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Hydgrogen-Alpha Solar Filters



Solarscope SF70 H-Alpha Filter

Jun 27 2008 02:06 AM | Jeff Young in Hydgrogen-Alpha Solar Filters

For years I've been primarily a deep-sky observer, with a recent interest in at-the-eyepiece sketching.

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Coronado T-Max Tuner 90mm with Tele Vue BinoVue

Mar 29 2005 03:32 AM | cosmic rays in Hydgrogen-Alpha Solar Filters

A small and light 90mm set up: Takahashi Sky 90, TeleVue BinoVue, and Coronado H-Alpha filter on an AZ3 Mount with a counterweight and comfortable slow motion controls. Do not forget the adjustable observing chair and an old fashioned parasol or a beach umbrella!

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Baader Mark-IV Coronagraph

Mar 27 2005 12:56 PM | Guest in Hydgrogen-Alpha Solar Filters

A little about my Solar Observatory. The main instrument is an 6" f/12 Astro- Physics Triplet "Superplanetary" refractor, built with the NASA glass. This superb refractor telescope was given to me as a gift by Joseph. H.C. Liu, a well known Chinese astrophotographer and friend. It is mounted on an equatorial HGM-200 Losmandy with the Gemini system.

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Comparison of DayStar and Coronado H-a Solar Filters with Spectrohelioscopes

Mar 18 2005 06:40 AM | Guest in Hydgrogen-Alpha Solar Filters

Amateur astronomers have shown a growing interest in solar observation ever since Coronado introduced their line of solar H-a filters to compete with the industry stalwart, Daystar, several years ago (other solar H-a filters are made by Hardin Optical and Baader Planetarium). However, amateur solar observers too often neglect another instrument – the spectrohelioscope. Spectrohelioscopes were invented by G.E. Hale in the 1920s and have steadily been improved and made more accessible to amateurs over the years. Fredrick N. Veio’s authoritative book “The Spectrohelioscope” established his reputation at the vanguard of amateur solar astronomy. This book, as well as myriad designs, photos, discussions, articles mentioned below and other information can be found at http://spectrohelioscope.net. I recently asked Fred to compare the performance of a spectrohelioscope to commercially available H-a filters. The remainder of this report presents (with minor edits and additional material on my part) Fred’s observations on the benefits and weaknesses of each type of instrument for solar observation (Chris Westland, 22 May 2004)

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Coronado Instruments AS1-90 Hydrogen-Alpha Solar Filter/Takahashi Sky 90 Apochromatic Refractor:...

Mar 14 2005 06:13 AM | Dave Novoselsky in Hydgrogen-Alpha Solar Filters

I have become a confirmed Hydrogen-Alpha addict since my purchase of a Coronado Instruments ASP-60/Prom-15 T combination last year to use on my Pronto, an addiction that reached chronic levels when I sold the 60mm filter and purchased the half-again as large AS1-90 a few months later and added that and the BF-30 2" blocking filter as a combination to be used with my TMB 100 f/8 in the second generation William Yang OTA.

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Coronado Instruments AS1-90 Hydrogen-Alpha Solar Filter/Takahashi Sky 90 Apochromatic Refractor:...

Mar 13 2005 07:33 AM | Dave Novoselsky in Hydgrogen-Alpha Solar Filters

I have become a confirmed Hydrogen-Alpha addict since my purchase of a Coronado Instruments ASP-60/Prom-15 T combination last year to use on my Pronto, an addiction that reached chronic levels when I sold the 60mm filter and purchased the half-again as large AS1-90 a few months later and added that and the BF-30 2" blocking filter as a combination to be used with my TMB 100 f/8 in the second generation William Yang OTA.

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Daystar T-Scanner - 0.7 Angstrom Solar H-alpha Filter

Mar 12 2005 12:35 PM | David Knisely in Hydgrogen-Alpha Solar Filters

The active face of our nearest star, the Sun, is interesting to watch with the proper white light solar filter. However, with a narrow band filter tuned to the wavelength of the Hydrogen-alpha light (6562.8 Angstroms), the Sun changes from a well-mannered star with an occasional case of acne, to a huge seething angry red ball of gas in almost constant turmoil. To view the fascinating spectacle of the Chromosphere requires a very narrow and fairly expensive filter to eliminate all but the Chromosphere's contribution to the image. One filter which does this fairly well without exactly breaking the bank account is the DayStar "T-Scanner", 0.7 Angstrom H-alpha filter. With it, the door to the wonderful world of H-alpha is opened a crack, allowing the amateur a peek at a vista which was once reserved for only professional solar astronomers

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Coronado

Mar 12 2005 12:19 PM | Guest in Hydgrogen-Alpha Solar Filters

When I heard about the new Solarmax H-alpha filter from Coronado I was a bit skeptical. 40mm aperture, modestly priced, sub-angstrom performance, sounded too good to be true? Well, I am a solar nut, having owned several h-alpha filters over the years, and familiar with Coronado Instruments Group's (CIG) AS series filters, I could not wait to get my hands on a Solarmax to evaluate.

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Hydrogen-Alpha Solar Filters: Day Star And Coronado

Mar 12 2005 10:52 AM | Dave Novoselsky in Hydgrogen-Alpha Solar Filters

There are currently several Hydrogen-Alpha solar filter systems available on the market. The best known system, and the one that has been the most sought after by amateurs, is the Day Star system. (One of the Day Star products was reviewed elsewhere on this site.) Another company has developed a system that first became available only in the last few years, a system that works quite differently from and makes an interesting contrast to the existing Day Star system - the filters now sold through many US and Canadian dealers and manufactured on the Isle of Man in the United Kingdom by Coronado Instruments. Their ASP-60 (a 60mm, <0.7 A system) and the AS1-90 (a 90mm, <0.7 A system) were reviewed by yours truly also here at Cloudy Nights. (I purchased the ASP-60 first, got myself well and truly hooked on Solar, and now use the AS1-90 exclusively and am selling the smaller unit.)

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H-Alpha Showdown! CORONADO versus DAYSTAR

Mar 12 2005 10:43 AM | Guest in Hydgrogen-Alpha Solar Filters

I have been a solar enthusiast for 12 years now, and have owned a Lumicon, and several DayStar H-alpha filters. I recently took delivery of a new Daystar 0.45a ATM system, and a Coronado AS1 90 / BF 30 filter. I thought it would be an interesting comparison, and being familiar with the design and function of the Daystar, was eager to compare the new Coronado.

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