The Gregorian telescope is named after the James Gregory design which appeared in his 1663 publication Optica Promota (The Advance of Optics). Similar theoretical designs have been found in the writings of Bonaventura Cavalieri (Lo Specchio Ustorio (On Burning Mirrors), 1632) and Marin Mersenne (L'harmonie universalle, 1636). Gregory's early attempts to build the telescope failed, since he had no practical skill himself and he could find no optician capable of actually constructing one. It was not until ten years after Gregory's publication, aided by the interest of experimental scientist Robert Hooke, that a working instrument was created. The early Scottish optician and telescope maker James Short built Gregorian telescopes with parabolic mirrors made from the highly reflective speculum metal.
Test #2 of the movie-machine on small obect (8" tall )
published: 05 Jul 2020
Geometry of Gregorian Telescope
http://demonstrations.wolfram.com/GeometryOfGregorianTelescope
The Wolfram Demonstrations Project contains thousands of free interactive visualizations, with new entries added daily.
This Demonstration shows the principle of a telescope designed by the Scottish mathematician and astronomer James Gregory in the seventeenth century; it was first built in 1673 by Robert Hooke. The parameters a and b are the semiaxes of the ellipse, and...
Contributed by: Izidor Hafner
Audio created with WolframTones:
http://tones.wolfram.com
published: 31 Mar 2017
Reflective Telescopes
Deepen your knowledge of first-order, paraxial system design and optical resolution and efficiency with an introduction to real lenses and their imperfections in this course offered as part of CU on Coursera's Optical Engineering specialization. Learn more at https://www.colorado.edu/oai/optical-engineering-specialization
published: 14 Aug 2020
Telescope Gregorian Overview
A quick overview of a telescope that uses a F-4.5, 13.1 inch mirror and a F-4 four inch mirror. see badbobastronomer youtube channel for more info about Gregorian telescopes.
https://www.youtube.com/watch?v=VK9MmZ7lReU
published: 21 May 2016
Animate It - Gregorian Telescope
Lynn Atkin presents a Gregorian Telescope from the Museum of the History of Science collection (inv. 90369).
This film was made as part of the Animate It project to film hands-on demonstrations of objects in the Museum.
www.mhs.ox.ac.uk/animateit
published: 08 Jan 2016
How To Construct A Gregorian Telescope Part Two
This is the second in a short series of videos in which I describe how to construct a Gregorian reflecting telescope. There is one thing that I forgot to mention in the video; in order to properly make the two baffle tubes, it is a good idea to make a scale drawing of the telescope optical system; you must decide on the maximum width of the field of view at the final Gregorian focus, for example, two inches (this will allow you to use two-inch eyepieces to get reasonably low powers); then draw your light baffles to scale so that no stray background sky light can enter that field of view; you must take care that the front end of the baffle tube nearest the primary mirror is not too large relative to the converging cone of light from the primary mirror.
published: 11 Mar 2016
Telescope moon coulter eyepiece 13.1 inch
This is a short vid about my F4.5 13.1coulter telescope. It is an alt azimuth rotation mount. See the Lens Finder Surplus Shed and then badbobastronomer for a cool Gregorian telescope.
published: 24 Jan 2016
How To Construct A Gregorian Telescope Part One
This is the first of several videos in which I describe how a Gregorian reflecting telescope works. I should mention that the large spot of ink near the bottom of the diagram is where I originally drew an arrow in the wrong direction and then I covered it with ink. I forgot to mention in the video that, if you decide to construct a Gregorian, do not drill a hole in the primary mirror; achieve the final focus "C" by using the small flat mirror; if you drill a hole in the primary mirror (especially after it has already been accurately polished), you will likely damage or destroy the primary mirror. In the video I mentioned that two spiders would be needed; actually, as many as four spiders might be needed, in order to solidly support the long light baffles; I would recommend that the spider ...
http://demonstrations.wolfram.com/GeometryOfGregorianTelescope
The Wolfram Demonstrations Project contains thousands of free interactive visualizations, with n...
http://demonstrations.wolfram.com/GeometryOfGregorianTelescope
The Wolfram Demonstrations Project contains thousands of free interactive visualizations, with new entries added daily.
This Demonstration shows the principle of a telescope designed by the Scottish mathematician and astronomer James Gregory in the seventeenth century; it was first built in 1673 by Robert Hooke. The parameters a and b are the semiaxes of the ellipse, and...
Contributed by: Izidor Hafner
Audio created with WolframTones:
http://tones.wolfram.com
http://demonstrations.wolfram.com/GeometryOfGregorianTelescope
The Wolfram Demonstrations Project contains thousands of free interactive visualizations, with new entries added daily.
