{"product_id":"152mm-h-alpha-solar-telescope-bf1800-pressure-tuner-ls152tha-b1800rp","title":"Lunt 152mm H-Alpha Solar Telescope with 2\" Rack \u0026 Pinion Focuser and BF1800 - LS152THa\/B1800RP","description":"\u003cp\u003e \u003c\/p\u003e\n\u003ccenter\u003e\n\u003ch2\u003eAbout the 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 B1800 Blocking Filter.  The B1800 is good for visual use and photography with standard sensors.  For full frame sensors, choose the B3400 model, which will provide you with a wider field of view. You will also receive \u003cspan data-mce-fragment=\"1\"\u003emounting rings and a dovetail, the Lunt Zoom Eyepiece, dust caps, and an aluminum reinforced case.\u003c\/span\u003e\u003c\/em\u003e\u003c\/p\u003e\n\u003c\/center\u003e\n\u003cp\u003eThe \u003cb\u003eLunt 152mm H-Alpha Solar Telescope\u003c\/b\u003e is perfect for the ambitious solar observer! If it's a perfect image you're after, the LS152THa \u003ca href=\"http:\/\/khanscope.com\/newEquipList.cfm?catID=1\u0026amp;subCatID=1\u0026amp;manID=40\" target=\"blank\"\u003eLunt Solar Telescope\u003c\/a\u003e provides a very large and high resolution image size. The 100% unobstructed system will perform to the highest level at both low and high magnifications. Utilizing both advanced hi-contrast coatings, and the new Doppler True Pressure Tuning system, the user will be able to experience crisp, sharp, high magnification visual images, as well as utilize this \u003ca href=\"http:\/\/khanscope.com\/newEquipList.cfm?catID=1\u0026amp;subCatID=1\u0026amp;manID=40\" target=\"blank\"\u003eLunt Solar Telescope\u003c\/a\u003e system for high end digital processes.\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\u003eThe \u003cb\u003eLunt 152mm H-Alpha Solar Telescope\u003c\/b\u003e is a 6\" refractor for solar observing: 152 mm aperture, 900 mm focal length, 100% unobstructed, and a bandwidth of Lunt Solar Telescope for professionals! If it is the perfect solar image you are after, then the LS152THa is the right \u003ca href=\"http:\/\/khanscope.com\/newEquipList.cfm?catID=1\u0026amp;subCatID=1\u0026amp;manID=40\" target=\"blank\"\u003eLunt Solar Telescope\u003c\/a\u003e system for you. It provides a large image size and high resolution. The system will perform to the highest level at any magnifications. Utilizing advanced hi-contrast coatings and the new air-pressure tuning system \"Pressure Tuner\", the \u003ca href=\"http:\/\/khanscope.com\/newEquipList.cfm?catID=1\u0026amp;subCatID=1\u0026amp;manID=40\" target=\"blank\"\u003eLunt Solar Telescope\u003c\/a\u003e user will be able to experience crisp, sharp, high-magnification visual and digital images.\u003c\/p\u003e\n\u003cp\u003eWhat is the \"Pressure Tuner\" system built into the \u003cb\u003eLunt 152mm H-Alpha Solar Telescope\u003c\/b\u003e?\u003c\/p\u003e\n\u003cp\u003eThe air pressure of the atmosphere varies, depending on if you are at sea level or on a mountain. Unfortunately also the sensitive \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 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 \u003ca href=\"http:\/\/khanscope.com\/newEquipList.cfm?catID=1\u0026amp;subCatID=1\u0026amp;manID=40\" target=\"blank\"\u003eLunt Solar Telescope\u003c\/a\u003e 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 \u003ca href=\"http:\/\/khanscope.com\/newEquipList.cfm?catID=1\u0026amp;subCatID=1\u0026amp;manID=40\" target=\"blank\"\u003eLunt Solar Telescope\u003c\/a\u003e 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.\u003c\/p\u003e\n\u003cp\u003eThe new air-pressure system \"Pressure Tuner\" by \u003ca href=\"http:\/\/khanscope.com\/newEquipList.cfm?catID=1\u0026amp;subCatID=1\u0026amp;manID=40\" target=\"blank\"\u003eLunt Solar Telescope\u003c\/a\u003e 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\u003ccenter\u003e\n\u003ch2\u003eLunt 152mm H-Alpha Solar Telescope\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.\n\u003cp\u003e  \u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003eA refractor based system with a 152mm front objective.\n\u003cp\u003e \u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003eAn unobstructed internal HD Etalon with the new Pressure Tuner allows for\n\u003cp\u003e  \u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003eThe system includes the mounting rings and dovetail and dust caps\n\u003cp\u003e  \u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003ePressure Tuner system\n\u003cp\u003e \u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003eB1800 blocking filter in 2\" Diagonal with T2 connection\n\u003cp\u003e \u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e2\" Rack \u0026amp; Pinion Focuser\u003cbr\u003e\n\u003cp\u003e  \u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003eTube Rings with dovetail\n\u003cp\u003e  \u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003eLunt Zoom Eyepiece\n\u003cp\u003e \u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003eTransport case\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003e \u003c\/p\u003e\n\u003ccenter\u003e\n\u003ch2\u003eLunt 152mm H-Alpha Solar Telescope - BF1800 - Pressure Tuner 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\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\u003eDiagonal: B1800 Blocking Filter in 2\" Diagonal \u003c\/p\u003e\n\u003cp\u003e \u003c\/p\u003e\n\u003cp\u003eLunt Product Number: LS152THa\/B1800\u003c\/p\u003e","brand":"Lunt Solar Systems","offers":[{"title":"Default Title","offer_id":10554854145,"sku":"LUN-LS152THa\/B1800RP","price":7721.95,"currency_code":"EUR","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0851\/2766\/files\/LS152THa-Solar-Telescope-Lunt_c9aa4c98-b0c9-466d-8fd7-12c5a492c3ca.jpg?v=1776459272","url":"https:\/\/khanscope.com\/en-fr\/products\/152mm-h-alpha-solar-telescope-bf1800-pressure-tuner-ls152tha-b1800rp","provider":"Khan Scope Centre","version":"1.0","type":"link"}