Hotshoe Solar View finder

thingiverse

*WARNING!!!* Looking directly at the sun is extremely hazardous, except during the brief total phase of a solar eclipse ("totality"), when the moon completely covers the sun's radiant face. This phenomenon occurs only within the narrow path of totality (https://eclipse2017.nasa.gov/safety). *WARNING!!!* Aiming a camera at the sun will irreparably damage its imaging sensor if it lacks an adequate filter. (https://eclipse.aas.org/eye-safety/optics-filters) However, if you possess a solar filter for your camera and are seeking a convenient method to aim it at the sun, this approach might prove effective. This hotshoe adapter fits seamlessly on our Canon 7D. You may need to adjust the shoe slightly to accommodate other cameras. (Modify the version without supports.) When slicing, ensure that features detecting thin walls are enabled. In Slic3r, this is referred to as "Detect thin walls." If not, the "screen" will fail to appear in your print due to its narrow width. When printing, utilize a lighter-colored filament for optimal results (I prefer white). You will be able to observe the spot created by sunlight from either side of the projection screen. (View the third photo.) Perform this brief setup prior to the eclipse. To use: Place the solar viewfinder on the hotshoe bracket attached to your camera. With your camera positioned on a tripod and the filter in place over the lens, aim the camera so that its shadow is minimized. Set your camera to its widest angle view possible, then center the sun within your normal viewfinder. This may require some adjustment. Once centered, use a black marker to draw a circle around the spot on the printed viewfinder's screen. Avoid marking your camera's viewfinder or screen; mark only the printed one. Now you can quickly and accurately position your camera on the sun! Good luck, and happy viewing!