Lunt Solar 152mm H-Alpha Solar Telescope with 2" Rack & Pinion Focuser & BF1200 - LS152THa/B1200RP

The Lunt 152mm H-Alpha Solar Telescope is a 6" refractor for solar observing and astro-imaging.  It has a 900 mm focal length, is 100% unobstructed, and sports a bandpass of <0.65 Angstrom! With a large image size and high resolution, the LS152THa system will perform to the highest level at any magnification. Utilizing advanced hi-contrast coatings and the new air-pressure tuning system "Pressure Tuner", the user will be able to experience crisp, sharp, high-magnification visual and digital images.

An internal etalon with new air-pressure tuning adjustment incorporated into the Lunt 152mm H-Alpha Solar Telescope allows for a Lunt Solar Telescope Pressure Tuner system adapted the Etalon to varying altitudes and atmospheric pressures for always optimal performance.

What is the "Pressure Tuner" system built into the Lunt 152mm H-Alpha Solar Telescope? The air pressure of the atmosphere varies, depending on if you are at sea level or on a mountain. Unfortunately also the sensitive Etalon filter systems respond to these air pressure variations. The wavelength range that is allowed through the filters, shifts as a function of the air pressure. This shifting is indeed minimal, but at bandwidths of less than one Angstrom it is already clearly visible. If the filter is not adjusted precisely to the H-alpha wavelength, the image of the sun through the telescope degrades, prominences and surface details are no longer visible. Therefore, the Lunt Solar Telescope Etalon filter systems have to be adjusted to the prevailing air pressure at the observation location. This Tuning called adjustment is typically done by a mechanical tilting of the filter. At sizes of a few Angstrom, it is obviously not easy to achieve the exact adjustment by mechanical tilting. And because the Lunt Solar Telescope filter is no longer perfectly straight in the beam path, but slightly oblique, there may also be optical failures.

The new air-pressure system "Pressure Tuner" by Lunt Solar Systems takes a different path. The Etalon filter, part of the Lunt 152mm H-Alpha Solar Telescope, will not be tilted to only simulate a balance to the air pressure, but the air pressure in the filter system is in fact adapted by 100 percent to the real external air pressure. Thereafter the air surrounding the Lunt Solar Telescope Etalon can simply be compressed or decompressed by the tuning system in order to change the air pressure between the surfaces. This allows the Etalon surfaces to always remain at the same perfect angle to the light waves but changes the diffractive index of the air in the chamber and thus accomplishes the same tuning expect that it goes around + or - 0.4 Angstrom on either side of the centerline. Therefore, the patent-pending "Pressure Tuner" system from Lunt Solar Telescope is also called "True Doppler Tuning", and it achieves much better results than conventional tuning systems.

• Advanced Narrow Band Hydrogen-alpha Dedicated System
• A refractor based system with a 152mm front objective.
• An unobstructed internal HD Etalon with the new Pressure Tuner 
• 2" Rack & Pinion Focuser 
• Tube Rings with dovetail
• Lunt Zoom Eyepiece
• Transport case

Optics Type: Dedicated H-Alpha Solar Telescope

Type: Single Interference HD Etalon

Tuning: air-pressure tuning system

Aperture: 152 mm

Focal Length: 900 mm

Focal Ratio: F6

Bandpass:  <0.65 Angstrom

Focuser: 2" Rack & Pinion

Color: Pearl White with Black and Red accents

Weight: 14 kg