Answers for Hi. I have bought a model mirror ZC-TA-SPHRP-PM-160. I need to be informed of the "Focal Distance" (f) corresponding to said mirror. Thank you.

Cassini Spherical Primary Mirror

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Expert Answer

Answered by Ethan C., Gear Expert, from IL, United States, on May 22, 2018

The Focal Distance of the 160mm mirror is 1300mm.

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Answered by jopah, guest, from NY, United States, on March 25, 2018

For both lenses and mirrors, the focal ratio (f/number) is equal to the focal length divided by the aperture (mirror diameter.) I hope this helps.

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