It's just art if you were to include them in a final image, and in discussing it recently the purpose of the module was actually to help teach PSF's. The intensity along a spike was found to decrease as R-z2 with distance R from the reciprocal-lattice point. Startools does in fact have a module that can create more accurately-modeled diffraction effects of both Newts and refractors, with a load of options even down to screws, mirror clips, secondary size, and focuser protrusion. Likewise, a recent integration on M81 shows no spiking of the galactic center. My image also doesn't show any spikes from the Trapezium. William Optics Diffraction Spikes is an ultra high optical transmission Bahtinov mask which produces the clearest, brightest and longest diffraction spikes facilitating focusing with ease and accuracy. Oh also I clearly need to get my vanes straight and in line with each other, but that's another dose of reality compared to the too-perfect false spikes from that program. But the color diffraction is obvious, and can just be seen even on the smaller spikes of the dimmer stars. This spike isn’t present with refractors as it doesn’t have a secondary mirror. Pardon the crudity here, as I am still working out massive gradients due to my quite light-leaky new Newt, along with some seriously funky star shapes caused by the MPCC. This is not a natural appearance of the star in real life, but instead a photographic effect caused by how light bends or diffracts around an object or in this case the support beams in your secondary mirror in reflecting telescopes. Here's a deep crop on Hatysa next to Orion, taken this month. I presume if someone knew how to analyze the spikes, it would be real spectral information about the star. Mark beat me to it, but the spikes are actual diffraction, so if bright enough you should get a rainbow-like effect. The ones generated here are both too perfect and too flawed. Wires all the way across would also work. Another 90 degrees off will create a typical 4-vane Newt appearance. One protrusion will create a spike on both sides. I like 'em if they're real! If you want them with a refractor though, I'd at least lean towards semi-real, by sticking something on the dew shield.
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