B+W 43mm T-Pro 007M Clear Filter with No Filter Effect or Light Loss which will also protect your lens investment. They can remain in front of the lens permanently as they are color-neutral, highly transparent and, thanks to the B+W Mrc Nano coating, have an extremely low reflection.Active photography puts a great demand on both cameras and lenses. It makes sense therefore to use a B+W filter to protect your delicate front lens element against the elements such as blowing sand and dust, fingerprints and splashing water. B+W filters not only cost just a fraction of the price of a new lens but they are also easier to clean.They can remain in front of the lens permanently as they are absolutely color-neutral, highly transparent and, thanks to the B+W Mrc nano-coating, have an extremely low reflection. The optical information remains unaffected when it reaches the image sensor (or film).