Optolong L-eXtreme F2 Dual Band 2 Inch Nebula Filter 51630 providing best opto-mechanical alignment between

Optolong L-eXtreme F2 Dual Band 2 Inch Nebula Filter 51630 providing best opto-mechanical alignment betweenOptolong L eXtreme F2 Dual Band 2 Inch Nebula Filter Optolong L eXtreme F2 is a dual band (500. 7 nm and 656. 28 nm, FWHM=7 nm) narrowband pass filter that meets the requirements for transmission at continuously varying angles. Astronomically characterised spectral lines (OIII, Ha) as the main transmission wavelengths, the OIII and H Alpha nebula emission lines pass accurately at f2 f3. 3 Focal Ratio. Features Together with one shot colour

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