Digital HT™ filters\nDigital HT™ filters are a state-of-the-art technological breakthrough in multi-coated photo and video filters. Made for the discerning professional and imaging enthusiast, Digital HT™ filters with Hi-Trans® Double-Sided Titanium Multi-Coating surpass even military specifications for hardness and durability.\n\nDigital HT™ - High Transmission - filters offer the strength of a Titanium coating combined with the purest optical quality glass and Tiffen’s Academy-Award-winning ColorCore™ technology. They present unmatched scratch-resistant durability and worry-free cleaning while other coated filters on the market today cautiously suggest delicate, if any, cleaning procedures, in fear of destroying the coating (and thereby the filter).\n\nAnd that’s not all – these High Transmission filters feature a low profile titanium finish ring and anti-reflective black lock ring which sets these filters apart from the rest.\n\nDigital HT™ Polarizing Filters\nPolarizers provide color and contrast enhancement. Reflected light often shows up as whitish glare that washes out color in an image. A Polarizer corrects this problem producing deep, dramatically blue skies. It also removes glare from non-metallic surfaces, such as windows and water. Color saturation in general, especially outdoors, can be improved significantly.\n\nPolarizer/Circular Polarizer\n- Essential general-use outdoor color filter.\n- Produces deeper skies and minimizes reflections in black and white and color photography.\n- Combine a Polarizer with a Red 25 for incredibly dramatic black and white landscapes.\n- Can be rotated to achieve desired effect.\n- Use the Tiffen Polarizer with the enhancing filter for more dramatic effects.\n- Available for Wide Angle lenses.\n\nA Circular Polarizer has the same effect as a Polarizer and is used on cameras with beam splitting metering systems commonly found on auto focus SLR's (for most 35mm auto-focus cameras see your camera manual).\n\nArea of sky most effectively polarized with a Circular Polarizer:\n\nPoint your index finger at the sun. With your thumb extended at a right angle (90°), rotate it around the axis of the index finger. It will point out the band of deepest blue from horizon to horizon.