The Optolong L-Extreme F is a is a dual-band (500.7 nm and 656.28 nm, FWHM=7 nm) narrowband pass filter. It is designed to work with fast imaging systems with focal ratios of f/2 – f/3.6 such as the Celestron RASA as well as imaging accessories such as the Hyperstar.
Narrowband filters reduce the effects of light pollution by blocking the wavelengths of light emitted from streetlights and other local light sources, only allowing for a specific bandwidth of light to pass through the filter. Reducing the effects of light pollution drastically improves the signal to noise ratio in images which helps improve their quality.
Emission nebulae such as the Orion Nebula, Pac Man Nebula and others emit light within certain Hydrogen Alpha and Oxygen III wavelengths and the L-eXtreme f/2 lets only these wavelengths pass through to the camera sensor resulting in highly detailed astroimages.
Specifications of the Optolong L-Extreme F2 include:
– Substrate optical glass
– Filter size: 50.8mm (2″)
– Optical Thickness 1.85mm
– Filter Wavelength: OIII 7nm, Ha 7nm
– Filter Bandwidth/Bandpass: 300-1000nm
– Blocking Depth: >OD4
– Transmitted Wavefront: RMS λ/4
You can learn more about Optolong L-Extreme F2 here.
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