The Optolong L-Enhance EOS Clip Filter (Optolong, SKU: L-ENHANCE-EOS-CLIP) is a dual narrowband interferential filter designed as a practical and cost-effective solution to light pollution in astrophotography. It is intended for use with DSLR cameras and color CMOS sensors, allowing efficient Deep Sky imaging even under heavily light-polluted skies.

Key features

• dual narrowband interferential filter
• isolation of H-alpha, H-beta and O-III emission lines
• maximum transmission up to 90%
• bandpass width: 10 nm
• effective suppression of light pollution
• EOS Clip format for DSLR cameras

Main use and performance

• designed for DSLR cameras
• suitable for color CMOS cameras and monochrome CCD cameras
• increased contrast for emission nebulae
• enables imaging of a wide range of astronomical objects under light-polluted skies
• reduced post-processing time

Technical specifications

• substrate material: B270
• thickness: 1.85 mm
• peak transmission (Tpeak): T>90%
• blocking range: 300–1000 nm
• light pollution line blocking efficiency: >99%
• surface quality: 60/40
• transmitted wavefront RMS: λ/4
• parallelism: 30 arcseconds
• spectral curve: provisional image, subject to change