Optolong OIII 6.5nm 31mm Unmounted #11503 [LIMITED QUANTITIES]

Optolong OIII 6.5nm 31mm Unmounted

The Optolong OIII 6.5nm 31mm Unmounted Filter is a high-performance narrowband oxygen-III filter designed for astrophotography under light-polluted or moonlit skies. With a tight 6.5nm passband, it isolates the OIII emission line to dramatically enhance contrast and fine detail in planetary nebulae, supernova remnants, and emission nebulae.

Features and Specs:

• 6.5nm narrowband OIII passband for maximum contrast
• Isolates the 500.7nm oxygen-III emission line
• Reduces light pollution, skyglow, and moonlight interference
• 31mm unmounted format, ideal for filter wheels
• Optimized for CCD and CMOS astrophotography cameras
• High transmission with excellent out-of-band blocking