I have shot with the Pentax 55-300mm plm lens several times. Still getting use to the longer focal lengths and the settings to achieve the most creative photo. Switched from Manuel mode to shutter and ISO priority. The results were good but sometimes over exposed. Changed to the manual settings, better image quality. This lens has the best focus system Pentax has produced. I will need more shooting experience to give a more detailed review. So far a thumbs up!