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SmallRig F40 mini Follow Focus + Mini Matte Box Kit

BH #SM3010C3575K (B&H Kit)
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SmallRig F40 mini Follow Focus + Mini Matte Box Kit
Key Features
  • Lightweight, Compact Follow Focus
  • Compact Matte Box Weighing Only 3.8 oz
  • 3.94" 15mm Rod & Rod Clamp
  • Carbon Fiber Box & Top Flag
Accessorize your camera's lens with the SmallRig F40 mini Follow Focus + Mini Matte Box Kit put together by B&H. This kit includes the F40 mini follow focus and a lite mini matte box. The follow focus includes a 15mm rod clamp and rod, A/B hard stops, marking ring, gear ring, and anti-slip knob. The matte box includes multiple adapter rings and a 4 x 5.65" filter tray; it accepts circular filters and is made from carbon fiber.
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Kit Contains:

From Manufacturer

Accessorize your camera's lens with the SmallRig F40 mini Follow Focus + Mini Matte Box Kit put together by B&H. This kit includes the F40 mini follow focus and a lite mini matte box. The follow focus includes a 15mm rod clamp and rod, A/B hard stops, marking ring, gear ring, and anti-slip knob. The matte box includes multiple adapter rings and a 4 x 5.65" filter tray; it accepts circular filters and is made from carbon fiber.

SmallRig F40 mini Follow Focus

The F40 mini Follow Focus from SmallRig is an adjustable, manual follow focus that mounts to the left side of your lens. It features a fluid focus knob that ensures smooth focus control and precision with its adjustable A/B hard stops and is easily mounted using the included 15mm rod clamp with NATO rail. It also includes a 3.9" 15mm rod, a 0.8 MOD/43T gear, and an adjustable, belt-style focus gear ring.

The anti-slip and anti-sweat focus knob prevents moisture build-up and provides comfortable dampening control. The belt-style lens gear ring wraps around the lens, and different-size gear rings with different gear teeth measurements may be utilized. A replaceable marking ring is included in the package, as well as a hard carry case for the follow focus components.

Compatibility
  • Standard 15mm rod
  • NATO rail accessories
  • Standard 0.8 MOD lens and focus gear rings
  • SmallRig 0.8 MOD / 65T gear 3200
  • SmallRig 0.8 MOD / 43T gear
  • SmallRig 0.8 MOD / 38T gear 3285
  • SmallRig Φ62.5-64.5 Seamless Focus Gear Ring 3291
  • SmallRig Φ66-68 Seamless Focus Gear Ring 3292
  • SmallRig Φ72-74 Seamless Focus Gear Ring 3293
  • SmallRig Φ75-77 Seamless Focus Gear Ring 3294
  • SmallRig Φ78-80 Seamless Focus Gear Ring 3295
  • SmallRig Φ81-83 Seamless Focus Gear Ring 3296
  • SmallRig Tie-style focus gear ring supports lens diameter up to Φ114mm
  • SmallRig Standard joystick and focus whip
SmallRig Mini Matte Box Lite

Add an even lighter and more compact matte box to your rig with the Mini Matte Box Lite from SmallRig. The clamp-on matte box weighs only 3.8 oz and fits small mirrorless or DSLR cameras. It is made from durable but lightweight carbon fiber material, as well as plastic and aluminum components. It accepts multiple 4 x 5.65" filters and comes with one filter tray and four adapter rings to attach the matte box to a variety of lenses. The maximum load capacity of the matte box is 2.2 lb.

The included carbon fiber top flag helps block veiling glare or bright reflections from striking your lens, and it can be folded down to cover the front of the matte box and provide protection to the front of your lens. The matte box features a 95mm diameter opening, and the included 67, 72, 77, and 82mm threaded adapter rings allow you to use the matte box with lenses of different sizes and diameters. A separately available adapter ring kit can be used for additional lens sizes, and it also accepts circular filters up to a 92.5mm diameter.

