Vivitar 500mm Preset Instruction Manual page 9

PROPER CARE OF YOUR LENS
Your lens should always be capped to protect it when not in use. Like other precision optics it should never
be simply wiped with tissues since this may damage the surface with dust on the lens. Use a soft brush to
clean the lens surface or polish very gently in a circular motion with high quality, moist lens tissue. Use lens
cleaning uid to moisten the tissue sparingly and only when necessary by applying one or two drops on the
lens tissue. After the lens surface has dried, clean the lens with a dry tissue and blow away other particles
with a soft brush.
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