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A speed booster lens is an adapter you place between the camera and the lens. With it you can combine different brands of cameras and lenses. There’s another advantage too: the glass inside the speed booster shrinks the image slightly so it fits the sensor better. As a bonus, this concentrated image also delivers more light, so you can shoot more easily in dimly lit conditions.
Viltrox EF-M2 Speed Booster (Focal Reducer)
Viltrox EF-EOS M2 Speed Booster (Focal Reducer)
Metabones Canon EF to MFT T Speed Booster Ultra
Metabones T Speed Booster Canon EF to Canon RF Mount adapter
Metabones Nikon G to BMPCC4K Speed Booster ULTRA 0.71x Adapter
Metabones Canon EF- Blackmagic BMPCC 4K T Speed Booster XL (0.64x)
Metabones Canon EF- Blackmagic BMPCC 4K T Speed Booster Ultra (0.71x)
Metabones Canon EF to E-mount T CINE Speed Booster Ultra (0.71x)
Metabones Canon EF or Canon EOS R (RF) T Cine Speed Booster ULTRA 0.71x Adapt
Laowa 0.7x Focal Reducer for PL Probe Lens (PL-R)
Metabones Canon EF to MFT T Speed Booster XL
Laowa 0.7x Focal Reducer for PL Probe Lens (PL-X) - OUTLET
Laowa 0.7x Focal Reducer for EF Probe Lens (EF-L)
Metabones ARRI PL to Nikon Z-mount T CINE Speed Booster ULTRA 0.71x
Metabones ARRI PL an Canon RF-Mount T CINE Speed Booster ULTRA 0.71x