Top 20 Best Speed Booster Gh4 Reviews & Comparison [Ultimate Guide]

The future of the best speed booster gh4 is here, and we’ve got all the best picks for 2024. We have compiled 3282 reviews from top experts that led us to these 20 devices on the list.

The Best Speed Booster Gh4 Deals This Week: 

Bestseller No. 1
VILTROX EF-M2II 0.71x Speed Booster, EF to Micro 4/3 Focal Reducer Booster Adapter Auto-Focus for GH6 GH5M2 BMPCC 4K GH4 GH5 G100 G95 G85 OM-1 EM-1 E-M1X E-M1 iii E-M5 iii E-M10 iv E-M10 iii
  • Compatibility: Viltrox EF-M2 II is an upgrade version of EF-M2, allowing Canon EF series lenses to be used on M4/3 cameras, such as GH4 GH5 GF6 GF1 GX1 GX7 GX85 E-M5 E-M10 E-M10II E-PL5
  • 0.71x Focal Reducer Converter: focal length is multiplied by 0.71 based on the original (equivalent focal length = focal length x 0.71), which helps enlarge 1 stop aperture
  • AF Functions & Adjustable Aperture: auto focusing function, increasing the lens 1 f-stop and the amount of light into the virtual background, better highlight the theme; adjust the aperture directly from camera to control the lens’ actual aperture
  • Material & Design: bayonets are made of metal with surface plating treatment, being durable and sturdy; inbuilt copper electronic contacts and IS function, making focus precise and clear, with 1/4" thread tripod foot at the bottom, etc
  • USB Firmware Upgrade: Equipped with USB interface, can realize software upgrade. Can perfect new functions of the lens mount adapter and fix bugs according to follow-up upgrades.
Bestseller No. 2
VILTROX EF-M2 II Electronic Auto Focus 0.71x Reducer Speed Booster Lens Mount Adapter for Canon EF Mount Lens to M4/3 MFT Camera Pen-F GH5 GH4 GF9 GX85 E-M5 E-M10 E-M10II E-PL3
  • 【Compatibility】Viltrox EF-M2 II allow Canon EF series lens to be used on M4/3 camera,such as GH5 GH4 GF9 GX85 E-M5 E-M10 E-M10II E-PL3 PEN-F etc.
  • 【0.71x Focal Reducer Booster】 Viltrox EF-M2 II Booster built-in with optical correction group, when using the adapter, the focus of the lens should be multiplied by 0.71, then multiplied by 1.5 (the focus multiplier), is the lens’ actually equivalent focus .
  • 【Auto Focus Function & Aperture Control】 With copper electronic contacts,EF-M2 II will give you fast speed and smooth focusing experience. You can also adjust the aperture of EF lens by control M4/3 camera body.
  • 【EXIF signal transmitting & IS Function】EF-M2 II can transmit the EXIF signals to your camera and display the current information on the screen.( like Aperture, Shutter Speed, Exposure parameters, etc. ),and with Built-in IS function, making your focus much more precise and clear.
  • 【Support Firmware Upgrade】Built-in USB fireware upgrading port, supports USB firmware upgrading and through subsequent upgrade, Viltrox EF-M2 II Booster r can improve the function,and fix bugs.
Bestseller No. 3
Commlite CM-AEF-MFT Booster,0.71x Speed Booster for Canon EF Lens to M4/3 Micro Four Thirds Cameras,Autofocus Lens Adapter for Panasonic GH4 GH5 GH5S GF6 GF1 GX1 GX7,Olympus E-M5 E-M10 E-PL5
  • 【Compatibility】Compatible with EF Series Lens to M4/3 (MFT/Micro Four Third) Mount Cameras. Panasonic: GX1 GX7 GX8 GX80/85 GH1 GH4 GH5 G2 G3 G5 G7 GM1 GF3 AF100 Olympus: E-M1 E-M1 Mark II E-M5 E-M5 Mark II E-M10 PEN-F E-P5 E-PL13. Please check your cameras or lens fits this lens adapter before you purchase.
  • 【0.71x Focal Reducer Booster】CM-AEF-MFT Booster can increase one great of an aperture to blur the background and better highlight the theme. Built-in optical correction group, when using this adapter, the focus of the lens should be shortened by X0.71, and then multiply this data by M4/3 conversion rate, is the approximately M4/3 camera’s actually equivalent focus.
  • 【Auto Focus Function and Aperture Control】CM-AEF-MFT Booster with steady, fast and smooth autofocus, let you easy to shoot in the face of fleeting beauty. You can also adjust the aperture of EF lens by control M4/3 camera body.
  • 【EXIF signal transmitting and IS Function】Cooper gold-plated contacts with great conductivity enhance the EXIF info. Transmission between lens and camera body. CM-AEF-MFT Booster was built-in IS function, making your focus much more precise and clear.
  • 【With USB port firmware update】For adapter firmware update, connect the adapter to the computer with USB cable and execute latest file download from official website. Do not require to attach the adapter to your camera.
