Designing Cassegrain type telescopes with spreadsheet

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Designing a reflective telescope system with paraxial optics is really easy, since there is no refraction involved. Pre-design calculations offer final solutions in most cases. Here I will demonstrate use of spreadsheet for designing a Cassegrain type reflective telescope.

Originally published 22.2.2013 by Jani Achrén. You can know more in here and here‘s the xls compatible spreadsheet.

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About adjusting Null corrector lens to correct distance

I have discussed a method of inserting a mechanical iris in front of the Null lens in order to easily adjust it to its correct position.

Originally published 15.2.2013 by Jani Achrén. You can read the rest in here (blog) and here (pdf).