Internal double-stack module with new-generation etalon Compatible with Lunt LS80MT, LS80THaPT & LS100MT telescopes Dramatically increases chromospheric contrast for fine solar details User-installable design requires no factory return Features dual independent Doppler True tuning knobs Description FAQ Specifications In the Box Downloads Warranty Lunt Internal Double Stack Small Format (SFPT) Module The Lunt Internal Double Stack Small Format (SFPT) module adds a second, internal etalon to your LS80MT, LS80THaPT, or LS100MT telescope, unlocking a significant increase in solar surface contrast. This user-installable upgrade transforms textured solar features into sharply defined structures, revealing the complex, multi-strand architecture of filaments and the full magnetic complexity of active regions. Dual independent Doppler True tuning knobs provide precise, independent control over each etalon, allowing you to optimize the view for any feature on the sun's dynamic chromosphere. The SFPT Double-Stack Advantage: Unlocking Chromospheric Detail By adding a second etalon inside the telescope, the SFPT module dramatically narrows the bandpass of the optical system. The improvement in chromospheric contrast is immediate, revealing a level of detail that single-stack systems at this aperture cannot resolve. What previously appeared as simple texture separates into discrete, high-contrast structure. Filaments and Prominences: Dark filaments resolve into complex, multi-strand architectures, while prominences show internal threading and flow patterns. Surface Detail: Plage boundaries sharpen into defined cellular networks, and the intricate magnetic structure of active regions becomes fully visible. User-Installable Design for LS80MT, LS80THaPT & LS100MT The SFPT module is engineered for straightforward installation by you, eliminating the need for a costly and time-consuming factory return. This design choice makes the double-stack upgrade a flexible investment that can be made at the time of telescope purchase or at any point in the future. Because the module fits entirely inside the main telescope body, it does not alter the instrument's external dimensions, balance, or its capability for nighttime observing. Precision Control: Dual Independent Doppler True Tuning This module includes two separate Doppler True tuning knobs, one for the telescope's primary etalon and one for the new internal etalon. This dual-control system is critical for achieving optimal contrast across the entire solar disk. You can independently adjust each etalon to suppress Doppler-shifted light from different solar features, ensuring you can dial in the highest possible contrast for any target, from limb prominences to surface granulation. What is the main benefit of adding the Lunt SFPT Double Stack module to my LS80MT or LS100MT? The primary benefit is a dramatic increase in solar surface contrast. The second etalon narrows the system's light bandpass, which makes faint chromospheric details like filaments, plage, and the complex structure within active regions significantly more visible and sharply defined. Do I need to send my Lunt telescope back to the factory to install the SFPT module? No. The Lunt SFPT module is specifically designed to be user-installable. This allows you to upgrade your telescope at your convenience without the downtime and expense of shipping it back to the manufacturer. How does the SFPT module affect viewing prominences versus surface detail on the Sun? While a single-stack system is excellent for prominences, the narrower bandpass of a double-stack system excels at revealing fine surface detail. With the SFPT installed, you will see significantly more structure in filaments, active regions, and plage. The dual tuning knobs allow you to adjust the view to optimize for either prominences or surface features, though the greatest improvement is seen on the surface. Why are there two tuning knobs on the Lunt SFPT Double Stack module? The two knobs provide independent Doppler True tuning for each etalon (the original one in your scope and the new one in the SFPT module). This allows you to precisely shift the bandpass of each filter separately to achieve the highest possible contrast on any solar feature, compensating for Doppler-shifted light from different areas of the sun. Will adding the SFPT module change the balance or nighttime use of my Lunt Universal Telescope? No. Because the SFPT is an internal module, it does not change the telescope's external dimensions, weight distribution, or balance. Your Lunt Universal Telescope remains fully capable for nighttime deep-sky or planetary observing without needing to remove the module. Can I use the Lunt SFPT module to see more detail in a solar filament near an active region? Absolutely. This is a scenario where the SFPT excels. The enhanced contrast will make the dark, multi-strand structure of the filament stand out sharply against the bright chromosphere, and you'll be able to see the complex magnetic webbing of the surrounding active region with much greater clarity than in a single-stack view. SKU DSII/SFPTP This product is an internal module and does not ship with separate accessories. Download Manual Lunt Solar Systems 5-Year Warranty
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