Bestseller No. 4
Viltrox NF-M43X Manual Focus 0.71x Reducer Speed Booster Lens Mount Adapter w/Aperture Control for Nikon G D Lens to M4/3 Mirrorless Camera GH5 GH4 GF9 GX85 GX8 E-M5 E-M10 E-PL3 Pen-F BMPCC
  • Viltrox NF-M43X lens adapter allows Nikon G&D mount lens to be used on M4/3 mirrorless camera
  • 4 groups 5 pieces optical glasses, aperture is 1X enlarged for you to blur the background distinct the major subject
  • 0.71X focal length multiplier, APS-C camera can take full frame pictures.
  • 8-stops exact aperture dial
  • Constructed of high-precision aluminum material
Bestseller No. 5
MFT Lens Adapter EF-M2II Auto-Focus Speed-Booster Control Ring for Canon EF Lens to M4/3 Camera GH4 GH5 GF8 GF9 GX8 GX85 E-M5 E-M10 E-M10II E-PL5 Pen-F
  • Compatibility: EF-M2II electronic lens converter allows Canon EF series lenses to be used on micro four thirds (mft) cameras, such as G6 G7 GH3 GF6 GF7 GX7 E-M5II E-PL7 E-PL8 E-PM2 E-P3 E-P5.
  • 0.71x Focal Reducer: focal length is multiplied by 0.71 based on the original (equivalent focal length = focal length x 0.71), which helps enlarge 1 stop aperture.
  • Function: auto focus (AF), EXIF signal transmission, increase the lens 1 f-stop and the amount of light into the virtual background, help to better highlight the theme; adjust the aperture directly via camera to control actual aperture of lens.
  • Material & Design: bayonets are made of high quality metal with surface plating treatment, being durable and robust; optical glasses built in 4 groups / 5 glasses; with 1/4" thread tripod foot at the bottom; firmware can be upgraded via a micro USB port etc.
  • Performance: smooth operating and quick focusing; use gold-plated PIN needle to transmit signal, greatly enhancing its transmission performance; inbuilt copper electronic contacts and IS function, making focus precise and clear.
Bestseller No. 6
EF to Micro 4/3 0.71x Speed Booster, VILTROX EF-M2II EF to M43 Adapter Auto-Focus Focal Reducer Booster for GH6 GH5M2 BMPCC 4K GH4 GH5 G100 G95 G85 OM-1 EM-1 E-M1X E-M1 iii E-M5 iii E-M10 iv E-M10 iii
  • 【Compatibility】Viltrox EF-M2ii Speed Booster is designed to allow Canon EF-mount series lenses to M4/3 cameras, such as GH5 GH4 GF9 GX85 E-M5 E-M10 E-M10II E-PL3 PEN-F etc.
  • 【0.71x Focal Reducer Booster】Focal length is multiplied by 0.71 based on the original (equivalent focal length = focal length x 0.71), which helps enlarge 1 level aperture, increasing the amount of light into the virtual background, can better highlight the theme.
  • 【Multifunctional Lens Adapter】Signal transmission using PIN gold needle, greatly enhanced its transmission performance, real-time preview of photo information on camera, full compatible with Canon lens and camera features, e.g. autofocus, image stabilization, auto aperture adjustment, etc.
  • 【USB upgrade port】the viltrox speed booster supports firmware upgrade via USB port. Through continuous software updates, VILTROX will help users get better shooting experience and fix product bugs.
  • 【Support Lens Stabilization】The ef to micro 4/3 adapter supports the lens image stabilization technology of the lens IS image stabilizer, which effectively eliminates image ghosting and blurring caused by sports shooting or shaking when holding.
Bestseller No. 7
Viltrox EF-M2 II Auto Focus 0.71x Reducer Speed Booster Lens Adapter for Canon EF Mount Lens to Micro Four Thirds M4/3 Camera Panasonic GH4 GH5 GH5S GF6 GX85 GX7 Olympus E-M5 E-M10 E-PL5
  • Compatibility: EF-M2 II allow Canon EF series lens to be used on M4/3 camera,such as GH5 GH4 E-M10 E-PL3 PEN-F
  • 0.71x Focal Reducer Booster: EF-M2 II can increase one great of an aperture to blur the background and better highlight the theme. Built-in optical correction group, when using this adapter, the focus of the lens should be shortened by X0.71, and then multiply this data by M4/3 conversion rate, is the approximately M4/3 camera’s actually equivalent focus.
  • Auto Focus Function & Aperture Control: With copper electronic contacts,EF-M2 II will give you fast speed and smooth focusing experience. You can also adjust the aperture of EF lens by control M4/3 camera body.
  • EXIF signal transmitting & IS Function: EF-M2 II can transmit the EXIF signals to your camera and display the current information on the screen.( like Aperture, Shutter Speed, Exposure parameters, etc. ),and with Built-in IS function, making your focus much more precise and clear.
