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The History of Science and Mathematics stack exchange has a question "When Did Telescopes become Affordable?" asking when telescopes became available to members of the general public instead of wealthy people, professional astronomers, sea captains, and army officers.

And I think that telescopes have become more affordable to the general public over centuries.

So do any amateur astronomers at this site have any information about the history of making telescopes to sell to amateur astronomers?

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This is an opinion based question and so I don't think there is an objective answer. For example what constitutes a wealthy person?

However, in his book "Celestial Objects for Common Telescopes", first published in 1859, the author, Thomas Webb, writes: Instruments quite sufficient for the student's purpose are far less expensive than formerly; a trifling outlay will often procure them, of excellent quality, at second-hand

This suggests to me that telescopes had become reasonably available by the mid 19th C.

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The first person to apply for a patent for a telescope was a Dutch eyeglass maker named Hans Lippershey (or Lipperhey). In 1608, Lippershey laid claim to a device that could magnify objects three times. However the word telescope is from Ancient Greek, so the concept is older than that. It wasn't until the 1930s, that due to the aluminized mirrors which were cheap to produce, that telescopes took off.

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