The new Brightin Star 28mm f/2.8 olive green limited edition lens comes with a free Z/RF/E/X/L/GFX lens mount adapter and UV filter if you purchase it directly from the Brightin Star official website:
The lens is also available for sale on Aliexpress, but without the free adapter. Amazon is already sold out.
Check all available Brightin Star lenses here.
Additional information on the Brightin Star 28mm f/2.8:
This new Brightin Star 28mm f/2.8 olive green limited edition lens comes with a free Z-mount adapter
Back in stock: Brightin Star 28mm f/2.8 olive green limited edition lens for Leica M-mount
New and almost sold out: Brightin Star 28mm f/2.8 olive green limited edition lens for Leica M-mount
New Brightin Star 28mm f/2.8 lens for Leica M-mount announced
Via NikonRumors