Lunt 100mm Full Aperture H-Alpha Etalon Filter Set
One Hundred Millimetre Solar Etalon Filter Set
This 100mm full aperture H-alpha etalon package from Lunt is the largest front mounted etalon in the Lunt filter range. The etalon threads onto the front of a customer supplied refractor through a Lunt adapter plate, and the supplied adapters cover refractors up to 102 mm; anything larger needs a custom plate.
Like the smaller full aperture sets, the etalon covers the whole objective with no central support foot, and each set is ordered with a blocking filter chosen for your focal length and focuser size. The trailing 2 or 1 in each code tells you whether the blocking filter arrives in a 2 inch or a 1.25 inch fitting.
Lunt's own manual quotes under 0.75 Angstrom single stack and about 0.55 Angstrom when a second etalon is added, while dealer spec sheets quote under 0.7 and under 0.5. Both figures are shown below so you can see the spread. Note that the etalon on its own, without a blocking filter, is sold separately on our double stack etalon page.
Key Features
- Full Aperture - the etalon covers the whole objective with no central obstruction, as on the 50mm and 60mm sets
- Blocking Filter Choice - ordered with a B600, B1200, B1800 or B3400 blocking filter
- Focuser Fit - codes ending in 2 supply a 2 inch blocking filter, codes ending in 1 supply 1.25 inch
- Bandpass - under 0.75 Angstrom single stack per Lunt's manual, about 0.55 Angstrom double stacked
- Blocking Filter Required - a Lunt blocking filter must stay in the optical path at all times for safe viewing
- Adapter Plate Required - mounts to a customer supplied refractor through a Lunt adapter plate, sold separately
| Specifications | |
|---|---|
| Type | Front mounted full aperture hydrogen alpha etalon filter set |
| Etalon Aperture | 100 mm |
| Telescope Fit | Any customer supplied refractor via a Lunt adapter plate; adapters cover refractors up to 102 mm, larger apertures need a custom plate |
| Front Thread | M120 x 1.5 female on the filter body, per Teleskop Express and Bresser |
| Central Obstruction | None, in line with the other full aperture sets |
| Wavelength | Hydrogen alpha, 656.28 nm |
| Bandpass | Under 0.75 Angstrom single stack per Lunt's own LS100FHa manual; dealer spec sheets publish under 0.7 Angstrom. About 0.55 Angstrom when a second etalon is added |
| Tuning | Tilt tuned, front mounted integrally tuned etalon |
| B600 Blocking Filter | 6 mm clear aperture, visual to 600 mm and imaging to 400 mm focal length |
| B1200 Blocking Filter | 12 mm clear aperture, visual to 1200 mm and imaging to 600 mm focal length |
| B1800 Blocking Filter | 18 mm clear aperture, visual to 1800 mm and imaging to 1200 mm focal length |
| B3400 Blocking Filter | 34 mm clear aperture, visual to 3400 mm and imaging to 1800 mm focal length |
| Focuser Fitting | Codes ending in 2 supply a 2 inch blocking filter, codes ending in 1 supply 1.25 inch |
| Blocking Filter Required | Yes, a Lunt blocking filter must remain in the optical path at all times |
| Storage | Aluminum finished hard case with fitted foam |
| Storefront Listing | Listed on Lunt's DoubleStack H-Alpha Filters collection at 4,495 USD for the etalon alone, but the tile links to a product page that currently returns a 404 on Lunt's own site |
| Model / SKU | LS100FHa2/B600, LS100FHa1/B600, LS100FHa2/B1200, LS100FHa1/B1200, LS100FHa2/B1800, LS100FHa1/B1800, LS100FHa2/B3400 |
| Shipping Weight | 8 lb per the telescopes.net and Astronomy Plus spec tables |
| Warranty | 5 years from date of purchase, original purchaser, manufacturing and workmanship defects |
Manuals
Product Manual (PDF)Talk to a Specialist