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
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Mft Lens Mount Adapter Adapter Canon Fd Sony E-mount Best Ef Mount Pancake Lens Mobius Remote Lens Mount Metabones Nikon G To M4 3 Adapter Nikon V-t Photo Adapter Nikon F Mount Back Cap Vivitar 85 205mm F3 8 Nikon Mount Sony A68 Lense Mount Sony Alpha Sel18200 E-mount 18-200mm F3.5-6.3 Oss