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
600mm Sigma Lens Mirror Eclipse Rear Filter Sigma 150-600mm Sony E Mount Sigma 150 600mm Canon Mount Sigma 150-600mm Nikon F Mount Sigma 60-600mm Sony E Mount Sigma 150-600mm Sony A Mount Sigma 600mm F8 Mirror Lens Sony Mount Sigma 600mm Mirror Lens Mount Blackmagic 4k Nikon Mount Sigma 150 600mm Nikon Mount
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