About the Lunt 230mm
The Lunt 230mm H-Alpha Solar Telescope is the largest in serial production manufactured Lunt H-Alpha Solar Telescope in the world: a refractor system with a aperture of 230 mm, and 1600 mm focal length, fully unobstructed! Utilizing both, advanced high-contrast coatings and the innovative air-pressure tuning system "Pressure Tuner", the Lunt Solar Telescope user will be able to experience an un-paralleled level of visual and imaging performance.
The weight of the Lunt 230mm H-Alpha Solar Telescope is around 30 kg, it is equipped with a Starlight Instruments 2" Feather Touch focuser, tube rings, and a 3" dovetail bar (Losmandy level). Because of this Lunt Solar Telescope''s high focal length it comes only with the large B3400 Lunt Solar Blocking Filter.
What is the Pressure Tuner system included with the Lunt 230mm 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 Lunt Solar Telescope 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 Lunt Solar Telescope degrades, prominences and surface details are no longer visible.
Therefore, the Etalon filter systems of the Lunt 230mm H-Alpha Solar Telescope 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 Lunt Solar Telescope filter. At sizes of a few Angstrom, it is obviously not easy to achieve the exact adjustment by mechanical tilting. And because the 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 H-Alpha Solar Telescopes takes a different path. The Etalon filter of the Lunt 230mm H-Alpha Solar Telescope will not be tilted to only simulate a balance to the air pressure, but the air pressure in the Lunt Solar Telescope filter system is in fact adapted by 100 percent to the real external air pressure. Thereafter the air surrounding the 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 H-Alpha Solar Telescopes is also called True Doppler Tuning, and it achieves much better results than conventional tuning systems.
- Because of the high focal length it comes only with the large B3400 blocking filter and achieves
- Largest in serial production manufactured H-alpha solar telescope in the world
- A refractor system with a aperture of 230 mm, and 1600 mm focal length, fully unobstructed
- True Doppler Tuning achieves much better results than conventional tuning systems
- Utilizing both, advanced high-contrast coatings and the innovative air-pressure tuning system "Pressure Tuner"
- Experience an un-paralleled level of visual and imaging performance
- Equipped with a Starlight Instruments 2" Feather Touch focuser, tube rings, and a 3" dovetail bar (Losmandy level)
Optics Type: Dedicated H-Alpha Solar Telescope
Optical Aperture: 230mm (Unobstructed)
Tuning: Internal Pressure Tune (Doppler True Tuning)
Image Scale: 3,366
Focal Length: 1610mm
F Ratio: 7
Focuser: 2" Starlight Instruments Feather Touch
Mounting: Rings with 12" Losmandy style plate and carrying handle
Storage: Aluminum finished hard case with fitted foam
Weight: 70 lbs (estimated)
Required Blocking Filter: B3400 straight thru installed in the focuser standard
Eyepiece: Lunt Zoom Eyepiece
Sun Finder: Televue Sol Searcher
Mounting: 12" Losmandy Style Dovetail Plate
Lunt Product Number: LS230THa/PT/B3400/FT
Price subject to change without notice. Please call for most current price quotation.