Telescopes > ASA > Ritchey-Chretien > ASA Ritchey-Chretien RC 500/4000 OTA

Product no.: 55246

Ritchey-Chretien RC 500/4000 OTA

$ 53,000.00 incl. VAT, plus shipping costs

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Product description

Similar picture: Delivery without camera

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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Ritchey-Chretien

Aperture (mm)

Aperture

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

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500

Focal length (mm)

Focal length

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

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4000

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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0,23

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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15,3

Light gathering capacity

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

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5100

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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1000

Tube construction

Truss Tube

Truss tube

In contrast to the solid tube, here the optical tube is constructed of rods.

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Tube material

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

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Carbon

Carbon is especially light and stable, but is also more expensive than metal

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Tube weight (kg)

Tube weight

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

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Coating

Aluminium and silicon dioxide

Reflector

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

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Primary mirror - Diameter (mm)

510

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

AstroSitall

Secondary mirror diameter (mm)

186

Secondary mirror material

AstroSitall

Adjustable

yes

finish quality

L/8 (>95 Strehl)

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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Backfocus (mm)

Backfocus

The position of the focus, measured from the plug connection, with the eyepiece fully retracted.

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365

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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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

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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General

Series

Ritchey-Chretien

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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Astrophotography

yes (very good)

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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Observatories

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

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yes

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Downloads

Data sheet (DE)

Data sheet (EN)

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