Astronomy |
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The Solar
Adventure We have been fascinated by the sun since Barlow Bob first introduced us to Hydrogen Alpha images of the sun outside the Holiday Inn at NEAF in Suffern, New York. We use a Coronado SolarMax 40 filter connected to the front of the Tele Vue 85 but Barlow Bob occasionally comes over with his "Bob-O-Scope" (specially modified TV 102i with Coronado 90mm and Coronado 60mm filters stacked in front of a BF30 blocking filter) and gives us absolutely astounding views of the sun. For white light viewing, we made a solar filter from Baader solar film and some cardboard. We used a Thousand Oaks glass solar filter on our Celestron G5 and much prefer the Baader solar film. Recently, Thousand Oaks released a solar film and we made a filter for the Tele Vue 85. In side by side comparisons the Baader and Thousand Oaks films performed about the same on the Tele Vue 85. We prefer the silver/white color of the sun through the Baader filter and use it most of the time. We have tried taking pictures of the sun in H-Alpha light using the Nikon Coolpix 4500 with less than satisfactory results. The pictures taken through the Nikon don't have much contrast, and focusing is difficult (nearly impossible). Recently, we used a Philips ToUcam Pro (840K) web cam to take pictures and the results were quite good. Unfortunately, the CCD sensor of the web cam is so small that we can only image a small portion of the sun. Other people seem to get good results with the Canon line of cameras so maybe a Canon 20D digital SLR is in our future. Click any picture for a larger view or click here to browse through the pictures. |