Altair Astro RC250-TT 10" Truss Tube Ritchey Chretien Astrograph V2

A new 10" Truss-Tube design Ritchey Chretien telescope from Altair Astro and our Taiwanese manufacturing partner GSO - you probably saw the CAD drawing a couple of years ago on our website - now it's a reality.

- a more rigid outer skeleton using Carbon Fibre rods in a Surrier Truss configuration

- improved mirror support

The famous 10" Truss-Tube design Ritchey Chretien telescope from Altair Astro with new "version 2" split rear focuser backplate and mirror cell support structure. Please see thumbnail gallery for details.

- open design promotes air-flow around the optics for faster temperature equalisation

- fuzed quartz optics with enhanced 96% coatings and silicon dioxide (Quartz) protective overcoat *

- 3x rear 12v cooling fans which can be powered by batteries, a Kendrick Digifire Dew Controller 12v outlet, or a 12v DC power port such as found on the iOptron CEM60 mount.

- 2x Losmandy plates top and bottom

- special cross-weave shroud, allowing good airflow, whilst blocking out stray light and dust **

- 2x 25mm and 1x 50mm extension ring fitting between focuser and OTA to adjust backfocus (3x total) **

- 3" Linear Bearing Crayford focuser included as standard, able to carry a medium size CCD camera with OAG, or DSLR (for heavy cameras and filter wheels, you can upgrade to a Starlight Feathertouch 3.0" Focuser).

- Weight: 14.9kg without focuser 15.9kg with standard focuser

- Optional dew heater

- Optional focuser tilt-adjuster available

** These essential accessories are included in the price.

* An improved surface accuracy compared to dielectric coating over a large surface area due to less surface tension.

£799.00

Altair-GSO 8" F8 Metal Tubed Ritchey Chretien OTA

This is a "fully loaded" version of the tried and tested 8" F8 Metal-Tube Ritchey-Chrétien with the following features:

A 2" Dual Speed Linear Bearing Focuser included as standard. It will handle a DSLR or CCD camera, and a light weight filter wheel perfectly well, and is adequate in most imaging situations. Note this focuser has the Linear Bearing upgrade, and will outperform most Taiwanese dual speed focusers, both in rigidity and pulling power. It is perfectly adequate for a DSLR/CCD camera and light weight filter wheel.

A Losmandy format dovetail plate and Vixen format bar are included, attached to the top and bottom of the optical tube.

You can now use one or more Altair TMS Vixen or Losmandy clamps clamps upside down (depending on the top bar type), to attach the rings to the underside and adjust the ring spacing to fit your guide scope without having to buy an additional dovetail plate. A small guide scope is perfect for this.

3x Heavy Duty Extension tubes included (2x 25mm & 1x 50mm) fitting between the focuser and the telescope. CNC Machined out of solid billet aluminium, zero flex.

Low expansion Quartz Mirrors with 96% reflective enhanced aluminium coatings with a Quartz overcoat (Silicon dioxide).
8" aperture true hyperboloid Primary & Secondary Mirrors.

Multiple internal light baffles line the optical tube.

Fast efficient cool down time compared to a normal SCT due to the open-tube design.
This telescope is designed with enough backfocus to use an off axis guider, AO unit and filter wheel. Therefore, to create the most rigid imaging train possible, instead of placing extension tubes after the focuser it's best to place them between the focuser and the rear mirror cell. Therefore 1x 50mm and 2x 25mm large diameter extension rings are included for this purpose, which can be placed between the focuser and telescope (with zero flex), for adjusting your backfocus.

Dimensions: OTA length 455mm Outside diameter 230mm Tube weight is 7.5kgs. The central obstruction diameter is 95mm

Click here to see the Altair RC Collimation Adjuster Plate

Remember this product includes 3x extension tubes and 2x Losmandy plates top and bottom.

£1,099.00

Altair-GSO 8" F8 Deluxe CF Ritchey Chretien OTA

his is a "deluxe" version of the tried and tested 8" GSO / Orion / Astro Tech F8 Ritchey-Chrétien with the following features:

Low Weight - 7.8kg (Metal Tubed Version 9.8kg)
Fuzed quartz mirrors with dielectric coatings with higher reflectivity than the standard aluminium/SI02 coatings on the metal tube version.

