Talk:BTA-6

A fact from BTA-6 appeared on Wikipedia's Main Page in the Did you know column on 3 February 2008, and was viewed approximately 3,700 times (disclaimer) (check views). The text of the entry was as follows:

Did you know... that after spending fifteen years building the largest telescope in the world, scientists in the Soviet Union were dismayed to find that BTA-6 performed much worse than the Hale telescope it was designed to beat?

A record of the entry may be seen at Wikipedia:Recent additions/2008/February.

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Ritchey-Chrétien or Cassegrain Telescope

The article state that the BTA-6 is of Ritchey-Chrétien type. However, the official website (http://www.sao.ru/Doc-en/Telescopes/bta/descrip.html) states that the primary mirror is of parabolic shapes. If correct, this would make the BTA-6 a Cassegrain telescope. A Ritchey-Chrétien system has hyperbolic primary and secondary mirrors while the older and inferior Cassegrain telescope uses a parabolic primary mirror combined with a hyperbolic secondary. --2001:16B8:118E:E200:232C:8D80:D9DE:CC65 (talk) 02:00, 20 December 2020 (UTC)[reply]