This Demonstration shows the principle of a telescope designed by the Scottish mathematician and astronomer James Gregory in the seventeenth century; it was first built in 1673 by Robert Hooke. The parameters a and b are the semiaxes of the ellipse, and...
Contributed by: Izidor Hafner
Audio created with WolframTones:
http://tones.wolfram.com
Deepen your knowledge of first-order, paraxial system design and optical resolution and efficiency with an introduction to real lenses and their imperfections i...
Deepen your knowledge of first-order, paraxial system design and optical resolution and efficiency with an introduction to real lenses and their imperfections in this course offered as part of CU on Coursera's Optical Engineering specialization. Learn more at https://www.colorado.edu/oai/optical-engineering-specialization
Deepen your knowledge of first-order, paraxial system design and optical resolution and efficiency with an introduction to real lenses and their imperfections in this course offered as part of CU on Coursera's Optical Engineering specialization. Learn more at https://www.colorado.edu/oai/optical-engineering-specialization
A quick overview of a telescope that uses a F-4.5, 13.1 inch mirror and a F-4 four inch mirror. see badbobastronomer youtube channel for more info about Gregori...
A quick overview of a telescope that uses a F-4.5, 13.1 inch mirror and a F-4 four inch mirror. see badbobastronomer youtube channel for more info about Gregorian telescopes.
https://www.youtube.com/watch?v=VK9MmZ7lReU
A quick overview of a telescope that uses a F-4.5, 13.1 inch mirror and a F-4 four inch mirror. see badbobastronomer youtube channel for more info about Gregorian telescopes.
https://www.youtube.com/watch?v=VK9MmZ7lReU
Lynn Atkin presents a Gregorian Telescope from the Museum of the History of Science collection (inv. 90369).
This film was made as part of the Animate It proje...
Lynn Atkin presents a Gregorian Telescope from the Museum of the History of Science collection (inv. 90369).
This film was made as part of the Animate It project to film hands-on demonstrations of objects in the Museum.
www.mhs.ox.ac.uk/animateit
Lynn Atkin presents a Gregorian Telescope from the Museum of the History of Science collection (inv. 90369).
This film was made as part of the Animate It project to film hands-on demonstrations of objects in the Museum.
www.mhs.ox.ac.uk/animateit
This is the second in a short series of videos in which I describe how to construct a Gregorian reflecting telescope. There is one thing that I forgot to mentio...
This is the second in a short series of videos in which I describe how to construct a Gregorian reflecting telescope. There is one thing that I forgot to mention in the video; in order to properly make the two baffle tubes, it is a good idea to make a scale drawing of the telescope optical system; you must decide on the maximum width of the field of view at the final Gregorian focus, for example, two inches (this will allow you to use two-inch eyepieces to get reasonably low powers); then draw your light baffles to scale so that no stray background sky light can enter that field of view; you must take care that the front end of the baffle tube nearest the primary mirror is not too large relative to the converging cone of light from the primary mirror.
This is the second in a short series of videos in which I describe how to construct a Gregorian reflecting telescope. There is one thing that I forgot to mention in the video; in order to properly make the two baffle tubes, it is a good idea to make a scale drawing of the telescope optical system; you must decide on the maximum width of the field of view at the final Gregorian focus, for example, two inches (this will allow you to use two-inch eyepieces to get reasonably low powers); then draw your light baffles to scale so that no stray background sky light can enter that field of view; you must take care that the front end of the baffle tube nearest the primary mirror is not too large relative to the converging cone of light from the primary mirror.
This is a short vid about my F4.5 13.1coulter telescope. It is an alt azimuth rotation mount. See the Lens Finder Surplus Shed and then badbobastronomer for a ...
This is a short vid about my F4.5 13.1coulter telescope. It is an alt azimuth rotation mount. See the Lens Finder Surplus Shed and then badbobastronomer for a cool Gregorian telescope.
This is a short vid about my F4.5 13.1coulter telescope. It is an alt azimuth rotation mount. See the Lens Finder Surplus Shed and then badbobastronomer for a cool Gregorian telescope.
This is the first of several videos in which I describe how a Gregorian reflecting telescope works. I should mention that the large spot of ink near the bottom ...
This is the first of several videos in which I describe how a Gregorian reflecting telescope works. I should mention that the large spot of ink near the bottom of the diagram is where I originally drew an arrow in the wrong direction and then I covered it with ink. I forgot to mention in the video that, if you decide to construct a Gregorian, do not drill a hole in the primary mirror; achieve the final focus "C" by using the small flat mirror; if you drill a hole in the primary mirror (especially after it has already been accurately polished), you will likely damage or destroy the primary mirror. In the video I mentioned that two spiders would be needed; actually, as many as four spiders might be needed, in order to solidly support the long light baffles; I would recommend that the spider vanes be reasonably accurately lined up with each other, in order to minimize the number of diffraction flares on bright star images.
