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National Geographic 114/900 AZ review

A 114/900 Newtonian on a simple alt-azimuth mount, supplied with three eyepieces, a 6x30 finder and a 1.5x erecting lens, recommended by the maker from age eight.

The bottom line A capable mirror on the simplest possible mount, advertised with a magnification figure eighteen times past what it can use.

Aperture, focal length, and the simple mount

A 114 mm mirror at 900 mm — f/7.9, the forgiving geometry. On an alt-azimuth head the whole instrument is ready the moment the tripod is level, which is exactly right for a telescope recommended from age eight.

Three eyepieces, and one of them is a trap

Twenty-five, nine and four millimetres. The first two are useful; the 4 mm gives 225x on its own, which is already at the aperture’s limit, and with the 1.5x erecting lens it reaches the 675x the listing advertises. That figure is arithmetic, not performance.

The finder is properly sized

A 6x30 is a real optical finder with a 30 mm objective. On a 900 mm telescope with a narrow field that matters more than on a short one, and cheaper sets in this class fit a 5x24 instead.

The mount’s honest limit

A long tube on a light alt-azimuth head amplifies every touch. Nudging rather than pushing, and letting the view settle, is the technique that makes this combination work.

Availability

German, French, Italian and Spanish Amazon stores ran from 142 € to 159 € on the day of the survey.

American and British Amazon stores list it in local currency, which the euro range above sets aside.

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.

What it publishes, and what it withholds

Strengths

  • An alt-azimuth mount has nothing to align, which suits the stated age
  • Three eyepieces plus an erecting lens cover both sky and landscape
  • f/7.9 on 114 mm is a forgiving and capable combination

Compromises

  • The quoted range of 36x to 675x has no basis in a 114 mm aperture at the top end
  • A 900 mm tube on a light alt-azimuth mount swings a long way when nudged
  • No payload or weight figure is published

Specifications

Payload ratingNot published by the maker.
Slow-motion controlNot published by the maker.
ClutchNot published by the maker.
TensionNot published by the maker.
Dovetail fittingNot published by the maker.
Tripod constructionAlt-azimuth with tripod
Setup timeNot published by the maker.
Supplied opticsNewtonian reflector · 114 mm (maker’s bullet) · 900 mm (maker’s bullet) · f/7.9, the quotient of the two figures above · 25 mm, 9 mm and 4 mm · 6x30
Amazon referenceB009X5QPM0 (same reference on 6 Amazon marketplaces)
EAN4007922201528

What observers ask about this one

Where does 675x come from?

From the 4 mm eyepiece with the erecting lens applied. The conventional ceiling for a 114 mm is around twice the aperture in millimetres; past that the image enlarges without adding detail.

Is alt-azimuth a disadvantage?

For visual use, rarely. Two controls instead of one, and the target drifts diagonally rather than along a single axis. What it loses in elegance it gains in there being nothing to set up.