Featured Armasight Collector 640: Compact Thermal Weapon Sight Recoil Staff August 19, 2025 Join the Conversation At RECOIL, we review every product fairly and without bias. Making a purchase through one of our links may earn us a small commission, and helps support independent gun reviews. Read our affiliate policy. Find out more about how we test products. Sponsored ContentSmall but not too small, the Armasight Collector 640 thermal weapon sight is a powerhouse packed into a small, versatile form factor. With no extra bulk or anything that isn’t needed, the Collector focuses on getting the job done and doing it with some style.Is it the best thermal sight for you? Read on and we’ll find out.SPECSDetector Type: ArmaCORE™ 640×480 12um Thermal Core Refresh Rate: 60 Hz Thermal Sensitivity: NETD < 40mK Detection Range: 932m on a Human Sized Target Recognition Range: 233m on a Human Sized Target Identification Range: 146m on a Human Sized Target Eye Relief: 45mm Field of View: 18.18° x 13.73° Optical Magnification: 1x Digital Zoom: 1 – 4x (1 – 4x total magnification) Display: XGA (1024 x 768) OLED Wireless: None Graphics: Active On-Screen Graphics and Iconology Recoil Rating: .308 Lens System: F/1.00; 25mm Diopter Adjustment: -5 to +5 dpt Power Supply: 2 x CR123A (3V) or 1 x 16650 (3V) Battery Life: 4 hours at 20° C Memory: 4 Hours of Video Image Processing: Digital Enhancement Environmental Rating: IP67 Operating Temperature: -40° C to +50° C (-40° F to + 122° F) Dimensions: 171.70 x 77.22 x 77.72 mm / 6.76 x 3.04 x 3.06 in Weight: 492g / 1.08lbs. w/ rubber eyecup; no battery Warranty: 3 years w/ registration Color: Black MSRP: $3,500FEATURESMultiple Color Palettes Intuitive 3-Button Controls 8+ Reticle Types 4 Hour Runtime at 20° C Image Detail Enhancement 1/2MOA Boresight Standard Picatinny Mount Included Video Recording & Image Capture USB Video Stream USB-C Interface for External Devices Inclinometer Levelometer Angle Cosine Indicator Reticle ON/OFF Selection Battery Status Indicator ULTEM Composite Body and Ergonomic Design Designed and Assembled in the USA from U.S. and Global ComponentsIN THE FIELDSometimes bigger is better, but maybe not when it comes to firearm accessories. The Collector is one of the smallest Armasight units, and in a lot of ways, that makes it one of the best. While the larger Commander 640 1.5-6x35mm has a longer detection range, the Collector is smaller in every way and more lightweight. Even with two batteries installed, the Collector weighed less than most LPVOs. Because of this smaller form factor, it can be more versatile in the field. Even though this is designed as a weapon sight, its small size makes it great for detaching from the rifle and using it as a handheld device. Remounting should come with a zero check, but in our use, the Collector returned to zero without issue when installed back onto the same rifle and in the same Picatiny slot. The menu and options are standard across Armasight’s offerings, making switching between units extremely easy. A 3-button design makes navigating the menu super easy, even in the field. While it’s worth it to take the time to set up things like reticle choice before you hit the range, changing your mind or trying new options is quick and easy.Like other Amrasight thermal optics, the Collector has a wide range of reticle options, colors, and color pallets for the thermal image. These extra options help the Collector stay effective through a wide range of weather and thermal conditions. Rated for up to .308 Winchester, the Collector is great for any hunter looking to expand and redefine what they are capable of. The reticle and ease of zeroing is great as a standalone weapon sight, but the compact size makes using the Collector for scouting and glassing just as easy. Powered by the ArmaCORE 640 thermal core, every image is surprisingly crisp and well defined. Even in less-than-ideal thermal conditions, heat sources like animals are easy to make out much further than you might expect. The box listed max range is over 900 meters, and we’ve used the Collector well past 800 meters for detection. This range allows not only easier spotting of smaller animals, but also increases the safety when hunting in low-light conditions, making you more aware of what is around you. On-board picture and video recording is activated with a press of the button and stores the files internally on the Collector. Copying and sharing the files is done via the USB-C port. This is honestly one of the things that makes thermal optics awesome because not only can you share your adventures, you can also look back and review the game tape for what you might have done better or do differently on the next hunt, trip, or however else you use the Collector.LOOSE ROUNDSHaving gotten to use a wide range of Armasight’s thermal optics, the Collector 640 is a favorite for its size and ease of use. While the detection range is shorter than the larger Commander 640, the Collector still gets the job done with room to spare. Lightweight, easy to use, and packed with the same great features found in the larger models — the Collector is a winner for keeping things minimal and getting the most out of them. Why you can trust RECOIL Since our founding in 2012, RECOIL remains the premier firearms lifestyle publication for the modern shooting enthusiast. We deliver cutting-edge coverage of guns, gear, accessories and technology. We go beyond basic reviews, providing no B.S. buyer’s guides, hands-on testing and expert analysis on everything from firearms and survival equipment to watches and vehicles. Our reviewers are the backbone of our operation and come from diverse shooting backgrounds: Former law enforcement, military veterans, competitive shooters, seasoned hunters and plain old firearms enthusiasts. 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