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Can I swap different sizes of secondary mirrors in the same spider?

April 26, 2017different mirrors Secondary Spider swap

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Can I swap different sizes of secondary mirrors in the same spider?

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In general, this isn’t possible (or at least it is impractical). The central stem on the diagonal holder varies in diameter from 1/4″ up to 1/2″ depending on the secondary mirror size, so they’re not all interchangeable. Also, the overhang dimension changes with each secondary holder size, and there usually isn’t sufficient axial travel in the holder adjustment to accommodate two sizes at once without moving the position of the spider.