Our sun is a fascinating target even when the solar activity is low - given that the telescope aperture can be increased sufficiently. When equipped with a heated SolarSpectrum H-alpha filter, telescopes from 80mm aperture to 280 mm aperture will show incredibly faint, rapidly changing structures. A SolarSpectrum filter with matching D-ERF-filter and telecentric beam accessories will turn almost every telescope into a highest resolution H-α-telescope. These heated H-alpha filters are manufactured for observatories and ambitious amateurs who want to utilize the aperture and resolution of their existing large telescopes for detailed imaging and monitoring faintest solar features, instead of just taking a quick look at our closest star with a comparably small objective aperture.
SolarSpectrum filters have no central obstruction and the whole H-alpha stack of optical elements inside is precision heated with a autocorrecting thermo-controller. There is no need for frequent manual or visual calibration or readjustment of the H-alpha line during the course of a day. Hence SolarSpectrum filters are the brand of choice for long term solar observation, time-lapse photography or public observation - were a large crowd of people must be served quickly without constant realigning of the H-alpha image.
The thermal calibration range is wide enough to shift the observed center wavelength – to observe in the red or blue wing of the H-alpha-line. SolarSpectrum filters are for those who prefer quality over price. They are available in different HBWs (band-widths). This influences solar surface contrast as shown in the photographs to the right.
Solar Spectrum Research-Grade filters are selected to deliver a very homogenous image across the complete field of view. The new series of SunDancer filters in addition allow for manual fine tuning to widen H-alpha wing observation.
Be warned: this intriguing combo of fast-changing protuberances, filaments, flares and surges rising up from the sun´s surface can cause you to become addicted to solar-observing!
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- The RG 0.4x Telecompressor is with 46mm clear aperture perfectly suitable amongst others for RG46 Research Grade Solar Spectrum H-alpha Filters
- 74mm focal length, optimized for videography and for showing the whole sun. Ø 16 mm corrected image field
- gets mounted eyepiece-sided directly onto the SolarSpectrum filter and reduces the previously by the telecentric system extended focal length again by a factor of 0.4
- 2" male threads on both sides, fitting Universal Flange Adapter #2958240 (included with SolarSpectrum H-alpha filters
- Telecompressor is used to adjust the focal length to possibly poor seeing conditions and / or enlarging the field for photographic- or webcam applications
- Telecentric with 54mm outer diameter and 2" (50.8mm) threads on both sides – T-2 Adapter and 2" m/f inverter ring included
- 46mm clear aperture - suitable for research grade filter.
- extra long backfocus of 250mm for optimized focal length reduction or binoviewing
- Aplanatic, with 3x focal length extension to achieve a parallel f/30 beam with f/10 refractors – without field curvutare
- Specially calculated and produced for H-alpha, with 99% Strehl (99% definition brightness at 656,3 nm)
- Solar Spectrum Sundancer Filter Series 1 & 1,5: Standard-Filter with a clear aperture of 19mm and 25mm respectively. Shows the full sun disc up to effective focal lengths of approx. 2200mm
- Different Halfbandwidths available – please choose "Version"
- incl. Pre-mounted Adapterset: 2x 2" SolarSpectrum Universal Flange #2958240, 1x 2"a to T-2i Reducer #2958242, 1x 2"a to T-2a Adapter #1508035, 2 pc. T-2 Dust caps (#2904000, #2904010)
- Noiseless heated H-alpha – Filter (lambda = 656,3 nm) with additional tilt-finetuning. 5 years warranty if handled properly