Beginners’ Guide to Telescopes

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Pros & Cons

Strengths and weaknesses of different mount types

MOUNTS

Strengths

Weaknesses

Alt-azimuth

or altaz

Very intuitive — simple and quick to set-up and use

Harder to track objects to keep them in view

 

Generally quite portable

Cheaper types may be flimsy and prone to vibration

 

Generally inexpensive

May be unsuitable for astrophotography — can’t usually fit motor drive (except for ‘autotrak’ mounts or GO-TO types)

 

 

 

Dobsonian

or Dob

Lots of aperture for the money.

 

(Simple altaz stand with a Newtonian reflector)

Can be robust and less prone to vibration

Harder to track objects to keep them in view

 

 

Bulky and probably not lightweight

 

Can now buy ‘push-to’ Dobs with target guidance display on hand controller

‘Push-tos’ require careful alignment on set-up

 

 

Can’t fit motor drive.  Unsuitable for astrophotography

 

 

 

Equatorial Mount

or EQ

Easier to track targets and keep them in view

More complicated to set up — polar alignment required

 

Can be motorised for automatic tracking

More expensive than an alt-az.

 

Most suitable for astrophotography

Cheaper models may be flimsy.

Better quality models can be heavy (and much more expensive)

 

 

Telescope eye-piece, finder, and controls can get into a difficult position to use as you track across the sky during a session

 

 

 

GO-TO Mount

Easy to use once set-up.  Automatically finds and tracks objects in its database

Set up can be tricky.  Requires careful alignment (polar alignment and adjustment on reference stars) except in GPS/auto-align types (more expensive still)

 

Available with built-in GPS/auto alignment systems (at a price)

 

 

Very portable with smaller telescopes

More expensive