Such lenses will then focus beyond infinity and may contact the protective filter. A spacer ring (made e.g. of decopperized FR3 1.5mm circuit board) can be added between the K-mount lens body and its bayonet plate.
Lenses that can extend past infinity can contact the protective filter. A spacer ring, made from a material like FR3 circuit board (decopperized), can be inserted between the lens's body and its bayonet mount.