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DÖRR DELTA 1000 review

A 114/1000 Newtonian on an EQ-1 equatorial mount, supplied with four eyepieces, a 2x Barlow, a 5x24 finder and a Moon filter.

The bottom line A long-ratio 114 mm with a generous eyepiece set, carried by a mount at the limit of what the tube asks of it.

Aperture, focal length and the ratio between them

One hundred and fourteen millimetres and one thousand millimetres, giving f/8.8. That is the classic beginner’s Newtonian geometry: enough aperture to show the Moon in detail and the brighter planets as discs, and a ratio long enough that inexpensive eyepieces still behave.

Four eyepieces is a real advantage

Most sets ship with two. Four, plus a 2x Barlow, means the magnification steps are already covered and the next purchase can be a better diagonal or a filter rather than more glass. Whether any single one of them is excellent is another question, and the listing does not publish their designs.

Where the 500x claim comes from

The shortest supplied eyepiece with the Barlow. It is arithmetic, and the aperture cannot support it — past its resolving limit a telescope enlarges a blur. The figures at the top of this page are the ones that describe the instrument.

The mount is the compromise

An EQ-1 under a 1000 mm tube is working hard. It will track once aligned, and it will also transmit every touch of the focuser into the view. Damping time, not optical quality, is what will decide how high a magnification this set can actually hold.

Availability

German, French and Italian Amazon stores ran from 259 € to 336 € on the day of the survey.

British Amazon store lists it in local currency, which the euro range above sets aside.

Spanish Amazon catalogue holds a record for it that nobody is selling.

American Amazon store gave no result whatever, so the buy button there opens a search rather than an empty page.

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

  • f/8.8 is forgiving of simple eyepieces and shows less coma at the field edge
  • Four eyepieces plus a Barlow is an unusually broad supplied range
  • Flexible cables allow fine adjustment without touching the tube

Compromises

  • The EQ-1 is the lightest mount in the equatorial series, and a 1000 mm tube is a long lever on it
  • The maker advertises magnification “up to 500x”, which a 114 mm cannot usefully deliver
  • No transmission figure is published for the supplied Moon filter

Specifications

Aperture114 mm (title and bullet agree)
Focal length and ratio1000 mm (title and bullet agree) · f/8.8, the quotient of the two figures above
Optical designNewtonian reflector
Mirror coatingNot published by the maker.
Secondary obstructionNot published by the maker.
Focuser typeNot published by the maker.
Tube lengthNot published by the maker.
Collimation accessNot published by the maker.
Mount suppliedEQ-1 equatorial with flexible slow-motion cables
Supplied accessoriesFour, per the maker · 2x Barlow, 5x24 finder, Moon filter, aluminium tripod with accessory tray
Amazon referenceB0CFF4JP29 (same reference on 5 Amazon marketplaces)
EAN4000461102332

What observers ask about this one

Is 500x achievable?

It is arithmetically reachable with the shortest eyepiece and the Barlow. The optical ceiling for a 114 mm is conventionally put near twice the aperture in millimetres, and the air is usually the lower limit anyway.

Is the EQ-1 enough mount?

It is the lightest of the equatorial series, and the tube here is a metre long. Expect to wait for vibration to settle after every touch, which is the practical meaning of an undersized mount.