... cameras2.The macro ring light is ideal for forensic, medical, and scientific applications, collectors, insurance, advertising, etc3.Ultra bright LED ... 1PCSAdapter ring (6PCS) 49mm, 52mm, 55mm, 58mm, 62mm, and 67mmTechnical DataEffective Distance: 3cm-100cm(1.1-40inches)Power Rate ... this macro ring LED light, which may affect camera focusing and go wrong. Please use manual focus, when apply this kinds ...