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Something I just tried was to use a single ball bearing with a torch to create a cheap artificial star. Works brilliantly for the centre of field.
This was fine but I was getting sick of slewing the telescope to check the corners so I bought a bunch of smaller bearings and glued them onto a board spaced appropriately to fill the FOV of my camera. Have to get a ruler out to measure the distances so they are the same and paint the board backing matt black to avoid unwanted reflections.
Tim
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