Lightweight FFP Optics for a Flexible Mid-Range Setup
The DISCOVERYOPT LHT 4.5-18x42 is a first focal plane MOA rifle scope designed for a flexible mid-range optical setup. It provides 4.5x to 18x magnification and a stated field of view from 26.0 ft to 6.4 ft at 100 yards, while the 42 mm objective designation is paired with a 48 mm outside objective diameter.
At 335 mm long and 515 g, the scope combines a useful magnification range with a compact overall format. The 30 mm main tube requires compatible 30 mm rings, which are not included in the package.
First Focal Plane MOA Reticle
The first focal plane reticle changes apparent size with magnification, keeping its subtensions proportional across the full 4.5x to 18x range. This allows the MOA reticle references to be used consistently without limiting the user to one magnification setting.
Red reticle illumination provides six brightness settings so the visible reticle can be adapted to different light conditions. Illumination is powered by a CR2032 battery.
Locking Turrets and MOA Adjustment
The LHT uses locking turrets with a 0.25 MOA click value. The manufacturer specifies 86 MOA of elevation adjustment and 60 MOA of windage adjustment, providing a clearly defined correction range for zeroing and subsequent adjustments.
Locking turret controls help reduce unintentional movement after the selected setting has been established. Always verify zero and adjustment direction in a controlled setting before field use.
Side Parallax, Field of View and Eye Position
Side parallax adjustment runs from 10 yards to infinity, supporting short-distance setup as well as longer-distance viewing. Field of view is specified as 26.0 ft at the low end and 6.4 ft at the high end per 100 yards, equivalent to 7.9 m to 1.9 m.
Exit pupil ranges from 9.0 mm to 2.2 mm. The stated eye-relief range is 3.5 inches to 3.3 inches, equivalent to approximately 8.9 cm to 8.5 cm. Set the eyepiece, parallax and magnification for a clear, comfortable view before making fine adjustments.
Illumination and Field-Ready Construction
The optical system is nitrogen purged, while the IP67 rating provides a defined level of ingress protection when the scope is correctly assembled, closed and maintained.
DISCOVERYOPT lists a .300 WM recoil rating for this model. Installation, mounting hardware and torque must remain suitable for the specific equipment and intended use.
Specifications
| Specification |
Details |
| Brand |
DISCOVERYOPT |
| Model |
LHT 4.5-18X42SFIR FFP-MOA |
| Product type |
Rifle scope |
| Magnification |
4.5x to 18x |
| Objective designation |
42 mm |
| Outside objective diameter |
48 mm |
| Focal plane |
First focal plane (FFP) |
| Reticle system |
MOA |
| Main tube diameter |
30 mm |
| Illumination |
Red, six brightness settings |
| Click value |
0.25 MOA |
| Turret type |
Locking turrets |
| Elevation adjustment range |
86 MOA |
| Windage adjustment range |
60 MOA |
| Field of view at 100 yd |
26.0 to 6.4 ft / 7.9 to 1.9 m |
| Exit pupil |
9.0 to 2.2 mm |
| Eye relief |
3.5 to 3.3 in / 8.9 to 8.5 cm |
| Parallax adjustment |
10 yd to infinity |
| Recoil rating |
.300 WM, as stated by the manufacturer |
| Fog protection |
Nitrogen purged |
| Ingress protection |
IP67 |
| Battery |
CR2032 |
| Length |
13.2 in / 335 mm |
| Weight |
18.2 oz / 515 g |
Installation, Use and Care
- Use compatible 30 mm scope rings; rings are not included.
- Confirm that the mounting base, rings and fasteners are suitable for the specific equipment before installation.
- DISCOVERYOPT recommends tightening ring screws to 15 to 18 in-lb with a torque wrench and using a cross pattern for even clamping.
- Set the eyepiece focus and side parallax before fine adjustment, then verify zero in a controlled setting.
- Fit the CR2032 battery with the correct polarity and remove it before extended storage.
- Keep optical surfaces clean with suitable lens-cleaning materials and keep protective caps fitted when the scope is not in use.
- Follow all applicable equipment, range and firearm-safety procedures.
Package Contents
- 1 x DISCOVERYOPT LHT 4.5-18x42 Rifle Scope
- 2 x Spec Cards
- 1 x User Manual
- 1 x Scope Sunshade
- 1 x Lens Cleaning Cloth
- 1 x Scope Coin
- 1 x Warranty Card and QC Card
- 1 x Lens Cap
Scope rings are not included.
Frequently Asked Questions
Is the reticle first focal plane?
Yes. The MOA reticle is positioned in the first focal plane, so its apparent size changes with magnification and its subtensions remain proportional throughout the 4.5x to 18x range.
What size scope rings are required?
The scope has a 30 mm main tube and requires compatible 30 mm rings. Scope rings are not included.
What is the parallax adjustment range?
Side parallax adjustment runs from 10 yards to infinity.
Does the reticle have illumination?
Yes. The reticle has red illumination with six brightness settings and uses a CR2032 battery.
What are the elevation and windage adjustment ranges?
The manufacturer specifies 86 MOA of elevation adjustment and 60 MOA of windage adjustment, with a 0.25 MOA click value.
Is the scope protected for outdoor use?
The scope is nitrogen purged and carries an IP67 ingress-protection rating. Correct installation, closed covers and appropriate maintenance remain important.
What is included in the package?
The package includes the rifle scope, two spec cards, a user manual, sunshade, lens cleaning cloth, scope coin, warranty and QC card, and lens cap. Scope rings are not included.
