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Metabones Speed Booster Ultra 0.71x Adapter for Leica R-Mount Lens to Micro Four Thirds-Mount Camera

BH #MEBSPLRM43BM • MFR #MB_SPLR-M43-BM3
Metabones
Metabones Speed Booster Ultra 0.71x Adapter for Leica R-Mount Lens to Micro Four Thirds-Mount Camera
Key Features
  • Leica R Lens to Micro 4/3 Body
  • Full-Frame Lens to Micro 4/3 Camera Body
  • 0.71x Micro 4/3 Crop Factor Compensation
  • 1-Stop Increase in Lens Apertures
The Speed Booster Ultra 0.71x Adapter for Leica R-Mount Lens to Micro Four Thirds-Mount Camera from Metabones allows a Leica R-mount lens to be mounted onto a Micro Four Thirds-mount camera. While doing so, the adapter's optics help to maximize the connected lens's apparent angle of view while providing a 1-stop increase for the camera over the lens's aperture range.
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Metabones MB_SPLR-M43-BM3 Overview

The Speed Booster Ultra 0.71x Adapter for Leica R-Mount Lens to Micro Four Thirds-Mount Camera from Metabones allows a Leica R-mount lens to be mounted onto a Micro Four Thirds-mount camera. While doing so, the adapter's optics help to maximize the connected lens's apparent angle of view while providing a 1-stop increase for the camera over the lens's aperture range.

If a lens intended for 35mm film or similarly-sized full-frame camera sensors is connected to a camera with a Micro Four Thirds-sized sensor, it would project an image larger than the Micro Four Thirds sensor was built to accept. Able to capture only the center portion of the projected image, the effective angle of view of the lens would be narrowed, creating an in-camera "crop factor." The Speed Booster Ultra 0.71x Adapter for Leica R-Mount Lens to Micro Four Thirds-Mount Camera condenses the light from a lens designed for 35mm film or "full frame" camera sensors and projects it onto a Micro Four Thirds sensor. This allows a Micro Four Thirds sensor to utilize more of the light gathered by a connected lens, which effectively reduces the crop factor while making available to the sensor an additional 1 stop of light for each of the lens's f/stop settings.

This adapter is constructed from aluminum alloy for durability while minimizing weight and its mounting rings are made with brass to further prevent wear-and-tear. Inside are five lens elements in four groups that are designed to provide optical clarity as well as color fidelity, and a detachable tripod foot is included that features 1/4"-20 threads as well as compatibility with Arca-Swiss tripod heads.

The Speed Booster Ultra 0.71x Adapter for Leica R-Mount Lens to Micro Four Thirds-Mount Camera does not support electronic communication between an attached camera and lens. To help determine the amount of light that enters a Micro Four Thirds-mount camera when using this adapter and a Contax/Yashica-mount lens, users should use the aperture ring found on the lens.

  • Allows a full-frame Leica R-mount lens to be used with a Micro Four Thirds-mount camera
  • Maximizes apparent angle of view of combined camera and lens
  • Provides a 1-stop increase for the camera over the lens's aperture range
  • Five lens elements in four groups for optical clarity as well as color fidelity
  • Detachable, Arca-Swiss compatible tripod foot with 3/8" threads
  • Aluminum alloy components for weight reduction
  • Brass mounting rings prevent wear-and-tear
  • Locking mechanism for secure attachment of lens with push-button release

Metabones MB_SPLR-M43-BM3 Specs

Adapter
Camera MountMicro Four Thirds
Lens MountLeica R
Magnification0.71x
Optical Design5 Elements in 4 Groups
Packaging Info
Package Weight0.75 lb
Box Dimensions (LxWxH)4.7 x 4.2 x 2.3"

Metabones MB_SPLR-M43-BM3 Reviews

Outstanding

By Mark
Rated 5 out of 5
Date: 2022-04-27

Adapting a full frame Olympus Auto-Macro 50mm f/2 to an EM1ii it works spectacularly well. The factory adjustment for infinity has to be rotated almost 2/3 of a turn to dial this lens in correctly, but once done the result is amazing - it actually outperforms the native micro 4/3 Olympus 60 mm f/2.8 macro!

Works super well.

By Ethan
Rated 5 out of 5
Date: 2022-01-31

Was debating over this and the Viltrox version for my BMPCC 4K/Sigma 18-35mm combo. Heard that the Viltrox one is not that sturdy, so I went for Metabones. It works great, and it super sturdy.

It really works

By Harold
Rated 5 out of 5
Date: 2021-10-19

Rather than sell my Canon lenses, they adapt to my Olympus with an added f-stop. Do read the directions! At first I thought that it would not focus. You have to calibrate it. Then, my 100-400 is now 200-800 for a fraction of the cost of buying another lens.

Works well, solid adapter!

By Mikki
Rated 4 out of 5
Date: 2021-08-17

It's great to be able to use my Nikon lenses with the Blackmagic Pocket Cinema Camera 4k.

A must have for your kit!

By Danny
Rated 5 out of 5
Date: 2021-04-23

Ive wanted one for so long. Quality build. Love the storage case it comes with and in. Very protective yet compact.

Perfect fit

By Paapa
Rated 4 out of 5
Date: 2021-04-21

This fits perfectly with my BMPCC 4k, and my sigma 18-35mm lens. I originally hesitated buying it cause of the price, but the clarity and durability has made it worth it for me. Highly recommended for bmpcc 4k owners

The optics work, the mount design... not so much

By Ed
Rated 3 out of 5
Date: 2022-03-15

Optically, this adapter does exactly what it advertises. There are two design flaws I want to point out, and I apologize if I get some terms incorrect. I will do my best to explain. 1) The inside of the adapter is a bit too thick. The aperture lever on some MD lenses would get stuck on the inside keeping the aperture wide open. Levers that were flat weren't an issue, rounded levers were usually the issue and I had to file them down to get the aperture to work with this adapter. 2) The little pin/arm that locks the mount in place is very soft. And I think a tad bit too wide for certain MD mounts that were off-brand/non-minolta and it would not set into the notch. This would cause the arm to bend (which it does quite easily) and no longer hold the lens. I would have to disassemble the adapter and carefully bend the arm/lever so that it would stick out enough to catch the notch. I also had to remove the arm/lever and file it down a touch to fit into all notches on all my MD mount lenses. If I had one or two MD lenses and never swapped much it would be less of an issue. But I am a bit of a collector and fanatic and have quite a few old lenses that I actually use a lot. I am nervous that at some point that little locking arm/lever is going to snap. Optically this is a fantastic adapter but I am tired of fighting the design and have decided maybe it's best to sell it and just stick with the $15 adapters. I have an FD version of this adapter as well, it has been great!

Expensive, but works great.

By Aaron
Rated 3 out of 5
Date: 2022-02-22

If you once shot Canon EF lenses, and since converted to a m43 system, this unit really opens up your available list of lenses! BUT I urge you to throw a quick search up on your second hand options before you drop the money for this. Lots of people seem to buy it new, and realize they don't need it / don't use it. Save your $$.

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question

Does this reduce the focal length of the lens?
Asked by: Anonymous
Please take into account the crop factor of the camera also! For a camera with a 2x crop factor such as the GH5, a 50mm Canon FD lens would have the focal length of 100mm, you THEN multiply that by the adapter's magnification factor (in this case 0.71x), to get 71mm.
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