing for safe use with high-recoil rifles while also being more forgiving in your shooting position. The wide eye box ensures a quick and easy sight picture without having to fine-tune your eye alignment every time. Whether you’re adjusting for elevation or engaging multiple targets, the consistent eye relief allows for a smoother shooting experience with less fatigue during long sessions.

How to Use the Discovery HT 4‑16×40 SF Scope

1. Securely Mount the Scope on Your Rifle: Choose sturdy 30 mm scope rings compatible with your rifle’s rail (Picatinny or Weaver). Place the scope in the rings, adjust eye relief so you have a full field of view, and ensure the reticle is level. Gradually tighten screws in a crisscross pattern to avoid tube distortion or zero shift during recoil.

2. Begin with 4× Magnification to Locate Your Target: Start at the lowest magnification (4×) to quickly scan the environment. The wider field of view makes it easier to pick out targets at close to mid-range before zooming in for detail.

3. Adjust Side Parallax and Focus for Clarity: Use the side-focus/parallax knob (typically 10 yds–∞) to sharpen the image based on your target distance. Then use the ocular fast-focus ring to crisp up the reticle. This two-step process ensures clarity both on the target and in the aiming reticle.

4. Zoom in Incrementally Up to 16× for Precision: Once the target is centered, gently rotate the magnification ring toward 16×. After each zoom change, tweak the parallax and focus to maintain crisp image quality—essential for accurate mid- to long-range shooting.

5. Use Reticle Illumination if Equipped (Red/Green): If your HT model has an illuminated reticle, use the side control to switch on red or green illumination. Choose a brightness level that enhances reticle visibility without blurring the image—ideal in low-light or dusk conditions.

How to Clean the Discovery HT 4‑16×40 SF Scope

1. Blow Away Loose Dust with a Soft Brush or Blower: Remove grit or dust from both lenses using a lens-cleaning brush or air blower. Avoid wiping directly on dusty lenses to protect coatings from abrasion and scratches.

2. Gently wipe the Lenses with a Microfiber Cloth: Clean the lenses in small, gentle circles using a clean microfiber cloth. Avoid paper products or clothing which can leave micro-abrasions or fibers behind.

3. Apply Lens Cleaner for Smudges and Oil: Dab a bit of lens cleaning solution onto the cloth (never directly on the lens) and softly wipe away stubborn fingerprints or smudges until the glass is clear and streak-free.

4. Wipe Down the Scope Body with a Damp Cloth: Use a softly dampened cloth to clean the aluminum scope tube, turrets, and fast-focus eyepiece. Be careful to avoid moisture near turret threads and lens seals.

5. Allow the Scope to Air-Dry Fully Before Storage: Let the scope dry completely in a clean, dust-free area before putting it in its case. Trapped moisture can lead to internal fogging or corrosion over time.

How to Take Care of the Discovery HT 4‑16×40 SF Scope

1. Store the Scope in a Padded Case When Traveling: Use a padded or hard case for storage or transport, even when mounted. This offers protection against bumps, scratches, and sudden movements that could shift the zero.

2. Avoid Rapid Temperature Changes: Prevent condensation by allowing the scope to equalize when moving from cold to hot environments, such as from an air-conditioned vehicle into warm outdoors.

3. Regularly Remove Battery If Unused for Long Periods: If not using illumination for weeks, remove the CR2032 battery to prevent possible leakage or corrosion within the turret area.

4. Tighten Mounts and Turret Caps Carefully: Ensure mounting screws and turret caps are snug—not overly tight. Excess force can damage threads or warp the scope body, affecting alignment and zero.

5. Inspect the Scope Internally for Fogging or Mold: Occasionally, aim the scope at a bright surface to check for internal haze, fogging, or fungus growth. If detected, send it to a technician for cleaning and resealing.

Dos and Don’ts

Do’s:

• Use proper 30 mm rings and ensure secure mounting

• Start each session at low magnification for easier target acquisition

• Store with caps on to protect lenses

• Clean only with quality microfiber cloths and optical fluid

• Utilize parallax adjustment and focus before every shot

Don’ts:

• Don’t touch lenses directly with your hands

• Don’t use household cleaners, alcohol, or glass sprays

• Don’t leave the scope exposed to sunlight for prolonged periods

• Don’t attempt to open or repair internal components

• Don’t store the scope damp or in sealed containers

Safety Tips

1. Never Look at the Sun Through the Scope: Looking at the sun—even at low zoom—can cause devastating and permanent eye damage. Never use this scope for solar observation.

2. Always Unload the Rifle Before Handling the Scope: Ensure your firearm is empty before mounting, cleaning, or adjusting the scope. Always prioritize safety to prevent accidental discharge.

3. Keep Away from Children Without Supervision: Scopes are delicate precision instruments. Keep out of reach to avoid accidental damage by curious hands or misuse.

4. Transport in a Safe, Padded Rifle Case: When mounted on a rifle, always store and carry the setup in a proper case to prevent accidental knocks and maintain zero.

5. Avoid Hard Impacts or Dropping the Scope: Even if it’s built to withstand recoil, strong impacts can misalign internal optics. Handle it gently in all conditions.

Why Should You Choose This Product?

1. Versatile 4–16× Zoom Range: It offers enough reach for medium- to long-range shots, yet starts at a comfortable 4× for faster target acquisition and flexibility in various shooting scenarios.

2. Side-Focus Parallax and Fast-Focus Eyepiece: The easy-to-use parallax adjustment and quick-focus eyepiece let you fine-tune clarity for every distance, ensuring precise and sharp targeting.

3. Illumination (If Available) Enhances Low-Light Shooting: For models equipped with illumination, the red/green reticle improves visibility in dawn, dusk, or shaded environments—perfect for hunting or tactical use.

4. Solid Build with Weather-Sealed Construction: Built from aircraft-grade aluminum, this scope is waterproof, fogproof, and shock-resistant, ready for adverse weather and rugged field conditions.

5. Excellent Value for Reliable Mid-Long Range Performance: The Discovery HT 4–16×40 SF delivers premium features—smooth zoom, clear optics, solid turrets—at a budget-friendly price, making it an impressive option for hunters and shooters.