  • Support firmware upgrade via USB port.With 1/4" Thread Tripod Foot at the Bottom.
Bestseller No. 8
VILTROX EF-M2II 0.71x Speed Booster Auto Focus Focal Reducer Lens Adapter Compatible with Canon EF Lens to M4/3 Cameras GH4 GH5 GF8 GF9 GX8 GX85 E-M5 E-M10 E-M10II E-M1X E-M1 III
  • 【Compatibility】VILTROX EF-M2II mount adapter is suitable for EF/EF-S series lens to be used Micro 4/3 series cameras:such as GH5 GH4 GF9 GX85 E-M5 E-M10 E-M10II E-PL3 PEN-F etc.
  • 【0.71x Focal Reducer Booster】EF-M2II speed booster is equipped with 4 sets of 5 optical lenses,with a focal length multiplied by 0.71 on the original basis;reduce the effective focal length and broaden the shooting range.
  • 【Auto Focus】The EF-M2II adapter can provide you with a fast and smooth focusing experience.Simply pressing the shutter to focus is the foundation of obstacle free creation.
  • 【Dual adjustment aperture mode】Adapter ring aperture adjustment lever and M43 body adjustment.The adapter ring is equipped with an aperture adjustment lever, built-in metal electronic contacts and data chips:it can quickly and effectively adjust the aperture,greatly improved usability
  • 【USB firmware upgrade】VILTROX EF-M2 II speed booster lens adapter has a built-in firmware upgrade interface, which is compatible with new models appearing on the market,makes the adapter ring more applicable
Bestseller No. 9
VILTROX EF-M2 Focal Reducer Speed Booster Adapter Auto-Focus 0.71x for Canon EF Mount Series Lens to M43 Camera GH4 GH5 GF6 GF1 GX1 GX7 E-M5 E-M10 E-PL5,with USB Update Port
  • Compatibility: Allow for Canon EF mount series lens to be used on M4/3 camera. We will glad to help you if you don't know whether this lens adapter ring fits for your cameras and your lens. Focus length multiplier: 0.71x.
  • Support AF Function: Viltrox EF-M2 lens adapter comes with the gold-plating contact, which can help to connect your Canon EF mount series lens to M4/3 Cameras, auto focusing perfectly.
  • Support Aperture Control: Designed with internal aperture motor, you can adjust the aperture from camera end directly to control the lens’ actual aperture.
  • Material & Design: Made of aluminum allo; convenient for installation; powerful and stable;Gold-plating contact, excellent transmitting effect.
  • USB Firmware Upgrade: Equipped with USB interface, can realize software upgrade. Can perfect new functions of the lens mount adapter and fix bugs according to follow-up upgrades.
Bestseller No. 10
VILTROX EF-M2 II Electronic Auto Focus 0.71x Reducer Speed Booster Lens Mount Adapter fits for Canon EF Mount Lens to M4/3 MFT Camera Pen-F GH5 GH4 GF9 GX85 E-M5 E-M10 E-M10II E-PL3
  • 【Compatibility】Viltrox EF-M2 II is an upgrade version of EF-M2, allowing Canon EF series lenses to be used on M4/3 cameras, such as GH4 GH5 GF6 GF1 GX1 GX7 GX85 E-M5 E-M10 E-M10II E-PL5
  • 【0.71x Focal Reducer Booster】 Viltrox EF-M2 II Booster built-in with optical correction group, when using the adapter, the focus of the lens should be multiplied by 0.71, then multiplied by 1.5 (the focus multiplier), is the lens’ actually equivalent focus .
  • 【AF Functions & Adjustable Aperture】 auto focusing function, increasing the lens 1 f-stop and the amount of light into the virtual background, better highlight the theme; adjust the aperture directly from camera to control the lens’ actual aperture
  • 【EXIF signal transmitting & IS Function】EF-M2 II can transmit the EXIF signals to your camera and display the current information on the screen.( like Aperture, Shutter Speed, Exposure parameters, etc. ),and with Built-in IS function, making your focus much more precise and clear.
  • 【Support Firmware Upgrade】Built-in USB fireware upgrading port, supports USB firmware upgrading and through subsequent upgrade, Viltrox EF-M2 II Booster r can improve the function,and fix bugs.

Bottom Line about Speed Booster Gh4

When you purchase speed booster gh4, it’s important to consider whether or not the item will actually serve its purpose. Sometimes we may think that an acquisition is necessary when really there are other options available at a lower cost, which would suffice just as well with no loss in value–reviewing these alternatives beforehand can help avoid wasting money on unnecessary purchases later down the line. 

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