Guide · Orion O435CS

How far you can see a person

112 m make out detail182 m tell what it is729 m spot it┆ maker’s claim

501002005001k2k5k m

Calculated from the sensor's pixel pitch and the lens focal length, for clear air.

Guide quotes 1,800 m, 2.5× our figure, because makers usually measure against a person’s full height rather than their width. Why the numbers differ

GuideClip-on · 400-class

Guide Orion O435CS

Name: Guide Orion O435CS
Brand: Guide
Price: 1399 USD

Price and availability on Guide’s site may differ.

Best for

Keeping your day scope and its zero while adding thermal at night

01Specifications

As published by Guide. Sources: guideir-thermal.com, guideoutdoor.com (single replaceable 18500 cell).

From the published specs, not owner reports.

For it

Sensitive sensor that picks out small heat differences on humid or rainy nights (the best of 285 that publish it)
Swappable battery pack, so a spare doubles the run time
8 h of battery
Light at 10.1 oz, the lightest of the 29 clip-ons here
Waterproof (IP67), survives a dunking
Warranty: 5 years (10 years on sensor)
~$1,399, well under the ~$3,499 typical for clip-ons here

Against it