Hey, this is my first thread or post of any sort on amateur photographer so i'll dive right into it. I have a Pentax KM with the standard 18-55mm lens. Really i've got two questions here, first of all would the protector linked here: http://www.digitaltoyshop.co.uk/Water_Repellent_Protector_Filter_Pentax_K-m_t1540_5939 be of any use? How does such a thing mount? Also what are the best rechargeable AA batteries (and charger for those batteries) for the camera? Assuming price isn't a concern. Thanks.