Ok, so I got this opteka R72 infrared filter for my nikon d50 and im using the nikon nikkor 50mm F1.8 lens. I can't get the WB right for whatever reason. It's either pinkish or just B&W. What am I doing wrong? What do I need to do to get the sephia tone? So far Ive tried WB'ing on grass using both measure and using a picture reference from an Auto WB picture. Can anyone help me with this please?