A sealed tube, a lens at the front, and colour to account for · review
A 70 mm refractor on an alt-azimuth mount, supplied with two eyepieces, a 2x Barlow, a 6x24 finder and a star diagonal.
The bottom line A modern-fitting 70 mm whose own listing cannot agree on its focal length — worth checking the tube before ordering an eyepiece.
The title describes the instrument as 70 mm at f/700; one of the supplied-items bullets describes a 70 mm f/900 refractor. Both come from the same listing. That difference changes every magnification the set produces, and it is exactly the sort of figure this site refuses to average or to guess. Read the tube.
Everything supplied is 1.25 in: the two eyepieces, the diagonal, the Barlow. That is the size the whole modern accessory market is built on, and it is the difference between a telescope that can be improved and one that is finished on the day it arrives.
Two eyepieces with a 2x Barlow give four combinations, which is what the maker’s magnification list counts. Divide whichever focal length proves correct by 25 and by 10, then halve the eyepiece figure for the Barlow. The arithmetic belongs to the reader.
The maker states 36 % more light than a 60 mm. That is the ratio of the two areas, and it is true of any 70 mm compared with any 60 mm. It says nothing specific about this objective.
German, French, Italian and Spanish Amazon stores ran from 171 € to 193 € on the day of the survey.
American and British Amazon catalogues hold a record for it that nobody is selling.
Figures as Keepa reported them on the day this page was last updated. Stock and pricing shift without warning.
Prices quoted in this text were read on 17 September 2026. The live price is at the top of the page.
| Aperture | 70 mm (title and bullet agree) |
|---|---|
| Focal length and ratio | The title says f/700; a supplied-items bullet says 70 mm f/900 — both are reproduced here, neither is chosen |
| Lens design | Refractor, multi-coated objective per the maker’s bullet |
| Glass type | Not published by the maker. |
| Focuser | Not published by the maker. |
| Drawtube | Not published by the maker. |
| Tube weight | Aluminium |
| Supplied accessories | 10 mm and 25 mm, 1.25 in · 6x24 · 2x Barlow, 1.25 in star diagonal, alt-azimuth mount, aluminium tripod with accessory tray |
| Amazon reference | B0017GXFXU (same reference on 6 Amazon marketplaces) |
| EAN | 4049467050001 |
The listing gives both 700 mm and 900 mm in different places. This page reports the contradiction rather than resolving it; the figure printed on the tube or in the manual is the one to trust.
Everything about what comes next. That is the size almost every modern eyepiece, filter and diagonal is made in, so the telescope can be improved rather than replaced.
70 mm aperture · 400 mm focal length in the title
A 70/400 refractor sold with two eyepieces, a 5x Barlow, a phone adapter and a stainless-steel tripod — and a listing whose own bullets contradict its title.
Best for: A buyer who will check the tube’s printed figures before ordering anything else for it
≈ £79 / €70
70 mm aperture · 400 mm focal length
A 70/400 refractor sold as a first instrument for children from eight, supplied in a backpack with three eyepieces, a star diagonal and an erecting lens.
Best for: A child from about eight who will carry the telescope themselves
≈ £78 / €63
80 mm aperture · 600 mm focal length
An 80/600 refractor on an alt-azimuth head, supplied with two eyepieces, a 5x24 finder, a phone adapter and a backpack.
Best for: A first 80 mm that has to travel in a rucksack
≈ $100 / £70 / €130
