Really Right Stuff B2-FAB 38mm quick-release clamp with 1/4" threaded hole (R-mount)

Really Right Stuff B2-FAB 38 mm quick-release clamp with 1/4" threaded hole for your R-mount setup

With the Really Right Stuff B2-FAB 38 mm quick-release clamp, you’re adding an amazingly compact yet very serious tool to your photo gear. Small, flat, inconspicuous at first glance, but as soon as you’ve used it once on a tripod head or a camera plate, you quickly realize why many people simply leave it mounted permanently. The clamp is specially designed for R-mount setups and offers you a precise, play-free fit for matching dovetail plates.

Precise screw clamp for Arca-style compatible dovetail profiles

The B2-FAB relies on a classic screw clamp that allows you very sensitive and secure tightening. No frantic snapping into place, no accidental popping open, but controlled tightening until everything is rock solid. According to the manufacturer, the coupling accepts Arca-style compatible 38 mm dovetail profiles and works perfectly with Really Right Stuff dovetails, Wimberley dovetails, and Kirk dovetails. This lets you continue using different plates and rails from your existing system without constantly having to screw adapters in between.

Compact dimensions, surprisingly light yet stable

In terms of size, the quick-release clamp keeps pleasantly low-profile. The length is 38 mm, the width is 74 mm, and the height is only 18 mm. This means it barely adds bulk and can be placed very well even on smaller tripod heads or compact ball heads. With a weight of only 67 g, your setup remains light and easy to transport without sacrificing stability. Especially if you’re on the road a lot, maybe even traveling with light luggage, such a slim yet robust clamp is worth its weight in gold.

1/4" threaded hole for flexible mounting options

In the base of the B2-FAB there is a 1/4" threaded hole that gives you plenty of flexibility when mounting. You can attach the quick-release clamp directly to suitable tripod heads, quick-release adapters, or other mounts that use a 1/4" thread. This makes the clamp suitable not only for classic tripods, but also for sliders, video rigs, or special mounts where you need reliable, repeatable clamping. In this way, the B2-FAB quickly becomes a small but central component in your entire setup.

Arca-style compatible for a consistent quick-release system

Since the quick-release clamp is designed to be Arca-style compatible, you can integrate it seamlessly into an existing ARCA system. Camera plates, L-brackets, lens collars, or rails based on the ARCA standard can be clamped securely and released again without having to realign everything each time. This is especially practical if you use multiple cameras or lenses with different plates and still want to maintain a unified quick-release system. It saves you a lot of fiddling in everyday use and lets you focus more on the image than on the gear.

Robust construction, made in the USA

The B2-FAB quick-release clamp is made in the USA and follows the tradition of the very high-quality Really Right Stuff components. The material is designed for durability, the surfaces are cleanly finished, and the edges are precisely milled. When you tighten the screw clamp, you can feel that nothing wobbles or grinds. This kind of haptic feedback, that solid feeling when tightening, is something you quickly learn to appreciate in daily use, especially when it’s cold, windy, or just uncomfortable outside.

Ideal for R-mount users looking for a reliable quick-release system

Especially in combination with R-mount equipment, the B2-FAB plays to its strengths. The compact 38 mm clamping width is an excellent match for small and medium-sized cameras without protruding or blocking unnecessary space. At the same time, you have enough contact area so that ARCA-compatible plates are securely guided. Whether you’re working in the studio, shooting in the city, or setting up a tripod somewhere in the mountains, the clamp ensures a stable, repeatable fit for your camera.

For photographers who prefer shooting to screwing

Ultimately, the Really Right Stuff B2-FAB 38 mm quick-release clamp is aimed at anyone looking for a reliable, ARCA-compatible quick-release system with a screw clamp that takes up little space, is lightweight, and still meets professional demands. If you’re not interested in wobbly, imprecise clamps and instead prefer a clean, solid solution that you mount once and then use for years, this clamp will fit very well into your setup. In short, you tighten it once and can then get back to what really matters: making good images.