How to Use the AOF-18 Multi-Color Filter Set Outdoors

Quick answer

To use the Fenix AOF-18 Multi-Color Filter Set, slide the 68mm adapter onto the head of your Fenix HT18R V2.0, choose the red, green, blue, or yellow lens for your task, and secure it before you head out. Red preserves night vision and is less noticeable to game, green improves map reading and tracking, blue highlights blood trails, and yellow cuts through fog or dust. Always test the fit and function in daylight before relying on it outdoors.

Match each lens color to the job

The AOF-18 set includes four lenses, each with a distinct outdoor purpose. Red light is the classic choice for hunting and tracking because it helps preserve your night-adapted vision and is less likely to spook game. Green light is useful for reading maps and navigating without destroying your night vision, and it also works well for tracking. Blue light makes blood trails stand out against vegetation, which can help after a shot. Yellow light cuts through fog, dust, and rain by reducing the blue light that scatters in those conditions.

A common mistake is assuming one color fits every situation. If you are moving through thick brush at night, red may be your best bet; if you are reading a topo map in the dark, green will serve you better. Carry all four lenses so you can switch as conditions change.

Install the adapter and lens correctly

The AOF-18 adapter is 2.68 inches (68mm) and is designed to fit securely on the Fenix HT18R V2.0 flashlight head. To install, slide the adapter over the bezel until it seats fully, then press the chosen color lens into the adapter. Give it a gentle tug to confirm it is locked in place. If you are using a different Fenix model, check compatibility before forcing the adapter; the AOF-18 is sized specifically for the HT18R V2.0.

A frequent error is not pushing the adapter all the way down, which can leave a gap that lets light leak around the edges and reduces the filter's effectiveness. Another mistake is overtightening or twisting the lens, which can crack the filter. If the fit feels loose, stop and verify you have the correct adapter for your light.

Practice with the filters before you need them

Before you rely on the AOF-18 in the field, spend 10 minutes in your backyard or a dark room testing each lens. Notice how the beam pattern changes and how far you can see with each color. Red and green will appear dimmer than white light because the filter blocks other wavelengths, so you may need to use a higher brightness setting to compensate. This is normal and not a defect.

Check that the adapter stays put when you attach or remove the light from a pocket, pouch, or weapon mount. A filter that shifts during movement can ruin your night vision or give away your position. If you plan to use the light on a rifle, confirm the adapter does not interfere with your mount or pressure switch.

Care and storage for reliable performance

Clean the lenses with a soft, dry microfiber cloth. Avoid harsh chemicals or abrasive materials that can scratch the filter coating. When not in use, store the lenses in a protective case or pouch to prevent cracks and dust buildup. The adapter itself can be wiped down with a damp cloth and mild soap if it gets muddy.

Inspect the adapter and lenses before each trip. Look for cracks, deep scratches, or a loose fit. A damaged filter can distort the beam or fall off at the worst moment. If you notice any damage, replace the lens or adapter rather than trying to repair it in the field.

Step-by-step: using the AOF-18 outdoors

1. Choose your lens color: Pick red for hunting and preserving night vision, green for map reading and tracking, blue for blood trails, or yellow for fog and dust. Match the color to your primary task before you leave. Checkpoint: If you are unsure, start with red for general night use and green for navigation.
2. Attach the adapter to your HT18R V2.0: Slide the 68mm adapter over the flashlight head until it seats fully. Do not force it onto a different model; the AOF-18 is sized for the HT18R V2.0. Common mistake: Leaving a gap between the adapter and the bezel, which causes light leakage.
3. Insert the lens and secure it: Press the chosen color lens into the adapter until it is flush. Give it a gentle tug to confirm it will not fall out during movement. Checkpoint: If the lens feels loose, remove it and reseat it; do not overtighten.
4. Test the beam and brightness: Turn on the light and check the beam pattern. Colored filters reduce overall output, so you may need a higher brightness setting. Test in a dark area before your trip. Common mistake: Assuming the filter is defective because the light looks dimmer; this is normal.
5. Use and adjust as conditions change: Switch lenses as needed. For example, use red while moving to a stand, then switch to blue when tracking a blood trail. Keep unused lenses in a protective pouch. Next step: After your trip, clean the lenses and inspect the adapter for damage before storing.

Product facts

• AOF-18 Multi-Color Filter Set: The AOF-18 Multi-Color Filter Set includes red, green, blue, and yellow lenses and a 2.68-inch (68mm) adapter designed for the Fenix HT18R V2.0 flashlight. This gives you four distinct lighting options in one kit, so you can adapt to hunting, tracking, signaling, and navigation without carrying separate lights.