LUNT LS80THa/B1800FTPT (0551310) Due to high demand expected delivery dates are constantly changing on these products - please phone to confirm latest stock status. Complete H-alpha Solar Telescope with 80mm aperture and <0.7 Angstrom bandwidth. With new air-pressure tuning system, zoom eyepiece, Sol-Searcher, Starlight Instruments Feather-Touch focuser, and B1800 Blocking Filter, that provides a smaller vignetting for imaging! H-alpha Telescope with internal Etalon and 80mm Aperture Pressure Tuner system B1800 blocking filter in star-diagonal Starlight Instruments Feather Touch focuser Tube Ring with 1/4"-20 connection and dovetail plate LUNT zoom eyepiece Sol-Searcher transport case The LS80THa is a complete Solar Telescope, a precision aligned ED refractor with a fully un-obstructed 80 mm optical aperture and 560 mm focal length. An internal etalon with new air-pressure tuning adjustment allows for a <0.7 Angstrom bandwidth. This "Pressure Tuner" system allows a better Etalon adjustment than other systems. The “Pressure Tuner” system adapted the Etalon to varying altitudes and atmospheric pressures for always optimal performance. Blocking Filter is the B1800. The star diagonal in which the blocking filter is installed, is equipped as standard for 1.25" eyepieces and with a T2 camera connection. Fine adjustment is achieved with Starlight Instruments high-end focuser Feather Touch with 10:1 reduction. Technical data: Aperture: 80 mm (ED refractor, unobstructed) Focal length: 560 mm Bandwidth: internal Etalon with <0,7 Angstrom Tuning: air-pressure tuning system Blocking Filter: B1800 with 1.25" and T2 connection Focuser: Starlight Instruments Feather Touch with 10:1 reduction Weight: 4 kg The telescope is upgradeable with the new DSII double-stack system. The optional DSII is a internal double stack module with "Pressure Tuner", that provides a bandwidth <0.5 Angstrom. In addition to the "Pressure Tuner" has the DSII module the advantage that there are no more Energy-Rejection-Filter installed, unlike front-mounted double-stack filters. The ERF are allready in the telescope. Therefore the sun's image is brighter and prominences can be better observed than with conventional double-stack systems.