REVIEW OF SUMERIAN OPTICS ALKAID 16” TRAVEL SCOPE
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The DMK 21AU04.AS is a B&W cam from imaging source answering the call for an inexpensive cam that offers good performance for beginning imagers to moderate imagers on a limited budget
Believe it or not, there’s a little-known thin film solar filter on the market that is remarkably inexpensive and provides excellent performance
This is one observer's attempt to look at these eyepieces as objectively as possible and rate them "head to head". I've got good eyesight and see coma and other optical imperfections quite easily, so I think I gave
In 1981, with a newly purchased full aperture solar filter, I turned my C8 telescope to the Sun for the first time. I was absolutely amazed that one could actually view the fiery surface of our daytime star. I was also amazed at how quickly it changed. It only took a year to add a hydrogen-alpha solar filter to my observing arsenal. I was hooked forever on solar observing.
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!
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.
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)
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.