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Celestron 200 mm Newtonian with focal ratio f/5

Name: Celestron 200 mm Newtonian with focal ratio f/5
Brand: Celestron
SKU: CEN200OTA
Price: 497 EUR
Rating: 5 (2 reviews)

This telescope has sharp optics of reasonable speed.

200 mm aperture (8")

1000 mm focal length (focal ratio 1:5)

2" rack & pinion focuser with T2-thread and reduction to 1.25"

Manufacturer: Celestron

Product number: CEN200OTA

EUR 497,00

incl. 19 % VAT (DE)

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excl. 9.95 € shipping costs (DE)

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rating: 5.0 of 5

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Celestron 200 mm Newtonian with focal ratio f/5

This telescope has sharp optics of reasonable speed.

200 mm aperture (8")

1000 mm focal length (focal ratio 1:5)

2" rack & pinion focuser with T2-thread and reduction to 1.25"

Details..
Technical data..
In the box..
Reviews..

A universal telescope with much power and comfort

The parabolic primary of this 8" Newtonian mirror minimizes spherical aberration to produce a sharper image near the edge of the field of view. This scope is great for intermediate visual observers and beginning astroimagers looking for a large aperture with lots of light-gathering power.

As the telescope is meant for users who already have a suitable mount, there is no mount included!

The optics

An 8" mirror collects a lot of light, increasing the perception of dim celestial objects. The relatively short focal length and the 2" focuser have a positive effect when viewing large objects, as the latter can be seen completely in the large true field of view. Because of the large focal ratio, "hard" nebula filters can be applied when using eyepieces of long focal lenght, resulting in a clearly enhanced contrast.

On the other hand, the parabolic primary mirror allows high magnifications - helpful for moon, planets, planetary nebulae ans smaller galaxies. The low obstruction of only 26% gives more contrast, thus having advantages when observing planets.

Of course, the fast optics has also advantages in photography, is it reduces the exposure times. The coma, typical for Newtonians, can be eliminated by a coma corrector, achieving high sharpness even in the corners of the image.

General Features

8" (200 mm) f/5 optical design with 2" focuser gives excellent wide field views

Parabolic primary mirror minimizes spherical aberration to produce a better image

Low obstruction gives high contrast

Astrophotographic results obtained with this telescope on Astrobin

Here you can find some astrophotographs made with this telescope model: Link to Astrobin

Optical Design:	Newtonian reflector with parabolic primary mirror
Aperture:	200 mm (7.87 in)
Focal Length:	1000 mm (39 in)
Focal Ratio:	f/5
Focuser:	2" Rack & Pinion with reduction to 1.25" and T2-thread
Light Gathering Power:	816x
Limiting Stellar Magnitude:	14
Resolution (Rayleigh):	0.7 arcsec
Resolution (Dawes):	0.58 arcsec
Secondary Mirror Obstruction:	(56 mm)
Secondary Mirror Obstruction By Diameter:	28%
Optical Coatings:	Aluminum with SiO2 overcoat
Highest Useful Magnification:	472x
Lowest Useful Magnification:	29x
Eyepiece included:	20 mm (0.79 in)
Magnification with included eyepiece:	50x
Finderscope:	9x50 mm
Optical Tube:	Aluminum
Optical Tube Length:	37 in (940 mm)
Optical Tube Weight:	20 lbs (9 kg)