Here's something interesting... just read about a "Bahtinov mask"
It is placed in front of the primary mirror (not sure if that has to be right in front of, or up at the aperture is OK) and the offset grids create diffraction spikes in the image of a bright object than you can then line up to ensure perfect focus.
I wonder if I can make one? Hmm...
It is placed in front of the primary mirror (not sure if that has to be right in front of, or up at the aperture is OK) and the offset grids create diffraction spikes in the image of a bright object than you can then line up to ensure perfect focus.
I wonder if I can make one? Hmm...
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