Optolong 1.25" L-Enhance Dual Narrowband Light Pollution Filter (H-Alpha and H-Beta/O-III)

L-eNhance is a dual-band pass filter which has been designed for DSLR (digital SLR), color CMOS and CCD cameras. The convenience and cost effectiveness of this filter allows amateurs to image a rich selection of astronomical images, even in bright, heavily light-polluted areas. Optolong believes the design of our L-eNhance filter is a technical innovation among filters. It effectively isolates the H-Alpha, H-Beta, and Oxygen III nebula emission lines and achieves a maximum transmission of up to 90%. The performance of this filter delivers images that superbly control the impact from light polluted skies. L-eNhance Filter Spectrum Curve: According to the characteristics of celestial body emission lines and feature of light pollution span of spectrum, Optolong specially designed and optimized dual-band L-eNhance filter in order to retain the prominent color of nebula RGB while blocking out most of light pollution. Technical Data: 1. Substrate: B270 2. Thickness: 1.85mm 3. Треак: Т>90%. 4. Blocking range: 300-1000nm 5. Blocking depth: light pollution line blocking >99% 6. Surface quality: 60/40 7. Transmitted Wavefront RMS: 1/4 8. Parallelism (arcsec): 30s Package Includes: OPTOLONG 1.25"L-eNhance Filter*1