Guide Orion O635CS 2-in-1 Thermal Clip-On & Monocular

The Guide Orion O635CS delivers true 640 × 512 thermal resolution at 12 μm pixel pitch with 15 mK NETD in a 285-gram chassis that detaches as a handheld monocular.

Key Features

• 640 × 512 @ 12 μm sensor with 15 mK NETD — full 640-class resolution, for cleaner hot-target edges at long range
• 35 mm F0.9 lens — fast aperture for low-radiation scenes; 12.5° × 9.4° field of view (22 × 17 m at 100 m), wider than typical 50 mm 640 clip-ons for faster target acquisition during scan
• 0.49" 1920 × 1080 AMOLED display — a full-HD eyepiece display for the 640 × 512 image; deep blacks help separate warm targets from ambient terrain
• Seven image palettes — White Hot, Black Hot, Red Hot, Green Hot, Iron Red, Blue Hot, Sepia
• 2-in-1 — clip-on or handheld — slide ahead of your day scope or detach and scan with screen zoom; no separate eyepiece adapter, no second device to carry
• 6000J recoil rating — Guide's published shock and recoil spec
• Replaceable 18500 batteries (×2 included) — a replaceable battery rather than a sealed cell; two batteries cover a full night's hunt with no USB charging downtime
• IP67 weatherproof — rated for rain, dew, and dust; survives the conditions that put lesser units in the case
• Hyper-Light 2.0 image processing — Guide's contrast and detection algorithm tightens warm-body edges against thermally messy backgrounds (rocky ground, leaf litter, dewpoint fog)
• 285 g / 10.05 oz — Guide calls it one of the lightest 640×512 thermal clip-ons on the market

Comparing models? See where the O635CS fits in the full Guide Sensmart thermal lineup, or browse our other thermal clip-ons.

Ideal For

• Serious predator hunters at the 200–400+ yard range where 640-class detail matters more than a 50 mm objective
• Hunters running precision rifle in bolt or AR platform with quality day glass who want to extend hunting hours without abandoning their daytime zero — the 6000J recoil rating handles full-power calibers and the clip-on form factor preserves zero on the host scope
• Stand hunters and scanners who want a single tool that mounts when they're ready to shoot and detaches when they're scanning — no second monocular in the pack
• Buyers who want to bypass the smart-feature tax — the O635CS leaves out WiFi, an app and onboard recording

Accessories & Compatibility

• Threaded for adapter mounts — the Rusan MAR quick-release bell-mount (with Rusan's M33.5 connector) or a Picatinny rail adapter, available separately; Guide's own adapter rings are optional too
• Pairs with any SFP or FFP daylight rifle scope. For SFP scopes, zero at the magnification you'll hunt at — host-scope misalignment with a clip-on amplifies linearly with magnification
• Ships with two 18500 batteries, charger, USB-A to USB-C cable, lint-free cloth, and a soft carry bag
• 5-year manufacturer warranty (10 years on the thermal sensor) backed by Guide's US-based repair center in Texas