Really Right Stuff B2-mAS F 38mm quick-release clamp (R-mount)

Really Right Stuff B2-mAS F 38mm quick-release clamp (R-Mount) for precise camera mounting

Sometimes it’s the small parts that make the difference in everyday photography. The Really Right Stuff B2-mAS F 38mm quick-release clamp is exactly such an inconspicuous but extremely useful helper when you want to mount your camera on the tripod head securely, with repeatable precision and without any fiddling. Compact, stable, surprisingly versatile in use, and pleasantly straightforward to handle.

Arca-style compatible, precise fit for 38 mm dovetail

The B2-mAS F accepts Arca-style compatible (according to the manufacturer) 38 mm dovetail profiles and thus integrates seamlessly into a professional quick-release system that many ambitious photographers already use. You can directly attach suitable L-brackets, macro rails or lens plates and secure them with the precise screw clamp. This keeps your equipment steady, free of play and without wobble on the tripod head, which is extremely helpful especially with longer focal lengths or in macro photography.

Made in the USA, high-quality construction from 6061-T6 aluminum

The quick-release clamp is made from 6061-T6 aluminum, a robust material widely used in the professional sector. This material provides a very good ratio of strength to weight, so the clamp remains pleasantly light at only 64 g while still feeling very solid. The surface is Type II black anodized, which not only provides a discreet, low-reflection appearance, but also reliably protects the clamp from wear and corrosion. As soon as you touch it, you can tell that nothing here feels “cheap”, but rather cleanly milled and properly finished.

R-Mount anti-twist protection, secure stop for stable alignment

Thanks to the integrated R-Mount anti-twist protection or stop, the quick-release clamp stays exactly where you screw it down. Especially when you use the clamp as an adapter or intermediate piece, this anti-twist feature prevents the unit from gradually loosening or twisting under lateral load. This is particularly practical when working with heavier cameras or when you frequently change orientation without wanting to realign everything from scratch each time.

Versatile mounting with 3/8", M6 and 1/4", flexible use on many tripod heads

In the center of the clamp there is a through hole with a 3/8" thread. This mount is designed so that it can also accept M6 or 1/4" countersunk screws from above. This allows you to mount the B2-mAS F on a wide range of tripod heads, ball heads or special brackets. In addition, the clamp can be attached to all tripod heads with 1/4", 6 mm or, with the help of an optional reducer, also with 3/8" internal threads. In short: if you use a reasonably common tripod system, the chances are very good that this clamp can be integrated without any problems.

Integrated dovetail clamping profile on the underside

An integrated dovetail clamping profile is machined into the underside of the B2-mAS F. This means that the clamp does not only serve as a top side for plates, but can itself be clamped into a corresponding Arca-style compatible profile. This dual function gives you very flexible setups, for example when you want to combine multiple levels or realize special configurations with macro rails, brackets or rails.

Ideal as a right-angle adapter on macro rails

Thanks to its compact design and integrated dovetail profile, the B2-mAS F is particularly well suited as a right-angle adapter on macro rails. You can mount the clamp on the macro rail and then attach your camera or an L-bracket on top to create precisely right-angled setups. Especially in macro photography, where millimeters and sometimes even tenths of a millimeter matter, this clean, reproducible alignment is worth its weight in gold. This makes it much easier to carry out focus stacks, stacking series or very precise product shots.

Screw clamp for controlled, secure fastening

The B2-mAS F uses a classic screw clamp. That may sound unspectacular, but it has clear advantages in everyday use. You can fine-tune the clamping force very precisely, first lightly securing plates, aligning them and then tightening them fully. The locking knob is permanently attached so you can’t accidentally unscrew it or lose it on the go. Especially when working outdoors and perhaps in the dark or with gloves, this robust, simple solution is often more reliable than complicated mechanisms.

Compact dimensions and low weight, small but not fiddly

With a length of 38 mm and a width of 74 mm, the quick-release clamp offers enough contact area for common plates without taking up unnecessary space in your camera bag. The width including the knurled knob is 68 mm, which keeps the control knob easy to reach. The height of the clamp is 15 mm, and with the knurled knob you reach about 20.4 mm. The total weight of around 64 g keeps the unit pleasantly light, so it doesn’t add noticeable weight even on travel or carbon tripods. Small, yet easy to grip and surprisingly comfortable to handle.

Compatibility note, not suitable for NOVOFLEX profiles

One important point to keep in mind before purchasing: this quick-release clamp does not accept NOVOFLEX profiles. So if you already use a system with NOVOFLEX plates, this clamp is not intended for that. For everyone who consistently relies on Arca-style compatible 38 mm dovetail plates, however, this is no issue and rather a clear distinction.

Type II black anodized surface for long-lasting use

The Type II black anodized surface protects the 6061-T6 aluminum from scratches and the elements while also providing a discreet, professional look. The dark coating reflects very little light, which is pleasant in the studio, for product photography or in situations with strong light sources, as it prevents distracting reflections. In addition, the clamp is easy to clean if it picks up some dust or moisture during outdoor use.

Practical addition to your Arca-style system

If you already work with Arca-style compatible plates and rails, the Really Right Stuff B2-mAS F 38mm quick-release clamp integrates seamlessly into your existing setup. It is suitable as an additional clamp for a second tripod head, as an add-on for a macro rail or as a compact adapter to connect various components. Thanks to the R-Mount anti-twist protection, the screw clamp and the versatile thread options, you get a small but very well thought-out component that quickly becomes indispensable in everyday use.