To get right exposure , might need wide aperture f/1.8 , although means might end creating shallow depth field , especially lenses focal length 50mm longer.You also shoot much lower shutter speeds ( e.g. , ½ second , 1 second , slower ) keep mind might need use tripod avoid creating blurry photos result camera moving slightly press shutter button.Does ISO affect sharpness ? ISO affects overall quality image , photographs noise color imperfections ISO increases.Images shot high ISO may appear softer result noise , also low light levels mean less contrast within scene photographing make image seem less crisp.Final Words Camera technology continues progress incredible rate sensors keep getting better capturing images light levels low .