OPTOLONG L-extreme 2-inch Ha+OII 7nm Dual Band Pass Filter Compatible with DSLR Cameras/CCD Cameras

Description:
- L-extreme is a dual 7nm bandpass filter which can be used with one-shot color cameras like DSLR's (digital SLR), and monochrome CCD cameras, it is also more suited for fast systems. The convenience and cost effectiveness of this filter allows amateurs to image a rich emission nebulas, even in bright, light pollution skies. It isolates the H-Alpha, and Oxygen III nebula emission lines so that the contrast and signal-to-noise ratio between nebulae were maximized. For people who are living in very light polluted areas, or when the moon is out, the L-extreme will be a good filter.

Specification:
- Sbustrate: B270
- Thickness: 1.85mm
- FWHM: OIII 7nm + Hα 7nm
- Blocking range: 300-1000nm
- Blocking depth: light pollution lines blocked > 99.9%
- Surface quality: 60/40
- Wavefront RMS: λ/4
- Parallelism: 30''
- Size: 2-inch

Package Included:
- 1 x L-extreme Filter