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
Gopro Lens Filter Hero 4 Nikon F Bayonet Mount Lenses Pentax K Bayonet Mount Lenses Leica Bayonet Mount Lenses Pentax Kaf2 Lens Mount Best Sigma Pentax Kaf2 Mount Pentax K Mount To Kaf2 Pentax Kaf2 Bayonet Stainless Steel Mount Pentax Kaf2 K Mount Pentax Kaf2 Mount Lenses
Fuji X Lens Filter Set Recommendation Fujifilm Xt20 Lens Mount Pentax 645 Lens Adapter Sigma Rf Mount For Canon Eos R Eos R Lens Adapter Fuji Xt1 Lens Adapter Nikon 10-30mm Sony A7 Adapter Pentax F Mount Lenses Sony Mdr Rf912rk Adapter Sony E Mount Communication