kfconcept
There are two types of FD mounts
FD/FL Breech-Mount (with a silver ring, you need to rotate the silver ring when attachment and removal), breech-lock mounts are identified by the silver ring
New-FD Bayonet Mount, bayonet mounts are identified by a red dot next to the lens release button
Here are the steps to install breech-mount version
Operating the adapter
Laowa Leica M Mount Laowa L Mount Lens Laowa Probe Lens E Mount Laowa Probe Lens Pl Mount Laowa Nikon F Mount Laowa Nikon Z Mount Laowa Sony E Mount Laowa Lens E Mount Laowa Lens With Anamorphic Adapter Sony Alpha Vs Fe Mount
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