I bought the ring light, because the presentation in a J ...- Video absolutely convinced. I use the ring light to my SONY A77 with a SIGMA 18-250mm 3.5-6.3 Macro HSM lens. The ring light prevents shadows and facilitates (unlike flash) the difficult manageable uniform illumination. The lens used by me using focal length from 38mm on 62mm thread is available. A shorter focal length will be penalized by the structural condition of the ring light by vignetting. But this is negligible, because I sowiso Scan at telephoto 50-135mm. The additional illumination in daylight and in the living room is perfectly adequate. The use in twilight or bright sunlight I have to try. It's a good uniform "extra light" close-range field up to 50cm. Rechargeable batteries can be used.