The Lunt Solar Systems LS100THa is a complete solar telescope. The refractor based system has a precision-aligned singlet chromatic lens with a 100 mm aperture. The front singlet lens reduces the stray light over an achromat by half. With the matched collimation lens set, it also fully corrects on axis coma, astigmatism and de-centering aberrations and provides a full spherically corrected flat-field solar telescope. The focal length is 800 mm,  providing a ~7.3 mm image thru a 12 mm blocking filter. Course focus adjustment is via a slide tube. Focusing is achieved with a High Precision 2″ Starlight Feather Touch Friction focuser with the a 10:1 reduction as standard equipment.  An internal etalon with tune adjustment allows for a <0.7 Angstrom bandpass.

True Doppler Tuning allows for a shift into and away from the user.  Adding a 3D like component to the viewing experience. While it has minimal effect on proms due to their location at the edge of the disk, it does have an effect on filaments and active regions on the surface.  While looking at a filament at the center of the Sun, the user has the ability to Doppler shift from the base of the filament to the tip, following the filament through it’s structure toward you and away from you, allowing for enhanced visual and imaging capability for the observer as well as a research tool for the avid hobbyist.  The pressure tuning system provides an order of magnitude more precision to the tuning of the desired features.

Additionally, the system may also be purchased with the 100mm external, front mounted Double Stack Etalon LS100FHa for a bandpass of <0.5 Angstrom, or the LS100THa DSII Internal Double Stack Module (DSII/LS100T).  See below for more information.

LS100THa Specifications: (single stacked)

• Optical Aperture: 100mm
• Etalon: Internal <0.7 Angstrom
• Tuning: Internal Pressure Tune (Doppler True Tuning)
• Focal Length: 800mm
• F Ratio: F/7
• Focuser: 2″ Feather-Touch focuser with 10:1 reduction
• Tube diameter: 121mm
• Tube length with blocking filter: 634mm
• Storage: Aluminum finished hard case with fitted foam
• Weight: 13 lbs
• Starting at: US$4,647.00

Required Blocking Filter: (see “blocking filters”)

• B1200 for standard visual use (standard)
• B1800 for larger field of view and imaging applications (upgrade)
• B3400 for larger field of view and imaging applications (upgrade)

Included Accessories: (see “accessories”)

• Optical tube with 2″ feather touch focuser with 2.5″ travel,
  includes adapter
• B1200 Blocking Filter (on standard model)
• Sun Finder: Televue Sol Searcher
• Mounting: Lunt 12″ Dovetail
• Case: Aluminum Finished Hard Case with Custom Foam