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Metabones N/F-MFT mount Speed Booster XL 0.64X for Nikon F-Mount, G Type Lens to MFT Body (MB_SPNFG-M43-BM1)

Model #391780
  • $112.00

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New in box complete with manufacturer's USA warranty. Not previously owned or used.
Essentially new with no signs of use. “Open box.” In manufacturer's packaging with original accessories and instructions. 180-day warranty.
Barely used with virtually no traces of wear. Only the closest inspections will reveal slight use. Lens glass could contain light dust or debris. Excellent picture quality. Accessories usually not included, unless noted in listing. 180-day warranty.
Lightly used with limited signs of wear. Exceptionally nice but may have slight wear on finish visible. Lens glass could contain light dust or debris. Excellent picture quality. Accessories usually not included, unless noted in listing. 180-day warranty.
Noticeably used with average signs of wear. Shows moderate wear for the age of the item, with the possibility of blemishes and/or minimal dings. Lens glass may have average dust and zoom/focus ring tension may have slight looseness or tightness overall, but will not affect picture quality. Accessories usually not included, unless noted in listing. 180-day warranty.
Frequently used with above-average wear. May have dents, dings, or finish loss. Lens glass may have small scratches, dust, and blemishes, and zoom/focus ring tension may have moderate looseness or tightness overall, but should not affect picture quality. Accessories usually not included, unless noted in listing. 180-day warranty.
Heavily used with extensive visible wear. Equipment is rough, with multiple impressions in the finish, excessive finish loss and brassing. Glass will have marks, fungus and/or heavy/cloudy haze which could affect picture quality. Accessories usually not included, unless noted in listing. Not covered under KEH warranty.
Non-functional or damaged. Equipment will not work. Usable for parts. Not covered under KEH warranty and non-returnable.
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Metabones Speed Booster XL turns Nikon F glass into faster MFT lenses

The Speed Booster XL 0.64x sits at the top of Metabones' focal reducer lineup for Micro Four Thirds bodies. Where a standard adapter simply mounts one system's lens to another body, this one contains an optical element that concentrates the image circle from Nikon F-mount G-type glass onto the smaller MFT sensor. The result is a 0.64x focal length reduction factor and an aperture gain of approximately 1.33 stops, so a Nikon 50mm f/1.4 becomes roughly a 32mm f/1.0 equivalent on your MFT body.

That aperture gain is the real story here. MFT shooters have always traded light-gathering capability for the system's compact size and long lens reach. The Speed Booster XL partially reverses that trade. G-type Nikon lenses, which have no aperture ring and require electronic control, are fully supported, aperture is managed through the MFT body's interface. The optical design is purpose-built for the 0.64x reduction ratio, not an one-size-fits-all focal reducer, which matters for image quality at the corners when shooting wide open.

For anyone sitting on a collection of Nikon F glass who has moved to MFT, this adapter makes that investment genuinely useful than just technically compatible.

Who It's For

Filmmakers shooting on MFT cameras like the Panasonic GH or Blackmagic Pocket series will find the 1.33-stop aperture gain meaningful for low-light work without stepping up to a larger sensor body. Documentary and event photographers who carry MFT systems for weight savings but own Nikon F primes can run that glass at a wider effective field of view. Studio shooters with a drawer full of Nikon G-type zooms get a faster, shorter equivalent without buying new native lenses. Travel photographers who want a compact MFT kit but need access to a broader Nikon F lens catalog will appreciate the 0.64x reduction pulling those lenses back toward more natural focal lengths.

Key Features

  • Nikon F-Mount G-Type to Micro Four Thirds mount conversion
  • 0.64x focal length reduction factor
  • 1.33-stop aperture gain with optical elements
  • Electronic aperture control via MFT body interface
  • Speed Booster XL optical design for corner image quality
  • Passive manual focus adapter

FAQ

What's the aperture gain when I use a Nikon lens on this adapter?
The Speed Booster XL increases maximum aperture by approximately 1.33 stops. A Nikon 50mm f/1.4 becomes roughly 32mm f/1.0 equivalent on your MFT body.
Does this work with all Nikon F-mount lenses?
It's designed for Nikon F-Mount G-Type lenses specifically, which have no aperture ring. Aperture is controlled electronically through your MFT body's interface.
What's the focal length reduction factor?
The 0.64x magnification factor reduces focal lengths by that ratio. A 50mm Nikon lens becomes approximately 32mm when mounted to your MFT body.
Will autofocus work?
No - this is a passive optical adapter. You'll need to focus manually on your MFT body.
How does this differ from a standard lens adapter?
This contains an optical element that concentrates the image circle from Nikon glass onto the smaller MFT sensor, giving you the aperture gain and focal length reduction. A standard adapter just mounts one system to another without optical correction.
Can I use older Nikon lenses with an aperture ring?
No. This adapter is specified for G-Type Nikon lenses, which control aperture electronically. Pre-G lenses with aperture rings are not compatible.
SpecificationValue
MountNikon F to Micro Four Thirds
Mount InputNikon F-Mount (G-Type)
Mount OutputMicro Four Thirds (MFT)
Magnification Factor0.64x

This description was generated using AI based on KEH's internal product standards, product expertise, and knowing what customers care about most. While we strive for accuracy, details may vary by individual item.

Brand Name Metabones
Lens Mount Micro Four Thirds without electronic contacts