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Lunt 230mm H-alpha Solar Telescope - LS230THa/B3400
[LSS_LS230THa/B3400]

Lunt 230mm H-alpha Solar Telescope - LS230THa/B3400

Prijs: 32.840,00 EUR

 
Product Details

Lunt 230mm H-alpha Solar Telescope - LS230THa/ B3400

The largest in serial production manufactured H-alpha solar telescope in the world:

a refractor system with a aperture of 230 mm, and 1600mm focal length, fully unobstructed, like all Lunt Solar Systems telescopes!

Utilizing both, advanced high-contrast coatings and the innovative air-pressure tuning system ?Pressure Tuner?, the user will be able to experience an un-paralleled level of visual and imaging performance.

Utilizing both, advanced high-contrast coatings and the innovative air-pressure tuning system ?Pressure Tuner?, the user will be able to experience an un-paralleled level of visual and imaging performance.

The weight of the instrument 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 the high focal length it comes only with our large B3400 blocking filter.

What is the ?Pressure Tuner? system?

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 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 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 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 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 Systems is also called ?True Doppler Tuning?, and it achieves much better results than conventional tuning systems.

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