![]() ![]() If you have a 3D printer or know someone who does and you own this telescope, go to Thingiverse and download the files for printing. One of the first things I printed was a star diffraction mask made for the SkyWatcher Esprit 80 telescope. Update : Since publishing this blog entry, I am now in the 3D printing arena. > Ive considered adding assorted sorts of realistic star display to > Guide. That way you can repeat the position of the mask for future imaging sessions. Using a permanent marker, mark on the side of the optical tube a line which is aligned with one of the screws.Place the mask on the aperture of the optical tube pushing down until the edge of the optical tube is flush with the cross-hair wires.Optionally, you can apply some hot glue to the screws and wire ends to keep them from coming loose.You should have a perfect 90-degree cross hair. Then wrap the other end of the wire on the opposite screw and tighten the screw. Wrap one end of the wire around a screw and tighten the screw. Use small screws at each of these points but don’t tighten down.These will be anchor points for the crosshairs. Determine the center point of each of the 4 sides of the plywood cutout.If you want a nice snug fit and are worried about scratches to the tube, line the inside of the hole with a strip of flock tape with adhesive. After verifying the fit on the optical tube, I trimmed the plywood to a nice even square and painted it flat black on all sides.I used a Dremel with a hole cutter attachment. Cut a hold the diameter of the optical tube using the reading from above plus a millimeter extra.Chose a piece of plywood thick enough to set firmly around the outside of the optical tube without sliding.Measure the diameter of the optical tube, preferably with digital calipers.Dividing 80mm by 164mm gives 0.49mm for the crosshair thickness. This gives a ratio of 164 mm of aperture per 1 mm thickness of the cross hairs. ![]()
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