BT-70-45 review by Phil Harrington
... focal ratio might cause image-spoiling chromatic aberration (which breaks bright celestial targets into rainbows), especially when aimed at objects like Sirius, the Moon, or Jupiter. But the three-element objective lenses quickly alleviated my fears when I put the BT-70-45 to the test. The unit’s mo ...
... focal ratio might cause image-spoiling chromatic aberration (which breaks bright celestial targets into rainbows), especially when aimed at objects like Sirius, the Moon, or Jupiter. But the three-element objective lenses quickly alleviated my fears when I put the BT-70-45 to the test. The unit’s mo ...
July-August 2015 - Nottingham Astronomical Society
... Telescopes with very long focal lengths like the SCTs have a much narrower FoV and are therefore much better suited to observing (and imaging) apparently smaller objects such as planets and planetary nebula. The FoV a user experiences will not only depend upon the telescope being used but also on th ...
... Telescopes with very long focal lengths like the SCTs have a much narrower FoV and are therefore much better suited to observing (and imaging) apparently smaller objects such as planets and planetary nebula. The FoV a user experiences will not only depend upon the telescope being used but also on th ...
Applications of Optics - RosedaleGrade10Science
... 11 astronauts. With this device scientists have been able to shine a beam at the Moon bounce it off LR3 and determine the earth-moon distance to within a few millimetres. ...
... 11 astronauts. With this device scientists have been able to shine a beam at the Moon bounce it off LR3 and determine the earth-moon distance to within a few millimetres. ...
Click here to view Carolyn`s poster
... The first x-ray telescopes were launched in the 1970’s and the basic theory remains the same today, all x-ray telescopes are space borne, as x-rays from space do not penetrate the Earth’s atmosphere. An x-ray telescope works on the principle of external reflection, essentially an x-ray is ‘bounced’ ...
... The first x-ray telescopes were launched in the 1970’s and the basic theory remains the same today, all x-ray telescopes are space borne, as x-rays from space do not penetrate the Earth’s atmosphere. An x-ray telescope works on the principle of external reflection, essentially an x-ray is ‘bounced’ ...
ALMA band 9 optical layout
... A fundamental mode Gaussian beam propagation trough the system calculated by using (13) is shown in Figure 2.7. Gaussian beams are shown for 1w and 2.5w beam radii, input and output distances ( R1 , R 4 ) Mirrors should pass 5 w diameter beam in order to reduce truncation losses. The calculation was ...
... A fundamental mode Gaussian beam propagation trough the system calculated by using (13) is shown in Figure 2.7. Gaussian beams are shown for 1w and 2.5w beam radii, input and output distances ( R1 , R 4 ) Mirrors should pass 5 w diameter beam in order to reduce truncation losses. The calculation was ...
Engineering Lightweight Dobsonian Telescopes
... Secondary mirror size is a difficult choice. What you want overall is the smallest secondary you can get away with to catch all the available light from the main mirror, a minimum light obstruction, and adequate eyepiece illumination. The diameter and focal length of the eyepieces you want to use, a ...
... Secondary mirror size is a difficult choice. What you want overall is the smallest secondary you can get away with to catch all the available light from the main mirror, a minimum light obstruction, and adequate eyepiece illumination. The diameter and focal length of the eyepieces you want to use, a ...
1051-733-20092 Homework #6 Due 02/17/2010 (W)
... (off-axis) point on the object to the retina. (c) Calculate the magnifying power of the system. 5. A magnifying lens with focal length f = 60 mm is used to view an object by a person whose closest focus is 250 mm. If the person holds the glass close to the eye, determine the best position of the obje ...
... (off-axis) point on the object to the retina. (c) Calculate the magnifying power of the system. 5. A magnifying lens with focal length f = 60 mm is used to view an object by a person whose closest focus is 250 mm. If the person holds the glass close to the eye, determine the best position of the obje ...
