Introduction: Solar Eclipse Viewing
I know this is a belated Instructables on the solar eclipse, but better now than never! In this tutorial, I will show you how I photographed the solar eclipse with a cheap $35 telescope, a solar viewer and my smartphone. Although I wasn't in the path of totality, I was still able to capture some amazing shots and a timelapse of the solar eclipse. My coverage was around 60% (moon covering the sun). Using my mini telescope (from the lens adapter project), I was able to make a new mount for my phone in time for the event.
Step 1: Setup for Photographing
You could see my setup was nothing special. Just a large solar viewer, that didn't completely cover the telescope, stuck on one end with blue painter's tape, and my 3d printed adapter (files are on thingiverse) to hold my phone in place. The adapter was an altered version of my binocular adapter project, where I placed binoculars over my smartphone to take pictures of far away objects (link). After cracking my phone screen while using my old adapter, I made two little cuts (with my rotary tool) on top and slid rubber bands on to hold my phone in with this version. The rubber bands were held in place by a dab of hot glue, one of which I lost in the grass.
Step 2: Results
I was blown away that my little telescope (35x magnification) was able to capture sunspots (the black dots you see above). My first thought was that my camera or telescope had some dust on it, but NASA confirmed that these were the real deal. Since I didn't have a tracker to follow the sun, the tripod was moved by hand. That's why the sun in the timelapse moves back and forth every so often.
Step 3: Pinholes!
It's a little hard to make out, but the leaves in the trees acted like numerous pin-holes, casting shadows of the covered sun. Looking closely at the bright spots, every one of them looks like a crescent moon. Pinholes work by reducing the incoming light, allowing for the light source to take shape. A fun experiment to try is using a piece of aluminum foil with a small hole (made with a thumbtack) as the pinhole to see the shape of the original light source. If you think about it that's how pinhole cameras work since the object is reflecting light (it becomes the light source!).
Step 4: Conclusion
While setting up, the neighbors and their children came by to see what I was doing. I enjoyed telling them about the eclipse and showing them how to use their pinhole viewers. While talking to them, I had this crazy idea to put a pin-hole over my solar viewer and further cut down on the light coming in. I thought I was onto something, but the spots that appeared on the image were just dust particles.
That's all I have for this eclipse. Luckily, the next eclipse going across part of the United States in 2024 will put me right in the path of totality (100% coverage!). I'm hoping I'll have even better picture taking equipment by then. Maybe I'll have an Arduino based star tracker built by then, so I won't have to manually track the sun. I bet my town will be heavily crowded with eclipse chasers.
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