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Coronado ST 70/400 SolarMax III BF15 H-alpha OTA
With a wider BF15 assembly, the Coronado ST 70/400 SolarMax III BF15 H-alpha OTA combines 70mm aperture with 400mm focal length, RichView tuning, and SolarMax III filtration.
- 70mm aperture provides 1.65-arcsecond resolution
- 400mm focal length uses f/5.7 optics
- Single-etalon bandwidth measures <0.7 Angstroms
- BF15 blocking module is included
- 10:1 focuser supports fine adjustment
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Description
Wider blocking-filter clearance defines the Coronado ST 70/400 SolarMax III BF15 H-alpha OTA, a dedicated 70 mm solar refractor with a 400 mm focal length and listed f/5.7 optical ratio. Its external-etalon system provides a below 0.7 Angstrom Hydrogen-alpha bandwidth at 656.3 nm, while the BF15 diagonal, RichView and T-Max tuning, dual-speed 2-inch focuser, Sol Ranger finder, Vixen-style dovetail rail, Cemax eyepiece, and aluminum carrying case form the supplied solar observation configuration.
The complete solar optical path must remain assembled and unmodified for every observation, with the BF15 blocking-filter module and external etalon used exactly as specified by the manufacturer. Inspect the filter, diagonal, etalon housing, focuser, and dovetail connection before each session, avoid unsupported accessories in the light path, and discontinue use immediately if any component is damaged, loose, altered, or contaminated.
Key Features of Coronado ST 70/400 SolarMax III BF15 H-alpha OTA
This dedicated Hydrogen-alpha solar refractor combines a 70 mm aperture with a 400 mm focal length, below 0.7 Angstrom bandwidth, 656.3 nm operation, RichView tuning, T-Max interface, BF15 blocking-filter diagonal, dual-speed 2-inch focuser, Sol Ranger finder, Vixen rail, eyepiece, and carrying case.
- 70 mm Hydrogen-alpha solar refractor
- 400 mm focal length with listed f/5.7 optical ratio
- Below 0.7 Angstrom single-etalon bandwidth
- 656.3 nm Hydrogen-alpha operating wavelength
- BF15 blocking-filter diagonal module
- RichView and T-Max tuning controls
- Dual-speed 2-inch focuser with fine adjustment
- Sol Ranger finder, Cemax eyepiece, rail, and aluminum case
Full-Disc Solar Observation
The supplied application focuses on Hydrogen-alpha observation and recording of chromospheric details, prominences, filaments, and other solar features through the external etalon and BF15 blocking-filter assembly, while safe operation requires the original optical path, careful filter inspection, correct assembly, and strict compliance with the manufacturer’s solar safety instructions.
Why Choose Coronado ST 70/400 SolarMax III BF15 H-alpha OTA
The SolarMax III BF15 configuration is relevant for solar observers who need a 70 mm dedicated Hydrogen-alpha aperture with a wider BF15 blocking-filter module, RichView tuning, dual-speed focusing, Sol Ranger alignment, Vixen mounting, supplied eyepiece, and protective carrying case for structured solar observation and compatible recording workflows.
- 70 mm aperture with below 0.7 Angstrom Hydrogen-alpha bandwidth
- BF15 module for the supplied solar observation configuration
- RichView tuning, focuser, finder, rail, eyepiece, and case included
Coronado 5-Year Limited Warranty
The supplied product information lists a 5-year limited warranty for this solar telescope, and the applicable warranty duration, etalon coverage, BF15 filter coverage, registration process, and authorized service procedure should be confirmed before use because damage, modification, incorrect assembly, or operation outside the original SolarMax optical configuration may affect safety and warranty eligibility.
Coronado ST 70/400 SolarMax III BF15 H-alpha OTA Specs
| Brand | Coronado (Meade Instruments) |
| Full Model Code | Coronado SolarMax III 70mm f/5.7 Refractor with RichView Tuning System and BF15 |
| Country of Origin | United States / Mexico |
| Optical Design | Dedicated Hydrogen-Alpha Solar Refractor (External Etalon Core) |
| Aperture | 70 mm (2.75 inches) |
| Focal Length | 400 mm |
| Focal Ratio | f/5.7 |
| Optical Coatings | Fully Multi-Coated Anti-Reflection Solar Rejecting Layer Matrix |
| Bandwidth | < 0.7 Angstroms (Single Etalon Configuration with RichView Mechanical Tuning Hub) |
| Operating Wavelength | 656.3 nm (Hydrogen-Alpha Spectrum) |
| Blocking Filter Diameter | 15 mm (BF15 Diagonal Assembly Profile) |
| Resolving Power | 1.65 Arcseconds (Dawes) |
| Optical Tube Material | Premium Machined Aluminum and Brass Housing |
| Focuser Style & Mechanism | Dual-Speed 2-inch Rack and Pinion Focuser with 10:1 Fine Tuning Control |
| Thermal Stability | 0.003 nm / °C RichView and T-Max Doppler Tuning Interface |
| Optical Tube Dimensions | 101.6 mm x 457 mm |
| Optical Tube Weight | 3.45 kg (7.6 lbs) |
| Mount Attachment Type | Full-Length Vixen Style Dovetail Mounting Rail Profile |
| Finder Scope Specification | Coronado Sol Ranger Solar Finder Assembly |
| Included Accessories | Cemax 18mm Eyepiece (22x), BF15 Blocking Filter Diagonal Module, Sol Ranger Solar Finder, Vixen Dovetail Bar, Hard Black and Gold Aluminium Carrying Case |
| Standard Warranty | 5-Year Limited Warranty |
| Application | Professional-grade solar imaging and unvignetted sensor illumination, leveraging a widened 15mm rear blocking module and true external filtration to deliver full-disk chromospheric tracking. |
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