Presentation - Center for Adaptive Optics
... Center for Adaptive Optics This project is funded in part by the National Science Foundation and Technology Center for Adaptive Optics, managed by the University of California at Santa Cruz AST# 9876783. ...
... Center for Adaptive Optics This project is funded in part by the National Science Foundation and Technology Center for Adaptive Optics, managed by the University of California at Santa Cruz AST# 9876783. ...
Joint Service General Purpose Mask (JSGPM) - Fosta
... Non-uniform surfaces refract light away from the focal point. ...
... Non-uniform surfaces refract light away from the focal point. ...
Wild T2 Universal Theodolite (www.wild
... The well-known Wild T2 Universal Theodolite is ideally suited for almost every type of survey task. In addition to its high accuracy, with direct reading, to single seconds, it is simple to handle, has a well-illuminated optical and reading system and can be used with a large variety of accessories ...
... The well-known Wild T2 Universal Theodolite is ideally suited for almost every type of survey task. In addition to its high accuracy, with direct reading, to single seconds, it is simple to handle, has a well-illuminated optical and reading system and can be used with a large variety of accessories ...
Manufacture of a 1.7 m prototype of the GMT primary mirror segments
... of these four fiducial points in a coordinate system centered on the mechanical center of the mirror. By a coordinate transformation we know their positions in a coordinate system centered on the vertex of the parent paraboloid, assuming the mirror has the correct radius of curvature, off-axis dist ...
... of these four fiducial points in a coordinate system centered on the mechanical center of the mirror. By a coordinate transformation we know their positions in a coordinate system centered on the vertex of the parent paraboloid, assuming the mirror has the correct radius of curvature, off-axis dist ...
The James Webb Space Telescope
... habitability) in the atmosphere of an extrasolar planet. Most of the infrared light from that planet would not reach the telescope because the water vapor in Earth’s atmosphere would absorb it. ...
... habitability) in the atmosphere of an extrasolar planet. Most of the infrared light from that planet would not reach the telescope because the water vapor in Earth’s atmosphere would absorb it. ...
ISNS3371_040307_bw - The University of Texas at Dallas
... The eye consists of pupil that allows light into the eye - it controls the amount of light allowed in through the lens - acts like a simple glass lens which focuses the light on the retina - which consists of light sensitive cells that send signals to the brain via the optic nerve. An eye with perfe ...
... The eye consists of pupil that allows light into the eye - it controls the amount of light allowed in through the lens - acts like a simple glass lens which focuses the light on the retina - which consists of light sensitive cells that send signals to the brain via the optic nerve. An eye with perfe ...
Unit 2 Optics
... dense medium (water) to a less dense medium (air) it speeds up - away from normal When light moves from a less dense medium (air) to a more dense medium (water) it slows down -toward the normal ...
... dense medium (water) to a less dense medium (air) it speeds up - away from normal When light moves from a less dense medium (air) to a more dense medium (water) it slows down -toward the normal ...
Highlights of the Poster Session - Indico
... Argentina (2x), Bolivia, France, Italy, Mexico (2), Venezuela GRB have not yet been detected with ground based detectors, only by satellites. Idea: Use Water Cherenkov Detectors in order to detect all secondaries (photons represent 80-90% of secondaries), but one needs to go to VERY high altitudes. ...
... Argentina (2x), Bolivia, France, Italy, Mexico (2), Venezuela GRB have not yet been detected with ground based detectors, only by satellites. Idea: Use Water Cherenkov Detectors in order to detect all secondaries (photons represent 80-90% of secondaries), but one needs to go to VERY high altitudes. ...
01 - University High School
... a. astronomy. b. the big bang. c. gravity. d. cosmology. _____ 10. Most astronomers agree that the universe began with the big bang, which was a a. gradual blooming of stars and planets. b. great dust swirl that appeared about 4 billion years ago. c. giant explosion that occurred about 14 billion ye ...
