Optolong
L-eXtreme Filter 2"
L-eXtreme Filter 2"
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A dual band filter for Astrophotography
L-eXtreme is a two 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 rich emission nebula, 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 are maximized. For people who are living in very light polluted areas, or when the moon is out, the L-eXtreme will be a great filter.
The advantage of the L-eXtreme filter is that there is no transmission between the H-beta and OIII lines, as there is no nebula emission lines there. In this case, it isn't letting light pollution come through so that maximize nebulas signal and make the sky background darker while imaging. The L-eXtreme filter should better isolate the emission lines only and better protect from light pollution
Unlike the Optolong L-eNhance filter which is a tri-band (transmits Hb, Ha, and OIII), the L-eXtreme filter is dual band that passes Ha and OIII emission lines.
How to read the chart?
- The horizontal axis is the Wavelength in Nanometers(nm).
- The vertical axis is transmission in %.
- The red line shows the line of H-a. Green line shows the emission of OIII. The artifical emission lines are shown in orange.
