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Photographing the Sun with different filters

On September 9 2004 I tested the Photographic and the Visual Baader Astro Solar Screen while shooting some images of the sun. All images where shot with the Nikon Coolpix 4500, mounted on the TAL 100RS 4-inch refractor and

a 20mm Vixen Lanthanum eyepiece.

There where several groups of sunspots visible as you can see on the overview image below. Near the western limb you can see sunspot group 671. just left of the centre are two groups visible, 667 and 669. On the eastern limb you can see sunspot group 672 just on the edge. The image was shot with a shutter speed of 1/1000 second and the ND 5 Baader Astro Solar Screen.

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On the image below shows a more detailed view of the western limb. This image was shot with a shutter speed of 1/2000 second and the ND 3.8 Baader Astro Solar Screen. Near the limb you can see sunspot group 671. To the right you can see two groups of sunspots, 667 being the lower, round sunspot and 669 the upper, more elongated sunspot.

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The last two images where shot with 4x optical zoom. The first image was shot with the Baader Astro Solar screen ND 5 and the second with the ND 3.8. The image taken with the ND 5 needed a shutter speed of 1/125 second. Otherwise the image would be to dark. The image taken with the ND 3.8 ND 3.8 was shot with a shutter time of 1/2000 second! This shows that with the Baader Astro ND 3.8 you can use much shorter exposure times, even when you zoom in at a relatively small area on the Sun’s surface.

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Posted by Math on 11/07 at 03:01 AM
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