... a. astronomy. b. the big bang. c. gravity. d. cosmology. _____ 10. Most astronomers agree that the universe began with the big bang, which was a a. gradual blooming of stars and planets. b. great dust swirl that appeared about 4 billion years ago. c. giant explosion that occurred about 14 billion ye ...
1 Experiment #1: Reflection, Refraction, and Dispersion Purpose: To
... an oblique angle. Trace the surface of the mirror and the incident and reflected rays. Draw a tangent line to the mirror surface at the point of reflection (by allowing it to deviate away from the mirror equally in both directions) and then construct a line normal to the tangent line at the point of ...
... an oblique angle. Trace the surface of the mirror and the incident and reflected rays. Draw a tangent line to the mirror surface at the point of reflection (by allowing it to deviate away from the mirror equally in both directions) and then construct a line normal to the tangent line at the point of ...
Uranus Questions
... some of the other planets; they just didn't know that they were planets. By the time of the ancient Greeks, some logically-minded people had figured out that not everything up there was a star. Stars stayed in one place, but other heavenly bodies, such as planets, moved. In this way, they discovered ...
... some of the other planets; they just didn't know that they were planets. By the time of the ancient Greeks, some logically-minded people had figured out that not everything up there was a star. Stars stayed in one place, but other heavenly bodies, such as planets, moved. In this way, they discovered ...
Driving with Bioptic Telescopes
... occupational therapist. The evaluation will include a Useful Field of Vision test. The training will focus on the user’s ability to focus and demonstrate movement in and out of the bioptic within one to two seconds to spot distant targets. The goals are for the patient to be able to use the device e ...
... occupational therapist. The evaluation will include a Useful Field of Vision test. The training will focus on the user’s ability to focus and demonstrate movement in and out of the bioptic within one to two seconds to spot distant targets. The goals are for the patient to be able to use the device e ...
RPT-O-G0047 Gemini Telescopes f/16 Optical
... First, to reduce Petzval curvature and ease instrument design complexity, a small focal ratio was desirable. However, a small focal ratio would require a large secondary mirror when keeping the focal plane location constant. And as secondary mirrors increased in size, the problem of maintaining low ...
... First, to reduce Petzval curvature and ease instrument design complexity, a small focal ratio was desirable. However, a small focal ratio would require a large secondary mirror when keeping the focal plane location constant. And as secondary mirrors increased in size, the problem of maintaining low ...
Using Multilayer Optics to Measure X-ray Polarization Herman L. Marshall (MIT CSR)
... DS focal surface is not planar, so off-axis images have shape of aperture Predicted modulation factor: 4% Observed PKS 2155-304 for 200,000 s, getting 100,000 events ...
... DS focal surface is not planar, so off-axis images have shape of aperture Predicted modulation factor: 4% Observed PKS 2155-304 for 200,000 s, getting 100,000 events ...
Organization of the project
... Requirement is : “to not be destroyed”. • Thermal cycling will be performed. No switch-ON or operations outside the nominal temperature range is foreseen. • At each deliveries and before integration will be performed an acceptance test including documentation. • A test plan will be write for the int ...
... Requirement is : “to not be destroyed”. • Thermal cycling will be performed. No switch-ON or operations outside the nominal temperature range is foreseen. • At each deliveries and before integration will be performed an acceptance test including documentation. • A test plan will be write for the int ...
Reflecting telescope
A reflecting telescope (also called a reflector) is an optical telescope which uses a single or combination of curved mirrors that reflect light and form an image. The reflecting telescope was invented in the 17th century as an alternative to the refracting telescope which, at that time, was a design that suffered from severe chromatic aberration. Although reflecting telescopes produce other types of optical aberrations, it is a design that allows for very large diameter objectives. Almost all of the major telescopes used in astronomy research are reflectors. Reflecting telescopes come in many design variations and may employ extra optical elements to improve image quality or place the image in a mechanically advantageous position. Since reflecting telescopes use mirrors, the design is sometimes referred to as a ""catoptric"" telescope.