Now ships with 2 x Losmandy plates top and bottom.

•A 2" Dual Speed Linear Bearing Focuser included as standard. It will handle a DSLR or CCD camera, and a light weight filter wheel perfectly well, and is adequate in most imaging situations. Note this focuser has the Linear Bearing upgrade, and will outperform most Taiwanese dual speed focusers, both in rigidity and pulling power. It is perfectly adequate for a DSLR/CCD camera and light weight filter wheel.

•NEW feature: The base of the scope now has a light-weight Losmandy-format plate to fit the iEQ45 or other Losmandy-format mounts directly. This is more rigid than the channel type Vixen/Synta format dovetail bar found on other models.

A light weight Vixen/Synta type dovetail bar is included along the top of the telescope for guide scope attachment using the Altair TMS Lightweight Guide Scope Rings. You can now use one or more Altair TMS Vixen clamps upside down, to attach the rings to the underside and adjust the ring spacing to fit your guide scope. A small guide scope is perfect for this.

•Low weight low expansion Carbon Fibre OTA, weight 7.5kg! (16.4lbs) not only giving more accurate tracking but freeing up your mount capacity for other accessories. The use of a carbon fibre weave composite reduces the weight of the optical tube with no loss of strength or rigidity compared to an aluminium tube.

•Low expansion Quartz Mirrors with 96% reflective Enhanced coatings with higher reflectivity than standard mirror coatings on other versions of this scope.
•Optional field flattener available, optimised for this optical design.
•8" aperture true hyperboloid Primary & Secondary Mirrors.
•Multiple internal light baffles line the optical tube.
•Fast efficient cool down time compared to a normal SCT due to the open-tube design.
•This telescope is designed with enough backfocus to use an off axis guider, AO unit and filter wheel. Therefore, to create the most rigid imaging train possible, instead of placing extension tubes after the focuser it's best to place them between the focuser and the rear mirror cell. Therefore 1x 50mm and 2x 25mm large diameter extension rings are included for this purpose, which can be placed between the focuser and telescope (with zero flex), for adjusting your backfocus.

Click here to see the Altair RC Collimation Adjuster Plate

Remember this includes 3x extension tubes and 2x Losmandy plates top and bottom.

GSO (Altair) 10" F8 Ritchey Chretien Optical Tube

The RC design is a true reflective design with no refractive optical elements. As such it provides superb light transmission.

The coma free field of this standard RC delivers wide flatfield performance on cameras up to the APS sized DSLR sensors.

Full format cameras require an optional corrector to achieve flat field performance.

The scope features a fixed primary and secondary mirror for flex free imaging. Included is a set of 3 thread on extension tubes to enable you to place your camera at the correct back focus distance for optimal performance. These thread between the scope and the 3" focuser - again for flex free performance.

The 3" Dual Speed Crayford focuser is a big jump in strength and rigidity from the 2" models and can easily accomodate DSLR and most CCD Imaging cameras.

This scope is a true Ritchey Chretien Astrograph and does not feature a full aperture corrector such as SCT and SCT design scopes.

Technical Specs:

10" F/8 RC
10" F/8 Primary mirror 250mm
Secondary mirror 105mm
Primary mirror diameter: 250mm
Secondary mirror diameter: 105mm
Effective Focal Ratio: F/8
Effective Focal Length: 2000mm
Back Focus: 300mm
Mirror Separation: 463mm
Mirrors material: Quartz - 99% reflectivity

Three focuser extension rings.

Tube assembly weight: 15kg

Focuser: 3" (improved rigidity)

Improved Linear 10:1 micro focuser with laser etched scale

2x Losmandy D-series adapter plates

Three Integral 12VDC cooling fans

12VDC battery pack

Altair GSO 10" F8 Ritchey Chretien Optical Tube with Carbon Fibre Tube

The RC design is a true reflective design with no refractive optical elements. As such it provides superb light transmission.

This version comes with a carbon Fibre tube. The use of a carbon fiber weave composite reduces the weight of the optical tube with no loss of strength or rigidity compared to an aluminum tube.

