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Venes B4-M4/3, Lens Adapter Suit For B4 2/3" For Canon For Fujinon ENG Lens to M4/3 Camera - AliExpress
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B4-mount - Wikipedia
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Shooting with B4 mount Video lenses on large sensor cameras.
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B4 TV Lens to Sony Alpha E-Mount Camera Body Adapter – Fotodiox, Inc. USA
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ARRI B4 Lens Mount - Videolinea system
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B4-mount - Wikipedia
LA-EB1
Blackmagic Design URSA Mini Pro B4 Mount – Thomann United States
