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Q&A for Cassini Spherical Primary Mirror — 10 Questions & 12 Answers

Name Cassini Spherical Primary Mirror
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Q
Martin, guest, from CA, United States, asked on September 29, 2018

Hi - I bought the 160mm diameter mirror and there is a small white dot in the center (approx 3mm across) - what is this? and is it removable?

Featured Answer
A
Answered by Don, guest, from OR, United States, on March 25, 2019

This dot is placed by the manufacturer to assist in collimation.

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Q
AITOR, guest, from Alava, Spain, asked on March 17, 2018

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.

Expert Answer
A
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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Q
Anthony, member, from CO, United States, asked on January 01, 2021

Willl this work in a home made dobsonian with a secondary mirror of diagonal minor axis of 1.2 and a offset of .04.

Expert Answer
A
Answered by Ryan Tarczynski, Gear Expert, from IL, United States, on October 01, 2021

Was not provided with that information recommend reaching out to manufacturer.

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Q
Osvaldo, guest, from NM, United States, asked on December 04, 2020

Is this ground concave, or convex?

Expert Answer
A
Answered by Ryan Tarczynski, Gear Expert, from IL, United States, on October 01, 2021

Was not provided with that information recommend reaching out to manufacturer.

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Q
Chih-fen, guest, from CA, United States, asked on January 16, 2020

Could you use the 160 mm to build a reflector telescope?

Expert Answer
A
Answered by Ryan Tarczynski, Gear Expert, from IL, United States, on October 01, 2021

Yes it is. These are what makes them a reflector telescopes.

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Q
Rumbly, guest, from CT, United States, asked on November 19, 2019

Hi, What is the focal distance of the 80mm mirror? I see you you have posted the F.L. of of the 160mm but did not see the 80mm.

Expert Answer
A
Answered by Ethan C., Gear Expert, from IL, United States, on December 19, 2019

The 80mm mirror has an 800mm Focal Length.

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Q
Patricia, guest, from NM, United States, asked on June 08, 2019

Is this a three inch mirror that can be used on a North star telescope?

Expert Answer
A
Answered by Armando R., Gear Expert, from IL, United States, on October 19, 2019

Please contact the manufacturer of your telescope to confirm compatibility with these mirrors.

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Q
Ns521, guest, from OH, United States, asked on May 31, 2018

Is there a secondary mirror that fits this one?

Expert Answer
A
Answered by Ethan C., Gear Expert, from IL, United States, on August 15, 2018

Unfortunately we do not have any Cassini secondary mirrors.

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Q
Joe, guest, from GA, United States, asked on October 28, 2017

I need an 8 inch replacement reflector for an Orion intelliscope. Would this work?

Expert Answer
A
Answered by Carly R., Gear Expert, from IL, United States, on November 02, 2017

No, this would not work. We recommend contacting the manufacturer for replacement parts.

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Q
Frances, guest, from NY, United States, asked on September 30, 2017

Hi! are these mirrors blank or already ground?

Expert Answer
A
Answered by Carly R., Gear Expert, from IL, United States, on October 03, 2017

This unit is ready for use and is preset with a Collimation Dot and Ronchi tested for high reflectivity.

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