Lunt 60mm Full Aperture H-Alpha Etalon Filter Set
Sixty Millimetres Of Unobstructed Hydrogen Alpha
This 60mm full aperture H-alpha etalon package from Lunt places a 60mm tilt tuned etalon in front of your refractor with no central obstruction. Each etalon is individually tested on Lunt metrology equipment and carries a verified 0.4 Angstrom bandpass, so the figure on your unit is measured rather than assumed.
The extra aperture over the 50mm set raises resolution and image brightness, which helps when you push magnification on filament structure or want a cleaner full disc frame. Tilt tuning shifts the passband across the hydrogen alpha line at 656.28 nm, and the filter lifts straight off so the refractor returns to night sky duty.
A Lunt blocking filter must sit in the optical path at all times. Order the set with a B600 for focal lengths to 540 mm, a B1200 to 1080 mm, a B1800 to 1620 mm or a B3400 for the longest focal lengths, and pick the 2 inch or 1.25 inch fitting to match your focuser.
Key Features
- Verified Bandpass - 0.4 Angstrom, individually measured on Lunt metrology equipment for every unit
- Full 60mm Aperture - no central support foot, so the whole objective area stays clear
- Tilt Tuned - angle the housing to place the passband on the 656.28 nm line
- Double Stack Capable - in series with a second etalon the combined bandpass drops below 0.28 Angstrom
- Blocking Filter Options - B600, B1200, B1800 and B3400 to match focal length and sensor size
- Hard Case - stored in an aluminium case with fitted foam
| Specifications | |
|---|---|
| Type | Front mounted full aperture hydrogen alpha etalon filter set |
| Etalon Aperture | 60 mm, no central obstruction |
| Wavelength | Hydrogen alpha, 656.28 nm |
| Single Etalon Bandpass | 0.4 Angstrom, individually verified |
| Double Stack Bandpass | Less than 0.28 Angstrom with a second etalon in series |
| Tuning | Tilt tuned |
| B600 Blocking Filter | 6 mm clear aperture, up to 540 mm focal length, 1.25 inch or 2 inch diagonal |
| B1200 Blocking Filter | 12 mm clear aperture, up to 1080 mm focal length, 1.25 inch or 2 inch diagonal |
| B1800 Blocking Filter | 18 mm clear aperture, up to 1620 mm focal length, 1.25 inch or 2 inch diagonal |
| B3400 Blocking Filter | 34 mm clear aperture, up to 3060 mm focal length, 2 inch straight through tube |
| 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 | Aluminium hard case with fitted foam |
| Filter Weight | Lunt lists approximately 3 lb for the etalon assembly |
| Storefront Listing | Published as Lunt LS60FHa Front Mount 60 mm Double Stack Filter, etalon only, blocking filter sold separately |
| Model / SKU | LS60FHa2/B600, LS60FHa1/B600, LS60FHa2/B1200, LS60FHa1/B1200, LS60FHa2/B1800, LS60FHa1/B1800, LS60FHa/B3400 |
| Shipping Weight | 11 lb |
| Warranty | 5 years from date of purchase, original purchaser, manufacturing and workmanship defects |
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