This is the first of several videos in which I describe how a Gregorian reflecting telescope works. I should mention that the large spot of ink near the bottom of the diagram is where I originally drew an arrow in the wrong direction and then I covered it with ink. I forgot to mention in the video that, if you decide to construct a Gregorian, do not drill a hole in the primary mirror; achieve the final focus "C" by using the small flat mirror; if you drill a hole in the primary mirror (especially after it has already been accurately polished), you will likely damage or destroy the primary mirror. In the video I mentioned that two spiders would be needed; actually, as many as four spiders might be needed, in order to solidly support the long light baffles; I would recommend that the spider vanes be reasonably accurately lined up with each other, in order to minimize the number of diffraction flares on bright star images.
http://demonstrations.wolfram.com/GeometryOfGregorianTelescope
The Wolfram Demonstrations Project contains thousands of free interactive visualizations, with new entries added daily.
This Demonstration shows the principle of a telescope designed by the Scottish mathematician and astronomer James Gregory in the seventeenth century; it was first built in 1673 by Robert Hooke. The parameters a and b are the semiaxes of the ellipse, and...
Contributed by: Izidor Hafner
Audio created with WolframTones:
http://tones.wolfram.com
Deepen your knowledge of first-order, paraxial system design and optical resolution and efficiency with an introduction to real lenses and their imperfections in this course offered as part of CU on Coursera's Optical Engineering specialization. Learn more at https://www.colorado.edu/oai/optical-engineering-specialization
A quick overview of a telescope that uses a F-4.5, 13.1 inch mirror and a F-4 four inch mirror. see badbobastronomer youtube channel for more info about Gregorian telescopes.
https://www.youtube.com/watch?v=VK9MmZ7lReU
Lynn Atkin presents a Gregorian Telescope from the Museum of the History of Science collection (inv. 90369).
This film was made as part of the Animate It project to film hands-on demonstrations of objects in the Museum.
www.mhs.ox.ac.uk/animateit
This is the second in a short series of videos in which I describe how to construct a Gregorian reflecting telescope. There is one thing that I forgot to mention in the video; in order to properly make the two baffle tubes, it is a good idea to make a scale drawing of the telescope optical system; you must decide on the maximum width of the field of view at the final Gregorian focus, for example, two inches (this will allow you to use two-inch eyepieces to get reasonably low powers); then draw your light baffles to scale so that no stray background sky light can enter that field of view; you must take care that the front end of the baffle tube nearest the primary mirror is not too large relative to the converging cone of light from the primary mirror.
This is a short vid about my F4.5 13.1coulter telescope. It is an alt azimuth rotation mount. See the Lens Finder Surplus Shed and then badbobastronomer for a cool Gregorian telescope.
This is the first of several videos in which I describe how a Gregorian reflecting telescope works. I should mention that the large spot of ink near the bottom of the diagram is where I originally drew an arrow in the wrong direction and then I covered it with ink. I forgot to mention in the video that, if you decide to construct a Gregorian, do not drill a hole in the primary mirror; achieve the final focus "C" by using the small flat mirror; if you drill a hole in the primary mirror (especially after it has already been accurately polished), you will likely damage or destroy the primary mirror. In the video I mentioned that two spiders would be needed; actually, as many as four spiders might be needed, in order to solidly support the long light baffles; I would recommend that the spider vanes be reasonably accurately lined up with each other, in order to minimize the number of diffraction flares on bright star images.
The Gregorian telescope is named after the James Gregory design which appeared in his 1663 publication Optica Promota (The Advance of Optics). Similar theoretical designs have been found in the writings of Bonaventura Cavalieri (Lo Specchio Ustorio (On Burning Mirrors), 1632) and Marin Mersenne (L'harmonie universalle, 1636). Gregory's early attempts to build the telescope failed, since he had no practical skill himself and he could find no optician capable of actually constructing one. It was not until ten years after Gregory's publication, aided by the interest of experimental scientist Robert Hooke, that a working instrument was created. The early Scottish optician and telescope maker James Short built Gregorian telescopes with parabolic mirrors made from the highly reflective speculum metal.
It will be custom crafted to accommodate the GiantMagellanTelescope, which officials have said will be the largest Gregorian optical-infrared telescope in history capable of improving science's understanding of the universe.