Charlie Haffey How To Buy Your First Telescope

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Presentation transcript:

Charlie Haffey How To Buy Your First Telescope 781-255-0229 chaffey@norwood.k12.ma.us www.norwood.k12.ma.us/sci

The Target User Child Adult Beginner Novice

What You Expect http://antwrp.gsfc.nasa.gov/apod/ap050428.html

What You Get http://antwrp.gsfc.nasa.gov/apod/ap050428.html

Types of Scopes Reflector Refractor

Reflector http://www.omni-optical.com/telescope/images/ut104-2scopes.gif

Refractor http://www.omni-optical.com/telescope/images/ut104-2scopes.gif

Types of Mounts Dobsonian Equatorial

Dobsonian Up and down Left and right www.astrostuff.com/ Swift_Telescopes.htm

Equatorial mount Rotates parallel to Earth’s axis Easier tracking of objects

Magnification http://www.celestron.com/tb-trms.htm

Focal Length

Calculate Magnification Focal length of telescope Focal length of eyepiece 1000 mm = 40 25 mm

Magnification Limits 40x most common Increase magnification- decrease field of view decrease brightness Over 100x rarely used very difficult tracking

Image Brightness Small increase in mirror diameter Large increase in surface area 6 inch mirror = 28 in2 area 8 inch mirror = 50 in2 area

Mr. Haffey Recommends Six inch Dobsonian $259 & up

The cheapest, easiest and best way to improve your first telescope...

Zero magnification finder EZ Finder™ II Reflex Sight $34.95

Upside is up finder Right Angle Correct-Image Finder Scopes $49.95 - $79.95

Do Not Buy 750 power! From a deli With unanswered questions

Do Buy Largest opening you can afford Move & use with comfort Reputable source

Vendors Orion Telescopes www.telescope.com Meade Telescopes www.meade.com Celestron Telescopes www.celestron.com The Camera Company www.cameraco.com 866-769-0210

After you buy your first telescope Contact Mr. Haffey First setup First use First light

Good Luck, Have Fun!