After every 40 hours of working, use lens wipes or wet cotton swabs to clean the lens and mirrors. Do not rub the mirrors fiercely to prevent damage to the coating on the mirrors. This will keep the unit working properly and prevent permanent damage to your unit.
1. Clean the three reflecting mirrors.
2. The focus lens is inside the lens holder under the third reflecting mirror. Lower down the honeycomb plate or remove it to make room for later procedure. Rotate the lens holder ring clockwise to release and remove the lens holder.
▲ release and remove the lens holder
3. Rotate the silver ring on the lens holder counter-clockwise to take out the focus lens. Use pliers if the ring is too tight to rotate.
4. When putting back the lens, the curved side should face up and the flat side should face down.