Sigma 72mm WR Ceramic Protection Filter PTC-21 

Protect your lens from unwanted dust, dirt and scratches with the SIGMA Protector Filter. The filter has been designed for everyday use and is completely colourless, so it does not affect colour reproduction.

• Clear Protection Filter
• Prevents Damage to Front Lens Element
• Durable Glass-Ceramic Construction
• Resists Impacts, Dust, Dirt & Scratches
• Water-Resistant Coating Repels Liquids
• Does Not Affect Colour Reproduction
• Revamped Low-Profile Design
• No Vignetting on Sigma Lenses

The ultimate shock-resistant ceramic protector

Featuring "Clear Glass Ceramics," a high-strength material also used in aerospace and other advanced industries. Combining hardness superior to conventional chemically strengthened glass with flexibility greater than sapphire crystal, this flagship protector possesses the ideal properties for lens protection.

Featuring clear glass ceramics

Through a specialised heat treatment that uniformly strengthens the entire material, it achieves a hardness far exceeding that of conventional chemically strengthened glass, while offering greater flexibility than sapphire crystal.

The material's robust structure not only minimises scratches on the front of the lens but also reduces the risk of glass fragments scattering in the unlikely event of damage.

Equipped with WR (Water Repellent) coating

The WR coating, which combines superior water repellency and oil resistance with antistatic properties, repels water droplets, fingerprints, and fine dust. Any smudges can be easily wiped away, providing essential support for shooting in harsh environments.

Completely new design

Internal reflections are suppressed through a redesigned frame surface treatment, minimising any impact on image quality. Furthermore, an optimised design has allowed for a thinner profile in the large-diameter 95mm and 105mm sizes.

Verified compatibility with all Sigma lenses

Compatibility with all Sigma lenses has been fully verified, allowing for shooting without the worry of vignetting, even when using ultra-wide-angle lenses. Despite the slim design, it ensures secure lens cap attachment for peace of mind.