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My camera taking dull images even i set maximum resolution. How can i solve this problem? and how to clean my camera lence?

the resolution have no impact on the sharpness of the picture. could you upload a sample image? are all images “dull”? cleaning the lens inside or outside?? a dlsr works different than a compact camera - one of the main differences of the picture is the blur - or better - the bokeh (click). what lens are you using? maybe the lens has a front- or backfocus! you can use the fosus test chart to find out if your lens has this issue: CLICK

try a different lens to see if the problem is with the lens or the camera. It is most likely the lens.