The Intova 52mm Red Filter For Sport Pro Camera is an accessory for the Sport Pro digital camera that restores the red color spectrum to your underwater images. The issue with the color red is that it carries only 15-20' (4.6 - 6.1 m) beneath the water's surface. At greater depths than this, it becomes washed out, turning into a muted shade of blue or grey. To ensure your images retain vibrancy and color fidelity, use this 52mm slip-on red filter.