Astronomy > Telescopes > Omegon > ProNewton > Omegon Teleskop ProNewton N 254/1250 OTA

Product no.: 63077

Teleskop ProNewton N 254/1250 OTA

Name: Omegon Teleskop ProNewton N 254/1250 OTA
Brand: Omegon
Price: 717.12 USD

$ 717.12 incl. VAT, plus shipping costs

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Product description Specifications Recommended accessories Customer reviews (0)

Product description

More about the series ProNewton...

Specifications

Optics

A telescope tube is referred to as an optic because it contains the components necessary to collect and concentrate light.

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Type

There are basically two different types of telescope. A distinction is made between refractor (lens) and reflector (mirror) telescopes.

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Reflector

Type of build

Describes the exact structure of the telescope thereby further subdividing the different types of telescope.

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Newton

Reflector telescope with a secondary mirror at the beginning of the tube which redirects light to one side.

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Aperture (mm)

Aperture

The aperture indicates the diameter of the objective lens or the mirror.

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254

Focal length (mm)

Focal length

This is the distance between the objective lens or mirror and the focal point.

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1250

Aperture ratio (f/)

Aperture ratio

Is the ratio of the aperture to the focal length of a telescope.

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Resolving capacity

The ability of the optic to discern the fine detail of objects that are close together.

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0,46

Limit value (mag)

Limit value

Describes the brightness of a star or point-shaped object, which can still just be distinguished by the telescope. The naked eye, for example, can make out stars with a magnitude of up to 6.

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13,8

Light gathering capacity

Light-gathering capacity of the telescope compared to the eye.

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1280

Max. useful magnification

The telescope’s magnification should not exceed this factor, because otherwise the image will appear weak and dark.

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500

Tube weight (kg)

Tube weight

The weight of the tube is critical for the correct choice of mount.

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Tube material

Most telescopes are made of steel, aluminium or carbon fibre.

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Steel

Tube length (mm)

Tube length

Including eyepiece, but excluding dew cap.

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1150

Coating

Aluminium and silicon dioxide

tube diameter (mm)

310

Tube construction

Full tube

Reflector

Special characteristics which only reflectors possess, can be found under this heading.

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Main mirror´s construction

Main mirror construction

Here, the construction type means the geometric shape of the primary mirror.

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parabolic

Secondary mirror obstruction

The shadow effect of the telescope optics due to the secondary mirror, because this lies in the optical path.

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Secondary mirror diameter (mm)

62,5

Ventilation for central mirror

Ventilation for primary mirror

Fan for a quicker alignment of the mirror temperature to the ambient temperature.

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yes

Primary mirror - Material

BK7

reflectivity

Focuser

A focuser is used to hold an eyepiece. The image can be focussed using the focus wheels on the side.

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Type of build

There are basically two different construction types: the rack and pinion focuser and the Crayford focuser.

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Crayford

A Crayford focuser is a ball bearing guided friction drive and allows a very precise adjustment of the focus.

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Connection ( to eyepiece)

Focusers are available in 1.25" or 2" formats. Many 2" focusers also have a 1.25" adapter.

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Gear reduction

1:10 fine focusing

Mount

A mount is the foundation of an astronomical telescope. It usually consists of the mount head and an appropriate tripod.

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Type of build

Describes the exact construction of the particular mount and thereby further subdivides the different types of mount.

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OTA

An OTA is an optical tube without a mount. It is short for optical tube assembly.

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Mounting type

Are mainly differentiated between equatorial and altazimuth. A special type of altazimuth mount is the Dobsonian mount.

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no mount

GoTo control

Object positioning system, available in real GoTo and also PushTo versions.

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Included accessories

Many telescopes came with simple accessories.

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Extension tubes

yes

Tube clamps

yes

Eyepiece adaptor

1,25" & 2"

Prism rail

Vixen-Style

General

Series

ProNewton

Omegon ProNewton telescope tubes stand for higher-quality workmanship, that are a cut above the rest.

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Total weight (kg)

Area of application

The area of application will give you a broad overview of the purposes for which the telescope is suited.

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Moon & Planets

yes

Nebulae & galaxies

yes

Nature Observation

Astrophotography

yes

Sun

Telescopes for safe solar observing.

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not recommended (Only with appropriate Sun filter)

Recommended for

Recommended for...

The classification of the telescopes according to their suitability for beginners, advanced or observatories is useful as an initial orientation.

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Beginners

Telescopes that are supplied as a complete system and are easy to operate.

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Advanced

Telescopes for experienced observers, but also for ambitious beginners.

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yes

Observatories

Telescopes suitable for a fixed mount, whether that is in the garden or an observatory.

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Omegon erecting lens 1,25"

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