CamDesign 72MM White Balance Lens Cap + CamDesign Wristband Lens Focus Ring Create custom white balance settings almost anywhere Protects your lens from dust and damage It allows digital photographers to quickly and easily set an accurate custom white balance Using this white balance filter to set a custom white balance results in consistently balanced color and eliminates many of the yellow, red and blue color casts commonly seen in digital photography This white balance filter is individually assembled, calibrated and certified for neutrality in the visible spectrum, and for 18% light transmission