The Agony of Buying Your First Telescope Sorin SoggyAstronomer.com.

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Presentation transcript:

The Agony of Buying Your First Telescope Sorin SoggyAstronomer.com

Too Many Choices

Red Tasco Cheap options with bad optics can be tempting…

until you see the view.

Spending a bit more delivers a world of difference!

Three Fours 4 Key Terms 4 Questions 4 Types of Telescopes

4 KEY TERMS

Magnification 400x 200x 100x = Disappointment

Aperture 50mm 100mm 200mm 20 cm 2 78 cm cm 2 < 9mm

Aperture = Clarity 50mm 100mm 200mm 20 cm 2 33x 78 cm 2 130x 314 cm 2 514x < 9mm 1x

Focal Length The distance over which an optical system converges light

Field of View Longer Focal Length = Narrower FOV Shorter Focal Length = Wider FOV

3˚ 30 M51 Jupiter <1 Field of View

4 QUESTIONS

1. How much do you want to spend?

2. How far will you need to move your telescope to use it?

3. What do you really want to see?

4. Visual observing, or astrophotography? 4. Visual Observing or Astrophotography?

Image Credit: NASA

4 TYPES OF TELESCOPES

Schmidt-CassegrainsDobsonians RefractorsNewtonians

Refractors

Best For: Wide Field of View Terrestrial Observing Fast Cool Down Double Stars Be Aware Of: Cheap Mounts Chromatic Aberration High cost per inch at larger apertures

Newtonians

Good For: Planetary and Deep Sky Observing Astrophotography Be Aware Of: Complicated or Shaky Mounts Occasional Collimation Not as good for splitting double-stars Long Cool Down

Dobsonians

Schmidt-Cassegrains

Be Aware Of: More Expensive Than Newtonians & Dobs Narrowest FOV Long Cool Down Best For: Astrophotography Planetary and Deep Sky Objects Small Size for Large Aperture

GoTo vs. Manual Forces you to learn the sky No Alignment Process Cheaper Can point you to hard to find DSOs Tracks objects while observing

ASTROPHOTOGRAPHY

Image Credit: flurryofsmoke on Flickr You Dont Need Crazy Kit

A DSLR Camera is a great way to get started

Astrophotography is where GEMs Shine

JupiterM42 Orion Nebula AP does take patience… and a lot of practice.

Astrophotography Astrophotography is only as hard as you make it.

Yeah, ok, thats great… Now which telescope do I buy?

Four Key Terms Avoid Telescopes Advertising MagnificationAvoid Telescopes Advertising Magnification Larger Aperture = Better ClarityLarger Aperture = Better Clarity short Focal Length = Wide Field of Viewshort Focal Length = Wide Field of View LONG Focal Length = Narrow Field of ViewLONG Focal Length = Narrow Field of View

Four Questions 1. How much do you want to spend? 2. How far will you need to move your telescope to use it? 3. What do you really want to see? 4. Visual observing or Astrophotography?

Schmidt-CassegrainsDobsonians RefractorsNewtonians

Star Parties Attend a public Star Party

Join a Club

Thank You!

Appendix

Chromatic Aberration

Newtonian

Schmidt Cassegrain