Key Features
Made from durable and lightweight carbon fiber, plastic, and aluminum
The matte box has a 95mm opening and attaches directly to the front of a lens using the included 82, 77, 72, and 67mm adapter rings
Multiple 4 x 5.65" filters can be added to the front of the matte box with filter trays (one is included)
A circular filter up to 92.5mm can also be added, along with a filter tray
A carbon fiber top flag is included to block unwanted glare
Maximum load capacity of 2.2 lb
Optional adapter ring set with 52, 55, 58, 62, and 86mm rings (SmallRig 3383) is available for additional lenses
Kit Contains:

SmallRig F40 mini Follow Focus

General
Included Drive Gear
0.8 MOD 43 Teeth (Detachable)
Rod Standard
15 mm Single Rod (Slide-On)
Number of Sides
Single-Sided
Built-In Hardstops
2, Removable
Witness/Index Mark
No
Marking Disk
Yes
Switchable Handwheel Speed
No
Gear Material
ABS, Aluminum
Handwheel Accessory Port
No
Dimensions
4.7 x 3.4 x 2.4" / 120.5 x 87 x 60 mm
Weight
6.9 oz / 195 g
Packaging Info
Package Weight
1.105 lb
Box Dimensions (LxWxH)
7.6 x 5 x 3"

SmallRig F40 Reviews

Not for high torque use

By Aria
Rated 1 out of 5
Date: 2026-03-25

I guess I got lucky based on these other reviews. My unit immediately developed play within weeks of me using it, due to the mating surface of the handwheel to the rotating metal shaft being made of thin, flexible plastic. High torque will cause this piece to flex and weaken, eventually allowing a mm or two of rotational play in the mechanism. I can see this working long term with extremely low resistance lenses only, such as stills glass. Any higher torque application will eventually wear & damage this part.

Works well

By Wayne
Rated 5 out of 5
Date: 2025-03-03

Every Small rig product works well and is made well. The friction wheel does not work with my sigma lenses. But the provided Adjustable gear works very well. I tried the rubber gear belts made to be left on the lens. they did nor work at all. the gear teeth are too soft.

See any errors on this page?

Does anyone know if the nato rail that comes with ...

Does anyone know if the nato rail that comes with this follow focus can be used with the RED Komodo 6k top mount holes?
Asked by: Frank
The mount that comes with the SmallRig F40 mini Follow Focus is designed for Smallrig cages. The top mounting points on the RED Komodo are 1/4 20. And the included 15 mm mount is 1/420, so it should work with your camera.
Answered by: Chris H
Date published: 2024-12-05

Does this fit the bolex 16 ,rex1-2 model?

Does this fit the bolex 16 ,rex1-2 model?
Asked by: Abdulrahman
The SmallRig F40 mini Follow Focus is designed to be a universal follow focus that can be used when mounted on 15mm rods with cinema, mirrorless or DSLR cameras. Considering the design of the Bolex 16 and the age of the camera, the follow focus would not be compatible.
Answered by: Tim Z
Date published: 2024-06-05

Is this compatible with Fujinon 18-55 and ...

Is this compatible with Fujinon 18-55 and 50mm-135mm zoom lenses??
Asked by: Jim
The SmallRig F40 mini Follow Focus comes with a 0.8 MOD / 43T Gear that will mesh with the focus, zoom, and aperture rings of any cine lens such as the Fujinon cine lenses.
Answered by: Dennis L
Date published: 2025-09-21

Can you recommend a speed crank that work well ...

Can you recommend a speed crank that work well with this? Some reviews of speedcranks on BH (e.g., Cavision) complain of bad fit
Asked by: Paul
The Redrock Micro microSpeedCrank (BH #RE3019FFC) will work well with the SmallRig F40 mini Follow Focus.
Answered by: Paige K
Date published: 2025-08-28

Does this come with the hard stop screws?

Does this come with the hard stop screws?
Asked by: Simon
Yes, the SmallRig F40 mini Follow Focus comes with the A/B hard stop screws.
Answered by: Jonathan S
Date published: 2024-03-28

Is the direction of the focus gear reversible? ie:

Is the direction of the focus gear reversible? ie: can it be used with manual Nikon glass without changing wheel direction?
Asked by: nate
Yes, the SmallRig F40 mini Follow Focus wheel can be moved in either direction with no alteration to the unit.
Answered by: Jonathan S
Date published: 2026-03-17

Does this kit come with the case shown in the ...

Does this kit come with the case shown in the demo video above? The description just says "storage bag."
Asked by: Joshua
Yes, the SmallRig F40 mini Follow Focus includes a hard case as shown in the product video.
Answered by: Marisa P
Date published: 2024-05-30

Whats the difference between this Whats the ...

Whats the difference between this Whats the difference between this and SmallRig Follow Focus 3010B? Is this better?
Asked by: Rohit
The SmallRig F40 mini Follow Focus is the updated version of the SmallRig Follow Focus 3010B, and as such, the F40 has improved mechanics and a slightly different design.
Answered by: Paige K
Date published: 2024-01-22
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