This telescope is checked and adjusted by us before delivery. The focuser is set.

How we adjust: About us




 

GSO 200mm f / 4 Newton - 2 "Crayford Micro - Optical Tube

Aperture / focal aperture 200mm / focal length 800mm / f - 1: 4
Mirrormirrors diameter 63 mm / 70mm - small axis
Illuminated field of view Depending on the size of the secondary mirror
Net weight of the tube 8.7 kg (with clamps, pull-out and 8x50 viewfinder)
Diameter / length diameter - 230 mm / length 730 mm
Main mirror mirror carrier BK-7 - image much better than diffraction-limited - 94% mirroring
Focuser 2 "Crayford with reduction 1,25" - Clamping via ring clamping - Micro reduction 1:10

There are not only alternators in the car! :-)
Newton telescopes are considered (and are) basically high-powered telescopes. From f / 5 I define again as particularly bright. When observing the moon, we definitely recommend a filter to reduce the glare effect. - The moon reflects so much light that the light should be attenuated (especially at low magnification). Also note the dark adaptation of the eye. For example, if I want to observe deep sky objects after the moon, the adaptation of the eye takes a certain amount of time before I can perceive the much fainter ones again in detail.
And that brings us to the objects that such a Newton can show in abundance - visually and photographically!
Deep sky objects (ie galaxies, nebulae, star clusters ...) do not need a high magnification, but a corresponding light gathering power. For photography, this also means the shortest possible exposure time for a shot.
Planets (and moon) require a higher magnification and thus a Barlow lens ???? for focal length extension.
So with this device also beautiful details on the moon and planets can be seen! So you do not have to do without this field of application:
An (almost) all-rounder among the telescopes focusing on deep sky.


Information - for astrophotographers:

• Tubus diameter ... 230mm
• Minimum height of the focuser (without reduction to 1.25 ") ... 72mm
• Distance of the focal plane above the outer wall of the tube ... 131mm
• Distance of the focal plane from the 2 "socket of the extract ... 59mm
• 100% illumination when using the capture mirror with 70mm ... approx. 12.9mm
• Opening at the front of the tube ... 222mm

(information can vary slightly between the individual devices)


Delivery:

• Optical tube with 2 "Crayford focuser (1:10 micro reduction)
• Reduction from 2 "to 1.25" with ring clamp
• Clamps made of aluminum - hinged (at the base in each case an M-6 internal thread)
• 8x50 viewfinder with multi-coated achromatic lens
• Main mirror ventilation with battery box (no batteries included)