SmallRig Rosette Extension Arm for Sony FS5 / FS7 Grip – ARRI 1870 (1870)

What it is and why people buy it

This SmallRig rosette extension arm is an add-on for camera rigs that need more reach and better positioning at the handle area. In practical terms, it sits between your grip setup and the forward/back accessories you want to run, gun and balance during handheld shooting.

The key selling point, on paper, is the combination of an adjustable extension length and rosette compatibility. The arm follows the ARRI Standard 1870 on both ends, so you can build around a familiar rosette workflow rather than being locked into one fixed arrangement.

It’s designed for people who already have (or plan to have) a handle-based rig and want the flexibility to move attachment points without dismantling everything.

How the adjustable NATO rail helps in real use

A built-in NATO rail runs through the middle of the extension arm. Instead of swapping parts or relying on one fixed position, you adjust the forward/back distance by tightening and loosening the M5 knurled screw.

The extension range is given as 168 to 255 mm, so you can go from a tighter, more compact grip setup to a longer reach for shots where your framing and balance benefit from moving the handle/accessory further away.

If you’re doing quick changes on set (run-and-gun style, moving between handheld and shorter working positions), this kind of “make it fit in seconds” adjustment is usually where extension arms earn their keep. It’s not about making the camera feel completely different every time, it’s about removing friction when you need to re-position.

One limitation to keep in mind: the design is meant for rosette-based systems. If your rig isn’t set up for ARRI 1870-style rosettes, the extension arm may end up being more hassle than help.

Rosette compatibility: ARRI 1870 focus

The arm is equipped with rosettes (M6, 31.8 mm diameter) on opposite ends to suit the ARRI standard. The description also notes compatibility with an accessory rosette for the ARRI standard.

This matters because rosette ecosystems are often how modular rigs stay flexible. With the correct adapters or rosette handles, you’re able to attach extra parts at the ends of the extension arm.

The entry also mentions that the rosette for the ARRI standard can attach rosette handles such as SMALLRIG wooden handle 1941 and rosette handle 1810. It also states the rosette can attach the Sony FS5 camcorder base plate 1827 and other rosette devices.

So, rather than being a single-purpose handle extension, it’s positioned as a connector piece for building out a rig.

Where it shines (and what to watch)

Where it shines

• When you want adjustability in handle/accessory positioning without constantly changing mounting parts.
• If your existing rig uses ARRI 1870-style rosettes or you’re actively building around that system.
• For run-and-gun setups where being able to extend within a given range (168 to 255 mm) helps you re-balance quickly.

What to watch before buying

• This is an extension arm for a specific rosette ecosystem. If you’re not already using rosette handles or accessories designed for ARRI 1870, you may not get much use out of it.
• The description doesn’t mention camera-specific mounting instructions or whether every combination you own will fit cleanly—so it’s worth double-checking what you currently have before committing.

Who it suits best

It tends to make the most sense for shooters who are already working with a modular rig and care about repositioning handles during a shoot. Think operators who switch between tighter control and longer reach, and who want adjustments to be quick.

It’s also a sensible purchase if you’re in the “small changes, big workflow” camp—someone who wants to refine rig ergonomics rather than replace the whole setup.

Getting the most from it

If you’re planning a build, start by mapping what you currently mount to the camera handle area, then decide where you want the handle/accessory to sit relative to the camera.

In a typical run-and-gun scenario, you might begin with a shorter extension for compact movement, then extend towards the upper range when you need a different hold position for framing stability. The NATO rail adjustment is what makes that sort of change manageable.

Also, pay attention to the rosette standard you’re working with. The arm is described around ARRI 1870 rosettes (M6, 31.8 mm diameter), and the rest of your accessories should be compatible with that approach.

Final verdict

If you’re building or maintaining a modular handle setup for Sony FS5 / FS7 and you’re already operating with ARRI 1870 rosette-style accessories, the SmallRig rosette extension arm is worth considering. The NATO rail adjustment and the defined extension range are practical for re-positioning your handle/accessory point on the fly.

You may want to skip it if your rig doesn’t use ARRI 1870 rosette connections, or if you’re looking for a one-piece solution rather than an adjustable connector for a larger ecosystem.

Mini FAQ

Is this extension arm compatible with ARRI 1870 rosettes?

Yes. The description says it uses rosettes on both ends for the ARRI standard 1870, including M6 rosettes with a 31.8 mm diameter.

How is the length adjustment done?

It uses a built-in NATO rail with a central M5 knurled screw that lets you adjust the forward/back distance quickly.

What extension range does it offer?

The length is adjustable within a range of 168 to 255 mm.

Can it attach rosette handles or other rosette devices?

The description says the ARRI-standard rosette can attach rosette handles such as SMALLRIG wooden handle 1941 and rosette handle 1810, and it can also attach the Sony FS5 camcorder base plate 1827 and other rosette devices.