Lunt 60mm Aperture Double Stack Filter
The Lunt Solar Systems 60mm Double Stack Filter is a double stack filter made especially for the Lunt 60mm h-alpha Solar Telescope and can also be fitted to the 80mm Solar Telescope with an adapter.
The 60F is the larger of 2 front mounted Double Stack Filters available for the 60mm Solar Scope. Both Filters reduce the bandpass to <0.5 Angstroms. However, the 60F allows for FULL aperture of the 60mm scope.
Adding the 60F to the 80mm Telescope will noticeably reduce the brightness of the image, this is typically an issue for visual use.
The 60F lowers the bandpass of the 60mm Solar Telescope to less than <0.5 Angstroms.
The 60F contains a 60mm UNOBSTRUCTED Etalon.
The 60F simply screws into the front of the 60mm Solar Telescope. (no adapters required). It will also adapt to the 80mm Telescope with an optional Adapter Plate.
The filter assembly has an integral ERF (Energy Rejection Filter) which removes 100% of harmful UV and a significant portion of the IR radiation.
The 60F is a tilt tuned filter. Before adding the 60F to your 60/80mm Solar Telescope you must tune the internal pressure tuned filter for maximum detail prior to installing the secondary filter. Once the secondary filter is installed turn the small tilt wheel at the base while looking through the telescope at low to medium magnification. Tune for best detail. Some very minor adjustments can then be done to the internal pressure tuned filter via small rotation of the PT knob to optimize the details of interest.