{"product_id":"lunt-solar-internal-double-stack-module-for-ls80mt-and-ls100mt-solar-telescopes","title":"Lunt Solar Internal Double Stack Module for LS80MT \u0026 LS100MT Solar Telescope - DSII\/SFPTP","description":"\u003ch3 style=\"text-align: center;\"\u003eLunt Solar Internal Double Stack Module\u003cbr\u003efor LS80MT or LS100MT Solar Telescope\u003c\/h3\u003e\n\u003cp\u003e \u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eNow with new-generation etalons — every unit individually tested on Lunt's precision metrology equipment. Every specification is verified, not estimated.\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003eThe SFPT is the internal double-stack module for Lunt's 80mm and 100mm Universal Modular Telescopes. It adds a second precision etalon inside the telescope body, reducing combined system bandpass from 0.45Å single-stack to \u0026lt;0.28Å — without altering the telescope's external dimensions, balance, or night-sky capability.\u003c\/p\u003e\n\u003cp\u003eThe improvement in chromospheric contrast at \u0026lt;0.28Å is immediate and significant. Surface detail that single-stack views render as texture separates into discrete structure. Plage boundaries sharpen into defined cellular networks. Filaments reveal dark cores and complex multi-strand architecture. Active regions display the full depth of their magnetic complexity. Prominences show internal threading and flow patterns that single-stack instruments at this aperture simply cannot resolve.\u003c\/p\u003e\n\u003cp\u003eThe Lunt DSII\/SFPT is designed for customer installation — no factory return required. It can be purchased at the time of telescope acquisition or at any point thereafter, making the DS upgrade a genuine deferred investment rather than a permanent commitment at point of sale. The module includes dual independent Doppler True tuning knobs — one for each etalon — allowing precise independent control of bandpass position for optimum contrast on any target.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eSpecifications\u003c\/strong\u003e\u003c\/p\u003e\n\u003cul\u003e\n\u003cli style=\"list-style-type: none;\"\u003e\n\u003cul\u003e\n\u003cli\u003eModel: SFPT — Internal Double Stack Module\u003c\/li\u003e\n\u003cli\u003eCompatible With: LS80MT Universal Telescope | LS100MT Universal Telescope\u003c\/li\u003e\n\u003cli\u003eSingle Stack Bandpass: 0.45Å (telescope internal etalon)\u003c\/li\u003e\n\u003cli\u003eModule Etalon Bandpass: 0.35Å — individually verified\u003c\/li\u003e\n\u003cli\u003eDS Combined Bandpass: \u0026lt;0.28Å — SFPT (0.35Å) + MT internal PT (0.45Å)\u003c\/li\u003e\n\u003cli\u003eTuning: Dual independent Doppler True Barometric pressure tuning\u003c\/li\u003e\n\u003cli\u003eInstallation: Customer-installed — no factory return required\u003c\/li\u003e\n\u003cli\u003eNight Sky Use: No impact — internal module does not affect night configuration\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"Lunt Solar Systems","offers":[{"title":"Default Title","offer_id":31729217536113,"sku":"LUN-DSII\/SFPTP","price":2093.0,"currency_code":"CAD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0851\/2766\/products\/DS2-80-Double-Stack-Filter-Lunt-Solar-Telescope.jpg?v=1776459075","url":"https:\/\/khanscope.com\/products\/lunt-solar-internal-double-stack-module-for-ls80mt-and-ls100mt-solar-telescopes","provider":"Khan Scope Centre","version":"1.0","type":"link"}