Wednesday, October 29, 2014

mark the tube

Helped Mr dos Santos understand why his day-to-day shots of the Sun showed the sunspots appearing at different angles. After checking which mount he was using—an equatorial—I suggested it was the camera position. He himself was causing the field rotation. He agreed. I proposed he make index marks on the camera or t-ring and then the telescope eyepiece shaft or focus tube.

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