Hitech Formatt 127mm Skylight 1A Optical Glass Filter with Schott-Desag B270 Crown

Hitech Formatt 127mm Skylight 1A Optical Glass Filter with Schott-Desag B270 Crown | BF 127-UVSKY1A

That unmistakable warm tilt?a subtle 1A skylight tint that knocks back the blue in open shade or on overcast days. This Hitech Formatt filter mounts cleanly on a 127mm front thread, and it’s built around Schott-Desag B270 crown optical glass, the same substrate used in precision scientific instruments. No cheap resin here; just a flat, hard, water-white disc that won’t soften your sharpness.

• Optical glass construction: Schott-Desag B270 crown delivers true clarity and consistent color transmission, not the haze or flaring you get from lower-grade materials.
• Skylight 1A warm-up: A very faint pink cast reduces the harsh blue cast from sky reflection on snow, water, or distant landscapes?without shifting your entire white balance.
• Front thread protector: Leave it on as a sacrificial layer against dust, spray, and everyday knocks; when it gets scratched you replace a filter, not your lens.
• 127mm size: Larger than typical step-up cine or telephoto housings; this is for serious long glass or ultra-wide front elements that demand a big clear aperture.

Sure, you can leave this on full-time as a general UV/skylight guard. But the 1A color shift really earns its keep when you shoot open shade portraits or alpine landscapes where the blue channels run wild. Ideal for the shooter who needs honest glass on a big diameter thread and prefers subtle optical correction over gimmicks.