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Hi Rapid.
Using two triangles opposite each other would be fine. Or you could use four triangles. I just found that three made it easier for me to view the "coming together" of the multiple images. As an experiment you might want to try with just circles and use the mask with each circle placed over a vane (either two or four holes). This might be enough to create diffraction spikes anyway. As you mentioned I experimented with different designs on and SCT, but also a 4" refractor. I didn't have access to a Newt at the time. I would be interested in any results you come up with. If there is anything different the original article could be updated with the new info relating to newts.
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