When selecting an (Ultra-)Narrowband/Highspeed filter, multiple factors must be considered
Detailed information about the newly introduced f/3 filter category and the influencing factors in filter selection, as well as detailed explanations why our high-speed filters must have a preshift to the respective center wavelength, can be found in this blog post and whitepaper.- Desired Filter Wavelength (H-alpha / OIII / SII)
- Average Working Temperature
- Needed Halfbandwidth (6.5nm or 3.5/4nm)
After selecting the above criteria, a graphic will appear from which you can determine the required filter category based on this information:
- Aperture ratio f/# (x-Axis)
- Central Obstruction in % (y-Axis)
