<p>I have a nikon D3100 but I wasn’t happy about the iso performance. Therefore I bought a second hand D610. My only lenses are the 18-105 and the 55-300, they are dx lenses. I don’t always use high iso, so its not necessary to use the D610 as my primary camera. That said, I wouldn’t mind ditching the D3100 altogether.<br /><br />What stops me is that Ive read that the picture quality on the D610 is worse with the 18-105 than on the D3100 because the sensor is bigger, and the higher megapixel count shows the ’flaws’ in cheap lenses. However, if I downsize the 24MP of the D610, will that change anything?<br /><br />I mean, will pictures look better on the D610 after downsizing, or will I be better off to use the D3100 when I don’t need the high iso capabilities?</p>