70–90 mm refractor on a manual equatorial mount
Meade Polaris 90 EQ
A long achromatic refractor on a small equatorial mount with a counterweight. The tube is the one also sold on an alt-az tripod; the mount follows the sky with one knob once it points at the celestial pole, and it is harder to learn and slower to set up than the tube needs.
€279seen 7 Oct 2026 at Astroshop
- 90 mmAperture
- f/10.0Focal ratio
- 12 kgTypical weight
- 15–180×Useful magnification
Should you buy it?
- No if your priority is nebulae, clusters and galaxies, by eye, learn my way around the sky, sharing it with children, taking it with me, first astrophotography, serious deep-sky imaging: other families do better for the same money.
Computed from its family's per-goal scores and its own numbers — not a rating, not one evening's opinion.
Where to buy
Also search at First Light Optics · Optique Unterlinden · Pierro Astro · Teleskop-Express (searches; neither price nor stock checked)
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Prices are observed on the date shown, never live. Links marked paid link earn us a commission and cost you nothing extra.
What it shows, really
These circles are simulations, computed from the aperture, the magnification and the sky — indicative, not exact. A real night also depends on the turbulence, your eyes and your experience. Closer to the truth than the photo on the box; still not a promise.
Under a suburban sky (Bortle 6), through a common 25 mm eyepiece for wide targets and a 10 mm for planets. Every circle is the true field — nothing is enlarged.
Photo credits
These thumbnails are built from real photographs, scaled and darkened by the same arithmetic as the large view.
The numbers
Photo: Astroshop| Aperture | 90 mm |
|---|---|
| Focal ratio | 900 mm · f/10.0 |
| Mount | EQ-1 manual equatorial on a steel tripod |
| Typical weight | 12 kg |
| Eyepieces | 25 mm, 9 mm and 6.3 mm |
| Useful magnification | 15× to 180× at 90 mm |
| Resolution (Dawes) | 1.3″ — the tightest double star this aperture can split |
| Faintest star, suburban sky | around magnitude 11.0 |
| Observed price | €279 seen 7 Oct 2026 at Astroshop |
Made for
- The Sun
In white light: sunspots with their penumbra, faculae near the edge, and granulation on a steady morning. Dawes' limit on the Sun: 1.3″ (116 ÷ 90 mm, arithmetic). Measure the outside diameter first, then one of: Omegon Helievo 92 (84–108 mm), Omegon Helievo 112 (104–128 mm), Omegon Helievo 132 (124–148 mm) (€59–€79). Every time: certified filter over the front · finder capped · never an eyepiece filter · an adult with children · never without the filter · measure first.
Not made for
- Nebulae, clusters and galaxies, by eye
Bright clusters and the Orion Nebula. Galaxies are mostly out of reach: 90 mm gathers about half the light of a 130 mm, arithmetic.
- Learn my way around the sky
It teaches the celestial coordinates, a real skill, but star-hopping from a chart is slower than on a mount that moves up-down and left-right.
- Sharing it with children
An adult aligns it and points it. As a long tube swings round the pole the eyepiece climbs and drops, and the counterweight bar sits at a child's head height (experience).
- Taking it with me
A 90 cm tube, a tripod and a head with its counterweight: a car, not a plane.
- First astrophotography
A phone at the eyepiece on the Moon. Not long exposures: the head is too light to carry a camera steadily (experience), and an f/10 achromat puts a violet halo round bright stars.
- Serious deep-sky imaging
No. A slow achromat on a light manual head is not an imaging instrument.
The Sun, safely
No solar filter in the box
The Sun with this model
No source we have states the outside diameter of its tube or dew shield. Measure it at the front, then take the cell whose range holds it. For 90 mm of aperture, one of these:
In white light: sunspots with their penumbra, faculae near the edge, and granulation on a steady morning. Dawes' limit on the Sun: 1.3″ (116 ÷ 90 mm, arithmetic).
- Omegon Helievo 92 (84–108 mm): holds 84–108 mm, €59 (seen 26 Sept 2026) Astroshoppaid link
- Omegon Helievo 112 (104–128 mm): holds 104–128 mm, €69 (seen 26 Sept 2026) Astroshoppaid link
- Omegon Helievo 132 (124–148 mm): holds 124–148 mm, €79 (seen 26 Sept 2026) Astroshoppaid link
The listing names no standard; no international standard exists for filters on telescopes, binoculars or lenses (AAS).
Every time
- A certified solar filter over the FRONT of the instrument, fastened so it cannot slip or blow off.
- Cap or remove the finder. It is a second telescope, and it has no filter.
- Never a filter at the eyepiece end: the concentrated sunlight there can crack it in an instant.
- With children, an adult is there every time.
- Never look, or point, without the filter on. Check it before each use; a scratched or torn filter goes in the bin.
- Measure before ordering. A cell that sits loose can fall off.
Sources for the Sun
- American Astronomical Society — How to View a Solar Eclipse Safely — filters on optics go on the front; eclipse glasses never with optics; children supervised
- American Astronomical Society — Solar Filters for Optics — eyepiece filters are dangerous; the finder capped, removed or filtered; the filter attached securely
- American Astronomical Society — About the ISO 12312-2 Standard — EN ISO 12312-2:2015 covers naked-eye viewers only; no international standard covers filters on telescopes, binoculars or lenses
- Société astronomique de France — Guide des observations solaires — a filter at the front, never one screwed into the eyepiece, the finder capped
- NASA — Keep Your Eclipse Glasses to See the Sun's ‘Freckles’ — a large enough sunspot shows through eclipse glasses
- AAVSO — Le Guide d'Observation Solaire de l'AAVSO, v1.1 (2017), p. 6 — archived copy — “Les ouvertures plus grandes que 100 à 125 mm sont généralement limitées par les effets de turbulence atmosphérique”; 50 to 80 mm is enough to count sunspots
The family it belongs to: 70–90 mm refractor on a manual equatorial mount
What it does well
- Sealed tube: no collimation, ever
- Once the mount is aligned roughly on the pole, one slow-motion knob follows a planet at high power
- At f/10 the violet fringe around the Moon and bright planets stays small for an achromat
What it costs you
- 70–90 mm is not much light: a 90 mm gathers (90 ÷ 130)² ≈ 0.48 of a 130 mm's, arithmetic. Deep sky is a short list
- Pointed high, a 90 cm tube on an equatorial head puts the eyepiece low, down among the tripod legs
- About 12 kg in three pieces, and a rough alignment on the pole every night
Worth knowing about this model
The spec table lists an EQ-1 head for a 900 mm tube. The 6.3 mm eyepiece gives 143× on 90 mm, an exit pupil of 0.63 mm; with the 2× Barlow in the box, 286× and 0.3 mm, well past the 180× that 90 mm can use. 12 kg in all.
Everything about 70–90 mm refractor on a manual equatorial mount →
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€279seen 7 Oct 2026 at Astroshop
Where to buy