Description
Long glassing sessions are where hand shake and arm fatigue start eating into what you can spot, and that's exactly the problem the Really Right Stuff Cinch-LR Polymer Bino Adapter solves. It clamps around one barrel of your binocular and mounts to your tripod or monopod, giving you a stable, hands-free view for picking apart a hillside or watching a distant edge until something moves. The molded-in dovetail rides low, so you can leave the adapter on the binos and still tuck them into most chest harnesses without a fight.
What the Cinch-LR Polymer Adapter Fits
The strap grip adjusts to housing widths from 1.77 inches to 2.56 inches, which covers the majority of full-size and mid-size binoculars, whether they're open bridge or closed bridge. Owners have run it happily on everything from Leupold BX-4s to Leica Geovids and Swarovski EL glass. It works on rangefinding binos too, and the infinite adjustment means once you dial in your fit it stays repeatable trip after trip. If you're running 56mm or larger 15x and 18x binoculars, the machined aluminum version is the sturdier pick, but for standard 8x through 12×42 glass this polymer model holds plenty tight.
Mounting the Cinch-LR on Your Setup
The base carries the RRS 1.5-inch dovetail, so it drops straight into Arca-style clamps and most ball head quick-release receivers. There's also a 1/4"-20 socket on the bottom if you want to run it on a different system, plus Manfrotto RC2 compatibility built in. You can orient it perpendicular or parallel to the optical plane for smooth panning, and the removable strap can be routed with the excess tucked along the housing to keep things clean.
Molded from glass-filled nylon and made in the USA, the Cinch-LR weighs next to nothing at 1.6 ounces, so it adds no real bulk to your pack or your glass. It's a straightforward piece of kit that does one job and does it well: keeping your binos steady so your eyes stay fresh.
Key Specifications
- Manufacturer: Really Right Stuff
- Manufacturer Part Number: CINCH-LR
- UPC: 818413027862
- Material: Glass-Filled Nylon Polymer
- Binocular Fit Range: 1.77" to 2.56" housing width
- Mounting Interface: RRS 1.5" and Arca-Style Dovetail; 1/4"-20 Threaded Socket
- Length: 2.64" (67 mm)
- Height: 1.98" (50 mm)
- Width: 1.67" (42 mm)
- Weight: 1.6 oz (45 g)
- Binocular Mounting: Adjustable Strap
- Made In: USA
What’s Included
- Really Right Stuff Cinch-LR Polymer Bino Adapter
- Removable adjustable strap
Frequently Asked Questions
Will the Cinch-LR bino adapter fit my binoculars?
It's built to grip binocular housings from 1.77 inches to 2.56 inches wide, which covers most full-size and mid-size glass in the 8x through 12×42 range. It handles both open bridge and closed bridge designs, so brands like Leupold, Leica, and Swarovski have all worked well for owners. Binos with unusual humps or contours near the barrel can be trickier to get snug, so measure your housing before ordering.
What tripods and heads does the Cinch-LR Polymer Adapter work with?
The base uses the RRS 1.5-inch dovetail, which drops right into Arca-style clamps and most ball head quick-release receivers. If you run a different system, there's a 1/4"-20 socket on the bottom, plus Manfrotto RC2 compatibility. That gives you a few ways to mount it no matter what setup you already own.
Can I leave the Cinch-LR adapter on my binos in a chest harness?
Yes. It's designed as a semi-permanent clamp with a low profile, so it stays out of the way when you're hand-holding the binos and tucks into most factory chest harnesses without a problem. Many owners leave it mounted full-time and only pull the binos onto the tripod when they need steady glassing.
How does the polymer Cinch-LR compare to the aluminum version?
The polymer model is lighter and easier on the wallet while still holding standard binoculars very securely. The machined aluminum Cinch-LR Elite has zero flex and is the better call for heavy 15x and 18x binoculars. For typical 8x through 12×42 glass, the polymer version does the job just fine.





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