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Why is this Space Telescope so Tiny?

If you want to take a look through a similar telescope, follow this link:    • Making a monolithic telescope Part 3:...   Optical Engineer Rik ter Horst shows us how he makes very small telescopes (at home) which are intended for use in micro-satellites. Contents: 0:00 Intro 1:06 About telescopes and focal length 3:35 The Cassegrain telescope 4:38 The Schmidt-Cassegrain telescope 5:18 The monolithic telescope concept 6:30 Rik ter Horst Interview 10:25 Riks' polishing setup 13:51 About manufacturing aspherics 16:50 Advantages of solid telescopes 17:49 Dreaming about a VLTT ORESAT PROJECT CORRECTION. I was notified that the name of the university behind the OreSat project is erroneous: It is the "Portland State University" (https://www.pdx.edu/), not University of Portland. Sorry about that! Direct link to the Oresat project: https://www.oresat.org/ Rik published details about the 1993 version of this type of telescope on cloudynights.com in 2013. https://www.cloudynights.com/topic/40... (archived article) 2:34 The image shows the second telescope of Galileo, not the first telescope of Lipperhey. The video contains images of external sources. Please visit their websites for more information: - Star party image was taken from: https://www.nps.gov/cebe/planyourvisi... - More amazing astro-photos made by Dick van Tatenhoven can be found at: https://www.sterrenwachtalmere.nl/don... - NOVA-Astron website: https://www.astron.nl/about/organisat... - Yerkes telescope photo from: https://www.space.com/26858-yerkes-ob... - Source of image at 0:41 is http://www.bxoptic.com/production-wor... - Image of the Schmidt plate and Cassegrain telescope taken from their respective Wikipedia pages: https://en.wikipedia.org/wiki/Schmidt... https://en.wikipedia.org/wiki/Schmidt... Do you like what I do and want to support it? I'v recently started a patreon page:   / huygens_optics   Did I forget a reference? Objections? Please let me know and I will set it straight and add a link.