The 40.5mm Ultraviolet (UV) Filter is a wise initial investment. It helps protect your valuable investment from dust, moisture and scratches, which can lead to costly repairs.
UV filters are excellent general purpose filters since they will not only protect your front element from airborne contaminants as well as fingerprints but also help you get better images at high altitude and while on the water. Using this filter will diminish the bluish cast caused by the various atmospheric factors, yet, it will not have an effect on the color balance of your shot. No increase in exposure is required.