{"product_id":"152mm-h-alpha-solar-telescope-bf1200-pressure-tuner-ls152tha-b1200","title":"Lunt Solar 152mm H-Alpha Solar Telescope with 2\" Rack \u0026 Pinion Focuser \u0026 BF1200 - LS152THa\/B1200RP","description":"\u003ccenter\u003e\n\u003ch2\u003eAbout this Lunt 152mm H-Alpha Solar Telescope\u003c\/h2\u003e\n\u003cp style=\"text-align: left;\"\u003e\u003cem\u003eThis Lunt 152THa comes with a 2\" Rack \u0026amp; Pinion Focuser and B1200 Blocking Filter.  The B1200 is good for visual use.  If you plan to image the Sun with this telescope, we recommend the B1800 blocking filter or the B3400 blocking filter if you will be using a full-frame camera. You will also receive mounting rings and a dovetail, the Lunt Zoom Eyepiece, dust caps, and an aluminum reinforced case.\u003c\/em\u003e\u003c\/p\u003e\n\u003c\/center\u003e\n\u003cp\u003eThe \u003cb\u003eLunt 152mm H-Alpha Solar Telescope\u003c\/b\u003e 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 \u003cmeta charset=\"UTF-8\"\u003e\u003cspan data-mce-fragment=\"1\"\u003e\u0026lt;0.65 Angstrom\u003c\/span\u003e! 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.\u003c\/p\u003e\n\u003cp\u003eAn internal etalon with new air-pressure tuning adjustment incorporated into the \u003cb\u003eLunt 152mm H-Alpha Solar Telescope\u003c\/b\u003e allows for a Lunt Solar Telescope Pressure Tuner system adapted the Etalon to varying altitudes and atmospheric pressures for always optimal performance.\u003c\/p\u003e\n\u003cp\u003eWhat is the \"Pressure Tuner\" system built into the \u003cb\u003eLunt 152mm H-Alpha Solar Telescope\u003c\/b\u003e? 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 \u003ca href=\"http:\/\/khanscope.com\/newEquipList.cfm?catID=1\u0026amp;subCatID=1\u0026amp;manID=40\" target=\"blank\"\u003eLunt Solar Telescope\u003c\/a\u003e 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 \u003ca href=\"http:\/\/khanscope.com\/newEquipList.cfm?catID=1\u0026amp;subCatID=1\u0026amp;manID=40\" target=\"blank\"\u003eLunt Solar Telescope\u003c\/a\u003e filter is no longer perfectly straight in the beam path, but slightly oblique, there may also be optical failures.\u003c\/p\u003e\n\u003cp\u003eThe new air-pressure system \"Pressure Tuner\" by Lunt Solar Systems takes a different path. The Etalon filter, part of the \u003cb\u003eLunt 152mm H-Alpha Solar Telescope\u003c\/b\u003e, 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 \u003ca href=\"http:\/\/khanscope.com\/newEquipList.cfm?catID=1\u0026amp;subCatID=1\u0026amp;manID=40\" target=\"blank\"\u003eLunt Solar Telescope\u003c\/a\u003e 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 \u003ca href=\"http:\/\/khanscope.com\/newEquipList.cfm?catID=1\u0026amp;subCatID=1\u0026amp;manID=40\" target=\"blank\"\u003eLunt Solar Telescope\u003c\/a\u003e is also called \"True Doppler Tuning\", and it achieves much better results than conventional tuning systems.\u003c\/p\u003e\n\u003cp\u003e \u003c\/p\u003e\n\u003ccenter\u003e\n\u003ch2\u003eLunt 152mm H-Alpha Solar Telescope Features\u003c\/h2\u003e\n\u003c\/center\u003e\n\u003cp\u003e \u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003eAdvanced Narrow Band Hydrogen-alpha Dedicated System\u003c\/li\u003e\n\u003cli\u003eA refractor based system with a 152mm front objective.\u003c\/li\u003e\n\u003cli\u003eAn unobstructed internal HD Etalon with the new Pressure Tuner \u003c\/li\u003e\n\u003cli\u003e2\" Rack \u0026amp; Pinion Focuser \u003c\/li\u003e\n\u003cli\u003eTube Rings with dovetail\u003c\/li\u003e\n\u003cli\u003eLunt Zoom Eyepiece\u003c\/li\u003e\n\u003cli\u003eTransport case\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ccenter\u003e\n\u003ch2\u003eLunt 152mm H-Alpha Solar Telescope Specifications...\u003c\/h2\u003e\n\u003c\/center\u003e\n\u003cp\u003eOptics Type: Dedicated H-Alpha Solar Telescope\u003c\/p\u003e\n\u003cp\u003eType: Single Interference HD Etalon\u003c\/p\u003e\n\u003cp\u003eTuning: air-pressure tuning system\u003c\/p\u003e\n\u003cp\u003eAperture: 152 mm\u003c\/p\u003e\n\u003cp\u003eFocal Length: 900 mm\u003c\/p\u003e\n\u003cp\u003eFocal Ratio: F6\u003c\/p\u003e\n\u003cp\u003eBandpass:  \u003cmeta charset=\"UTF-8\"\u003e\u003cspan data-mce-fragment=\"1\"\u003e\u0026lt;0.65 Angstrom \u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003eFocuser: 2\" Rack \u0026amp; Pinion\u003c\/p\u003e\n\u003cp\u003eColor: Pearl White with Black and Red accents\u003c\/p\u003e\n\u003cp\u003eWeight: 14 kg\u003c\/p\u003e\n\u003cp\u003e \u003c\/p\u003e","brand":"Lunt Solar Systems","offers":[{"title":"Default Title","offer_id":10554853569,"sku":"LUN-LS152THa\/B1200RP","price":7455.95,"currency_code":"EUR","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0851\/2766\/files\/LS152THa-Solar-Telescope-Lunt_6ae8e936-6660-48f0-98f8-ac3e030c938c.jpg?v=1776459212","url":"https:\/\/khanscope.com\/en-fr\/products\/152mm-h-alpha-solar-telescope-bf1200-pressure-tuner-ls152tha-b1200","provider":"Khan Scope Centre","version":"1.0","type":"link"}