Opticron 8x25 T4 Trailfinder WP Monocular (Black)

BH #OP8X25T4TMB • MFR #30710
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Opticron 8x25 T4 Trailfinder WP Monocular (Black)
Key Features
  • Compact BAK4 Roof Prisms
  • Broadband Fully Multi-Coated Optics
  • Short 5' Close Focus Distance
  • Nitrogen-Filled, Water and Fogproof
With an easy-to-hold compact design, the Opticron 8x25 T4 Trailfinder Monocular is outfitted with a small objective lens and space-saving roof prism to produce an optic that fits comfortably in the hand, yet remains versatile and portable. Added to that, are features that boost performance for a wide array of uses in challenging environmental conditions.
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Opticron Trailfinder Overview

With an easy-to-hold compact design, the Opticron 8x25 T4 Trailfinder Monocular is outfitted with a small objective lens and space-saving roof prism to produce an optic that fits comfortably in the hand, yet remains versatile and portable. Added to that, are features that boost performance for a wide array of uses in challenging environmental conditions.

These features begin with BAK4 roof prisms and broadband fully multi-coated optics that work together to deliver bright and clear high-contrast images with accurate color rendition through the entire visible spectrum across its generous field of view. For those who want to make detailed observations at close range, the T4's minimum focus distance is under 5 feet so viewing nearby birds, bugs, flora, and fauna is comfortable and easy. A long eye relief and comfortable exit pupil, when combined with the optical performance, present the user with an immersive observational experience in the field, on the range, at the arena, or just sightseeing around town.

With the T4 monocular, the light weight allows you to keep it at the ready in your pocket or around your neck for glassing on-the-go. The chassis is made of aluminum alloy to help keep the weight low without sacrificing strength, stability, or durability; and its optical tubes are nitrogen-filled and O-ring sealed to be waterproof and resistant to internal fogging. A protective black rubber armor provides a slip-resistant grip, with a textured palm pad added for improved grip security in cold and wet weather.

Optical Performance
  • Moderate 8x magnification brings subjects close without sacrificing field of view or exit pupil, which is common with high-power optics
  • 25mm objective lenses keep the form factor small for easier packing and handling
  • Roof prism optical path helps to keep the optical tubes slim to be comfortable to hold
  • BAK4 prisms deliver a round exit pupil, and a crisp and clear image with limited edge distortion
  • Proprietary High Light Transmission (HLT) broadband anti-reflection fully multi-coated optics maximize light transmission to help produce accurate color fidelity across the entire visual spectrum, and further improve contrast and brightness
  • Short 5-foot minimum focus distance enables detailed observations of bugs, birds, flowers, and other plants at close range
  • 357-foot field of view at 1000 yards
Use and Handling
  • Textured slip-resistant focusing ring is easy to manipulate, even when wearing gloves
  • 2-stage twist-up click-stop eyecup for comfortable use with or without eyewear
  • Long 17mm eye relief makes long-duration glassing sessions comfortable without eye strain
  • 3.1mm exit pupil
Construction Details
  • Compact 3.9x1.4" design fits easily and comfortably in the palm of the hand
  • Aluminum chassis produces a lightweight optic without sacrificing strength or stability
  • Nitrogen-filled and O-ring sealed to be waterproof, and resistant to internal fogging when moving through extreme temperature changes
  • Protective black rubber armor provides a slip-resistant grip
  • Textured palm pads improve grip security and stability — especially in wet weather
  • Light 4.6-ounce weight won't add excessive bulk or cause strain when hung from the neck

Opticron Trailfinder Specs

Key Specs
Prism Type
Roof (BAK4)
Magnification
8x
Objective Lens Diameter
25 mm
Angle of View
6.8° (Actual)
Field of View
357' @ 1000 yd / 118.5 m @ 1000 m
Exit Pupil Diameter
3.1 mm
Prism Type
Roof (BAK4)
Performance
Magnification
8x
Objective Lens Diameter
25 mm
Angle of View
6.8° (Actual)
Field of View
357' @ 1000 yd / 118.5 m @ 1000 m
Minimum Focus Distance
4.9' / 1.5 m
Exit Pupil Diameter
3.1 mm
Eye Relief
17 mm
Features
Fogproof
Yes: Nitrogen Filled
Environmental Resistance
Water-Resistant (Unrated)
General
Tripod Mounting Thread
No
Dimensions
3.9 x 1.4" / 9.9 x 3.6 cm
Weight
4.6 oz / 130.4 g
Packaging Info
Package Weight
0.46 lb
Box Dimensions (LxWxH)
5.9 x 2.4 x 2.3"

Opticron Trailfinder Reviews

great bang-for-buck; excellent close-focusing

By Richard
Rated 4 out of 5
Date: 2023-05-03

This Opticron monocular is a very good bang-for-the-bucks. Comparing it to the Vortex 8x25 Solo monocular (which I also have), the Opticron has better eye-relief, a better multi-position twist-up eye-piece, and VERY significantly, a close focus distance of 5' vs the Vortex 16'. This excellent minimum focus distance is the main reason I bought the Opticron even though I owned the Vortex. If you intend to use the device for birding, etc, the Vortex would be pretty poor, while the Opticron would be excellent. As far as performance, I'd say they are about equal; both are sharp and fairly bright for a small device. As far as the build, etc, the Vortex is more stylish with nice grippy areas, but because of this it is a fair amount larger. The Opticron is very small and light and I prefer it because of that. There are complaints about the focusing lever on the Opticron. It is very sensitive - not loose or sloppy, but sliding it a small amount can change the focus, so you have to be pretty careful using it. But, on the good side, it is smooth, reliable, and somewhat stiff, so once you get used to how little you have to move it, you can accurately focus. The Vortex is notoriously stiff and hard to turn, although with that you can use your thumb and fingers to grip it and turn it, so it isn't too bad. It requires a lot more of a turn to change focus vs the Opticron, which is good because it is easier to fine-tune the Vortex. On the whole, I like the focusing better on the Vortex even though it is very stiff. But with some practice you can get as accurate a focus with the Opticron. So generally I prefer the Opticron - smaller, lighter, less expensive, and with the MUCH better close focusing ability.

Plain looking but does the job

By Charles
Rated 4 out of 5
Date: 2019-09-23

This monocular will never win a beauty contest. But it’s compact, gets reasonably close, and has decent optics, (slightly tight) one-hand focusing, and a reasonable price. I use it mostly to put serious optical zoom on my iPhone, since all other supposed solutions turned out to be useless or obviously ridiculous. With an inexpensive mount over the 30 mm iPhone camera, it does a good job at resolving tiny objects for both my eye and my phone.

See any errors on this page?

What is the lever on the side? Is that the ...

What is the lever on the side? Is that the focusing mechanism?
Asked by: Collin
The lever on the Opticron 8x25 T4 Trailfinder WP Monocular (Black) BH #OP8X25T4TMB • MFR #30710 is for focusing.
Answered by: John
Date published: 2021-11-21

does it have a tripod mount ?

does it have a tripod mount ?
Asked by: Glenn
The Opticron 8x25 T4 Trailfinder WP Monocular (Black) BH #OP8X25T4TMB • MFR #30710 has no tripod mount.
Answered by: John
Date published: 2022-11-07
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