**Please Note the scope features Losmandy Compatible rails fitted Top and Bottom**

Click here to read a review on the 10" RC
This true Ritchey Chretien astrograph is completely optimised for imaging. A pure two-mirror optical system means zero colour aberration and a large aperture with high resolution compared to refractors costing many times more. Because it has a fixed focuser, the primary mirror flop and resultant image shift issues often associated with long focal length SCT telescopes with moving mirrors are avoided. There aren't any complex internal parts to move the mirrors back and forth while attempting to keep them accurately aligned so there's less to go wrong. Another benefit of a high quality external focuser, is that the mirrors don't have to move relative to each other to focus the telescope, and so because everything remains in place, the focal point doesn't change outside the tube, making it easier for you to achieve repeatable, accurate focusing time and time again.

The coma free field of this standard RC delivers wide flatfield performance on cameras up to the APS sized DSLR sensors.

Full format cameras require an optional corrector to achieve flat field performance.

Included is a set of 3 thread on extension tubes to enable you to place your camera at the correct back focus distance for optimal performance. These thread between the scope and the 3" focuser - again for flex free performance.

The 3" LBF Dual Speed Crayford focuser is a big jump in strength and rigidity from the 2" models and can easily accomodate DSLR and most CCD Imaging cameras.

This scope is a true Ritchey Chretien Astrograph and does not feature a full aperture corrector such as SCT and SCT design scopes.

Click here to see the Altair Focuser Collimation Adjustment Plate

Remember this product includes 3x extension tubes and 2x Losmandy plates top and bottom costing about £250-300 if bought separately.

Technical Specs:

10" F/8 RC
10" F/8 Primary mirror 250mm
Secondary mirror 105mm
Primary mirror diameter: 250mm
Secondary mirror diameter: 105mm
Effective Focal Ratio: F/8
Effective Focal Length: 2000mm
Back Focus: 300mm
Mirror Separation: 463mm
Mirror: Quartz with 96" Enhanced Coating

Skywatcher Quattro F4 Imaging Newtonian

The Skywatcher Quattro series are premium quality imaging Newtonians with a wide field of illumination and fast f4 focal-ratios.

8-inch and 10-inch models are available with steel or carbon fibre tubes. Tube interiors have knife-edge ray traced baffles.
CARBON FIBRE TUBE: Carbon fibre is a strong and lightweight material with better thermal stability than steel. This is especially important for astro-photographers dealing with long exposure times. Imaging telescopes made of less thermally stable material can deviate from optimum focus after long time exposures. With a carbon fibre tube, it can remain in focus for a longer period of time.

2" DUAL-SPEED LINEAR POWER FOCUSER: The new linear power focuser utilises four precision ball-bearings to support the drawtube for excellent stability and zero image shift while supporting a heavy imaging camera and accessories. Moving the drawtube using a roller rather than a rack and pinion ensures an exceptionally smooth and precise focus adjustment. The dual-speed feature has a second focus knob with a 10:1 speed reduction for super-fine adjustments.

PYREX MIRRORS: All models feature paraboloidal primary mirrors made of low thermal expansion Pyrex glass resulting in shorter cool-down times.

NB: Like all fast Newtonians the Skywatcher Quattro series are best suited to experienced astronomers. They require precise collimation and a Coma Corrector to reach their full potential.

Technical Specs:

Quattro 200 (8-inch) specification

Diameter of Primary Mirror 205mm
Telescope Focal Length 800mm (f/4)
Note: Eyepieces NOT supplied
9x50 Finderscope
Parabolic Primary Mirror (Pyrex)
2" (50.8mm) Dual-Speed 10:1 Linear Power Focuser
Tube Rings & Dovetail Bar
0.5mm Ultra-Thin Secondary Mirror Supports
77% more Light-Gathering than 150mm

Quattro 250 (10-inch) specification

Diameter of Primary Mirror 254mm
Telescope Focal Length 1000mm (f/4)
Note: Eyepieces NOT supplied
9x50 Finderscope
Parabolic Primary Mirror (Pyrex)
2" (50.8mm) Dual-Speed 10:1 Linear Power Focuser
Tube Rings and Dovetail Bar
0.5mm Ultra-Thin Secondary Mirror Supports
56% more Light-Gathering than 200mm