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.
Such lenses will extend beyond infinity and may touch 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.