The finished image looks dark or it looks dark in the viewfinder?
If your question is "the image looks dark" in the viewfinder my answer is it's an F4.5 lens so letting less light into the viewfinder and it will look dark. The big difference will be seen if you are coming from lets say a Nikon 50mm F1.8 which is two stops faster then your F4.5.
If it's the finished picture after you taken it I'd say you underexposed the shot.
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