This lens performs well in good light, although its performance in dark conditions is limited. Cameras that fit everyone have excellent high ISO capabilities. My RP sample, 600 ISO 1600 1/500, is slightly clipped at about 17 feet. The image was captured in RAW format and processed to the best of my knowledge (I'm not an expert). This lens requires the user to relearn some of the things that guided their previous methods, but it can deliver decent results for a fraction of the cost of larger lenses.