Sir, a pre-owned Pentax 16-50/2.8 or the Tamron 17-50/2.8 should serve you well. These lenses are tack sharp with excellent contrast and color. For that occasional tele shot greater than 50 mm get a front attachment high quality 1.7x Auxiliary Tele Lens. Believe me, I use one, and you wouldn't be able to tell the difference even if you pixel peep. This will avoid lens change and the risk of dust entering your camera
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