Observe the Sun
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Sonnenbeobachtung
Solar observation is a very interesting area of Astronomy. There is something new to see here practically every day. Our home star is constantly changing! Regardless of in white light or in the narrow-band hydrogen or calcium band, observations of the processes on the sun are very impressive!
50mm H-alpha double-stack solar filter, for all LS50FHa filter-systems and LS60THa/LS60MT telescopes
60mm H-alpha double-stack solar filter, for all LS60FHa filter-systems and LS60THa/LS60MT telescopes
- Reduces approx. 98% of heat reaching the optics to keep Etalon from drifting off-band and protect your equipment.
- 30nm FHWM Bandpass at H-alpha (H) wavelength of 656.28 nm (Full Width Half Minimum) Transmission: ~95.5%
- 40nm FHWM Bandpass with CWL at 395nm covering Calcium H-Line and Calcium K-Line wavelengths. Transmission: ~90.5%
- UVIR blocking OD3 0.1% @400-1100nm blocking over 98% of heat to your 3rd party Etalon at eyepiece or camera end, E.g. Daystar Quark). Please note it's your responsibility to use a proper commercial Etalon with this product, and to follow the manufacturer's instructions.
- Visible light blocking: OD4 0.01% @400-700nm to reduce reflection effects and over 98% of heat.
- Diameter 140mm Thickness 12.0mm (required to achieve surface precision)
- Multilayer coatings with SiO2 protective overcoat.
- ERF Holder cell included with soft tip threaded knobs. Tough and very light, easy to disassemble for cleaning the filter with optical wipes. Cell does not put any tension on the optics.
The Altair Solar Energy Rejection Filter or D-ERF protects your telescope and solar imaging equipment from excessive heat build-up when solar imaging or observing with your Daystar Ha Quark, or other Etalon filters.
The Altair Solar Energy Rejection Filter or D-ERF protects your telescope and solar imaging equipment from excessive heat build-up when solar imaging or observing with your Daystar Ha Quark, or other Etalon filters.
Altair 2nm G-Band Solar Contrast Filter filter specifications:
- Standard 1.25" Filter Threaded Aluminium Cell
- CWL 430.3nm @ 96% transmission, tolerance 1%
- FWHM 2nm, tolerance 0.5nm.
- 1.85mm thick quartz ?/4, Parallelism (arcsec) 30"
- Si02 "hard" overcoat with UVIR Block 300-1100nm and Anti-Reflection Coating
- High resolution spectrographic test report included corresponding to each individual filter.
Characteristics:
- High quality surfaces for best contrast values
- Completely closed body with light catch
- Pre-installed ND3 filter and integrated polarizer
- Setup of the polarizer by turning the eyepiece sleeve
- APM FastLock eyepiece sleeve
- Delivery with solid Aluminum case
- Backfocus 115 mm
- Weight 830 grams
