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Practical Telescope Demo Evening Classes Week Five Downstairs in Physics Green.
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Transcript of Practical Telescope Demo Evening Classes Week Five Downstairs in Physics Green.
![Page 1: Practical Telescope Demo Evening Classes Week Five Downstairs in Physics Green.](https://reader036.fdocuments.us/reader036/viewer/2022062407/56649d0e5503460f949e4349/html5/thumbnails/1.jpg)
Practical Telescope Demo
Evening Classes
Week Five
Downstairs in Physics Green
![Page 2: Practical Telescope Demo Evening Classes Week Five Downstairs in Physics Green.](https://reader036.fdocuments.us/reader036/viewer/2022062407/56649d0e5503460f949e4349/html5/thumbnails/2.jpg)
Telescopes
Evening Classes
Week Five
Presented by Oisín Creaner
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Pupil
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The Eye at Night
The pupil widens to collect more light.
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The Eye at Night
7mm
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50mm x 50mm = 2,500mm2
7mm x 7mm = 49mm2
50mm binocularscollect 50 timesas much light asthe naked eye.
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Aperture
Typical values are 5cm for modest binocularsto 30cm or more for large telescopes
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Focal Length
Focal
Plane
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A second lens is used to re-diverge the rays.
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A second lens is used to re-diverge the rays.
The eyepiece is placed at the focal plane
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Binoculars
Point and look
Adjust for each eye
Useful on land, sea or sky!
Relatively inexpensive
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Refractors
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Refractors - Pros & Cons
• ADVANTAGES
• Simplicity - no maintenance.
• Suitable for terrestrial viewing.
• No obstruction = high contrast.
• Sealed tube - no air currents.
• DISADVANTAGES
• Very expensive in large apertures.
• Long, heavy & uncomfortable.
• Residual chromatic aberration.
• Long f-ratios unsuitable for photography.
![Page 14: Practical Telescope Demo Evening Classes Week Five Downstairs in Physics Green.](https://reader036.fdocuments.us/reader036/viewer/2022062407/56649d0e5503460f949e4349/html5/thumbnails/14.jpg)
Telescopes
Evening Classes
Week Five
Presented by Oisín Creaner
![Page 15: Practical Telescope Demo Evening Classes Week Five Downstairs in Physics Green.](https://reader036.fdocuments.us/reader036/viewer/2022062407/56649d0e5503460f949e4349/html5/thumbnails/15.jpg)
Reflectors
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Newtonian Reflector
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Open-end of a reflector
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Reflectors - Pros & Cons
ADVANTAGES • Low cost for size• No chromatic
aberration.• Compact &
ergonomic.• Short f-ratios
possible.• Optically simple.• Can be built very
large.
DISADVANTAGES • Obstruction = loss of
contrast.• Only suitable for
astronomy.• Open tube = air
currents.• Mirrors tarnish &
need re-coating.• Need maintance,
esp. collimation.• Off axis coma.
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Schmidt-CassegrainReflector
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Light-path in a Schmitd-Cassegrain Reflector
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Catadioptrics - Pros & Cons
• ADVANTAGES
• Best of both worlds• Large mirrors
available• Suitable for terrestrial
viewing.• Extremely Compact• Sealed tube - no air
currents.
• DISADVANTAGES
• Can be expensive.• Obstruction = loss of
contrast.• Long f-ratios
unsuitable for photography.
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Alt-azimuth Mount
Dobsonian
Fork
Point and shoot
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Equatorial Mount
Manual
Motorised
GoTo
Photography
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Eyepieces
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Eyepieces
SWA Apparent field 82°
Plossl Apparent field 52°
Kellner Apparent field 40°
Real field = Apparent field/Magnification
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Telescope FL Eyepiece Mag. App.field Real fieldKellner 2000mm 25mm 80x 40° 30 arc minPlossl 2000mm 25mm 80x 52° 39 arc minSWA 2000mm 25mm 80x 80° 1°
1°39 arc min30 arc
min
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Barlow Lens
40mm - 20mm
32mm - 16mm
26mm - 13mm
20mm- 10mm
12mm - 6mm
9mm- 4.5mm
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What can I see?
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More like this
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Appearance of Venus
(1)Inferior conjunction
(2)Greatest westernelongation
(1)
(2)
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Detail on the moon
•Craters
•Maria
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Deep Sky Objects
•Clusters
•Galaxies
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Thank You
www.astronomy.ie/handoutswww.stellarium.org
Useful websites