The standard system includes the B600 blocking filter, which provides full disk images on telescopes up to 540mm focal length. Larger blocking filters suitable for longer focal length telescopes are also available options.
These Hydrogen-alpha Filters are designed to retrofit (adapters required) the customer supplied telescope for use during the day. They are easily removable so that the scope can continue to be used for night observing.
Several sizes can be matched to the existing scope aperture with the appropriate adapter. All LS50FHa systems include a front-mounted filter and a rear mounted 2″ or 1.25″ blocking diagonal. Choose the blocking filter that best suits your telescope and your focuser size.
Because the LS50FHa has an estimated bandpass of < 0.70 Angstroms it is capable of providing high contrast views of both surface and edge detail. Adding an additional etalon system (double-stacking) will reduce the bandpass to ~ < 0.50 (dependant upon scope) allowing for higher resolution viewing and/or imaging. The part number LS50FHa is offered for this purpose or for those who already have a Lunt blocking filter. A Lunt blocking filter must be used with Lunt Ha filters at all times.