Most circular ﬁlters are made of brass/aluminum frame, but these kinds of materials are heavy and not ideal under cold weather conditions. Because of that, NiSi created a Titanium Alloy Frame Pro Nano UV Cut -395. It's made of Titanium Alloy Frame with Nano coated optical glass. They feature a lightweight, durability and high deﬁnition design:
- Titanium Alloy Frame is light, hard, anti-corrosive, heat-resisting and with good performance under very low temperatures. The density of Titanium is 4.54g／cm3, it’s almost half of the volume of the same weight steel, and the hardness is twice of aluminum. Its good anti-corrosion ability makes it able to endure strong acid and base. Its melting point is 1942K, about 1000k higher than gold and 500k higher than steel. It’s commonly used in the aerospace industry and missiles.
- Lens Standard Optical Glass Lens standard optical glass H-K9L is high homogeneous with super low impurity and has good physical and chemical performance. It is usually processed to high precision optical elements such as lens, prism, plane mirror, etc.
- UV Cut Nano Coating Nano coating cuts the UV light below 395nm, and effectively avoids the fuzziness situation. It makes sure high transmittance and ultra-low reﬂection on the glass surface. It enables the visible light to come through evenly and control the color balance. Also, there’s a super-strong waterproof coating with anti-scratch ability. It’s easier to remove the dust, ﬁngerprint, water stains, and keep the ﬁlters clean.
- Matte Black inside the frame using electroplating processing to avoid the reﬂection of light. On the outer side of the ring, the turning by diamond cutters shows the original color of Titanium. It looks great and is elegant.
- Ultra-High Deﬁnition Optical glass is after precision annealing which effectively eliminates the stress. Each piece of glass passes strictly HD test and reaches the standard for HD photograph with all kinds of lenses and there is no loss of image quality. Black matte paint is all around the glass edge to avoid the inﬂuence caused by stray light.
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