Sapphire UV Filter
With testing and developing for many years, STC represents the world premiere “Sapphire UV Filter” which is of the minimum optical path difference that reduces diffraction in the glass therefore reduces flare and ghost. STC adopted the world thinnest single-crystal semiconductor glass, its structure by nature made the filter as strong as the chemical-strengthen 800Mpa glass. It will provide you with most trusty protection on both lens and images.
On the glass STC precisely polish and grind to make the surface flatness less than 4Å (also known as the wave is within ±4cm on 100km diameter lake.) The optical coating technology corrects color cast by suppressing ultraviolet light and infrared light, and the transmittance of visible light 400nm-650nm is 99.5%. Carbon coated glass rim that reduces reflection in the glass and the duplex coating that make the filter handy applied to all STC filter series.
The frame of Sapphire applies duplex vibration reduction design that absorbs the impact on the glass. Also the aluminum material absorbs the impact on the ring and stretch without transferring to you precious lens. All the details in CNC knurling, thread, thickness, Teflon and matte black anodizing are to make the filter almost no vignetting, fits the original lens cap, easy to install and to remove, reduce the reflection to help you get more perfect images.
|Available Size||62mm, 67mm, 72mm, 77mm, 82mm|
|Material||Taiwan Single-crystal Silicon|
|Thickness||0.7mm Glass、2.5mm Rim|
|Depth of CS||800Mpa|
|Water Drop Contact Angle||> 110°|