Observing
A telescope at ordinary magnification shows a patch of sky smaller than the Moon. Finding anything in it is the skill most beginners lack and most listings ignore. A good finder, a low-power eyepiece and a map of the sky do more than any optics upgrade.
Find everything with the longest eyepiece first. It shows the widest field, and a target that is anywhere in it can be centered and then magnified.
A red dot finder such as Celestron’s StarPointer shows the sky at 1x with a dot on it: put the dot on the target and the telescope points there. A 9x50 optical finder shows stars too faint for the eye, so you can hop from a bright star to a faint one.
Most finders flip or mirror the view, which makes a chart hard to follow. Astromania’s 9x50 correct-image finder and Explore Scientific’s 8x50 illuminated finder show the sky as the chart does; the second adds a 6-degree field with scale marks and an illuminated reticle.
Celestron’s StarSense Explorer DX 130 reads the stars through a docked phone and shows arrows to the target. It is the fastest way from box to Saturn for a beginner.
A planetarium projector such as the Thames & Kosmos shows the real constellations on a ceiling. A child, or an adult, who has found Orion indoors finds it outdoors faster.
The Moon and the brightest planets are found without any method. That is the right place to begin.
Moving from a bright star to the target: the classic method, and it needs a usable finder.
The stated procedure varies from one mount to another. This site publishes none.
| The target | The difficulty | What helps |
|---|---|---|
| The Moon | None | Nothing |
| Bright planets | Low | A finder |
| Clusters | Moderate | Wide field |
| Galaxies | High | A dark sky |
A finder drifts out of alignment with every knock and every transport. Realigning it takes two minutes by day and saves an evening.
This site publishes stated specifications and describes no observing session.
Right-side-up 1x view · adjustable red dot · mounting base and CR2032 included · 2-year US warranty
Celestron's StarPointer: a 1x red dot finder that keeps the sky right side up and correct left to right, with adjustable brightness, a mounting base and a CR2032 battery included.
Best for: A Celestron telescope that lost its finder, where the base and battery need replacing too
≈ $24
9x50 · right angle, correct image · fully multi-coated · crosshair reticle · Synta-style dovetail bracket
Astromania's 9x50 right-angle correct-image finder: fully multi-coated, with a crosshair reticle, objective focusing, two-screw-and-spring alignment and a Synta-style dovetail bracket.
Best for: Star-hopping from a printed chart on a telescope that points near the zenith
≈ $87
8x50 · 6° field · correct image (roof prism) · red illuminated open-center reticle · 16 mm eye relief · 15.9 oz
Explore Scientific's 8x50 illuminated straight-through finder: a 6-degree field, a roof prism for an upright correct image, a red illuminated open-center measuring reticle, 16 mm eye relief and EMD coatings, with bracket.
Best for: Centering faint objects, where a dark crosshair on a dark sky is unusable
≈ $180
130 mm (5.1 in) Newtonian · StarSense smartphone sky recognition · manual alt-azimuth with slow motion on both axes
Celestron's StarSense Explorer DX 130AZ: a 130 mm Newtonian on a manual alt-azimuth mount with dual-axis slow motion, whose phone dock and app read the stars overhead and guide the observer to a target.
Best for: A beginner who wants to see things this month rather than learn to star-hop first
≈ $500
Two projectors in one · star maps for both hemispheres · four James Webb image disks · 6-inch dome · auto-off at 15, 30 or 60 min
Thames & Kosmos's Planetarium Projector: a 6-inch dual-mode unit with a rotating star-map dome for the northern and southern hemispheres plus a constellation map, a second projector with four James Webb image disks, and a timed night-light mode.
Best for: A bedroom ceiling that should show the sky it is actually under
≈ $32
Both, if possible. A red dot shows the sky at 1x for rough aiming; a 9x50 optical finder shows fainter stars for the last step.
Charts show the sky upright. A finder that inverts or mirrors the view makes matching it to a chart confusing. Correct-image finders show it as the chart does.
No. StarSense and similar systems teach the sky as they guide, and they remove the frustration that makes many beginners give up.
For observing: A Celestron telescope that lost its finder, where the base and battery need replacing too
Where it is strong: Base and battery in the box
Where it is weak: Alignment controls not described
For observing: Star-hopping from a printed chart on a telescope that points near the zenith
Where it is strong: Correct image: what you see matches a star chart
Where it is weak: No true field published
For observing: Centering faint objects, where a dark crosshair on a dark sky is unusable
Where it is strong: Illuminated open-center reticle: centers a faint object without hiding it
Where it is weak: Straight-through: awkward when the telescope points high
For observing: A beginner who wants to see things this month rather than learn to star-hop first
Where it is strong: StarSense finds targets from the stars overhead
Where it is weak: About $200 more than a 130 mm without StarSense
For observing: A bedroom ceiling that should show the sky it is actually under
Where it is strong: Real star maps for both hemispheres
Where it is weak: No room size or throw distance published
$11 – $24
7 models
$32 – $180
9 models
$180 – $500
7 models
The models above are taken from the catalog of this site. Specifications are the ones the maker publishes and the ones on the Amazon page; prices are the Keepa reading for the date shown, and both change. Ranking uses declared specifications, the weight of stated strengths against stated limits, and price. Nothing here has been pointed at the sky by us, and the page makes no such claim.
Last checked on
Any figure written into the body of this page was true on the day it was written. The amount shown next to each instrument is requested from the retailer as the page loads, and it is that amount, not the text, that stands.
