Optolong 1.25" 10mm Dual Threaded L-Enhance Dual Narrowband Light Pollution Filter (H-Alpha and H-Beta/O-III)
Brand: Optolong

This filter is identical to the 1.8mm Optolong L-eNhance filter, with one difference - it is threaded on both sides of the filter, allowing you to thread the filter into the imaging train like an adapter ring or extension tube and connect it to the next component in the train. It is 7.6mm thick excluding threads and 10mm with threads. If using in a filter wheel or filter drawer, ensure that the system can accommodate 10mm filters. The relentless spread of urbanization and its associated light pollution have become a growing problem for all amateurs and astro photographers. The current solutions to the problem can be expensive and might include the purchase of a monochrome camera, several types of narrowband filters and a filter wheel. L-eNhance provides an economical and practical solution for amateurs. It is a dual band-pass narrowband filter which has been designed for DSLR (digital SLR), color CMOS and CCD Astrophotography 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. According to the characteristics of celestial body emission lines and the light pollution 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. Substrate: B270 Thickness: 1.85mm Tpeak: T>90% Blocking range: 300-1000nm Blocking depth: Light pollution line blocking >99% Surface quality: 60/40 Transmitted Wavefront RMS: λ/4 Parallelism (arcsec): 30s

Excellent Light Pollution Suppression. Threaded on both sides of the filter
Image in Urban Areas and Under Moonlight
Take One-Shot Color Images with Superior Color Fidelity
Narrowband Filtering Passes Hydrogen-Alpha, Hydrogen-Beta and Oxygen-III
DUAL THREADED: Can be Used Threaded to 2" Camera Nose Piece/Adapter Rings/In-Line etc. For Filter Drawer or Filter Wheels Verify They Support 10mm 2" Filters As They May Be Too Thick