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Omegon Ritchey-Chretien Pro RC 406/3250 Truss OTA

Omegon RC carbon-fibre truss-tube telescope - professional astrophotography for your observatory

If astrophotography is your passion and you are looking for exactly the right telescope for your observatory, then a Richey-Chretien telescopes is ideal. Their large mirror optics produce a nearly perfect image. The two hyperbolic mirrors provide a large, well-illuminated and coma-free image from the compact design. The result - perfect stellar images right out to the edge of the field of view. That is also the reason why countless professional observatories and institutes swear by this system.

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Product description:

Omegon f/4 astrograph - for unforgettable astronomy photos

Which other type of telescope can be used to create a beautiful image with so little effort? With Omegon astrographs this is easier than with 'ordinary' telescopes. Why? The answer is obvious - because an aperture ratio of f/4 means a big light output and consequently shorter exposure times. Immerse yourself in the world of deep sky photography. Admire faint galaxies or details in hydrogen nebulae. The Omegon astrograph sets a new benchmark for your astronomy photos.

The advantages in a nutshell

f/4 astrograph - a telescope with ultra-fast aperture ratio for short exposures

suitable to go on medium mountings due to its short overall length

wide field of view for extended objects - approx. 24mm is illuminated

94% reflection parabolic main mirror for bright images

large secondary mirror - good illumination for DSLR cameras

robust 2" Crayford focuser with 1:10 reduction and 1.25" reducer

faster cool-down for getting started observing quicker - main mirror fan

94% reflection f/4 main mirror

Astrographs are suitable for visual observing, but only show their full potential when used for astrophotography. Their f/4 aperture means they are among the 'fastest' Newtonian telescopes around, allowing you to take shorter exposure images.

The secondary mirror and the parabolic BK7 main mirror are 94% reflective, providing brighter and higher contrast images. One can see a visible improvement when compared to a 'normal' mirror which is around 88% reflective.

No shadows, only light - large secondary mirror

Attach your DSLR camera or a modern CCD camera to the telescope and enjoy impressive illumination over a wide field of view. No shadowing is noticeable thanks to the particularly large secondary mirror (see also below). Observing with 2" wide-field eyepieces is now perfect.

Less mistakes - more fun with the photography

The particularly short OTA length and focal length means the telescope is compact - the astrograph is about 20% shorter as compared to an f/5 system. This means you can also use this OTA's excellent optics on a medium mount, saving yourself the expense and clumsiness of a heavier mount.

Another advantage is that the astrograph is perfect for extended deep sky objects thanks to its shorter focal length. This system is also more tolerant of small tracking errors than a telescope with a longer focal length. You will achieve some astounding astrophotography with even just a little effort.

2" Crayford focuser with 1:10 fine focusing

The Omegon V-Power focuser provides precision focusing for all astronomical objects. The 1:10 reduction, sturdy ball-bearings and guide rail make the focuser stable and easy-to-use. Its optimized design means the focuser can safely carry cameras weighing up to 5 kilograms without any slipping.

extremely precise operation - the ball bearings and stainless steel guide rail mean the focuser tube runs smoothly and precisely

can carry heavy cameras and eyepieces - no slipping with up to 5kg loads

1:10 reduction means precise focusing, includes a focus scale

anti-reflection baffles for high contrast

2" to 1.25" reducer

Included in delivery and other important data

6" astrograph OTA with 63mm secondary mirror

secondary mirror marking for optical alignment

tube clamps and 22cm Vixen-style prism rail

2", 35mm extension tube

OTA length 580mm, OTA outer diameter 176mm



Type  Reflector
Type of build  Ritchey-Chretien
Aperture (mm)  406
Focal length (mm)  3250
Aperture ratio (f/)  8
Resolving capacity  0,28
Limit value (mag)  15,5
Light gathering capacity  3364
Max. useful magnification  800
Tube weight (kg)  38
Tube length (mm)  1120
Tube material  Carbon 
tube diameter (mm) 535
Tube construction Truss Tube 


Main mirror´s construction  hyperbolic
Secondary mirror material Quartz
Secondary mirror obstruction  47
Primary mirror - Material Quartz
Secondary mirror diameter (mm) 190
reflectivity 94


Type of build  Monorail
Connection ( to eyepiece)  3
Gear reduction 1:10 Fine movement


Mounting type  no mount
Type of build  OTA 
GoTo control  no

Included accessories

Prism rail Losmandy-Style
Extension tubes yes


Series Pro RC 

Area of application

Moon & Planets no
Nebulae & galaxies yes
Nature Observation no
Astrophotography yes
Sun  not recommended (Only with appropriate Sun filter)

Recommended for

Beginners  no
Advanced  yes
Observatories  yes
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