6" f/4 Imaging Newtonian telescope - for astro photography and rich field observation with EXOS-II
This compact and affordable 150mm (approx. 6") f/4 Newtonian optical tube assembly (OTA) from GSO has fast optics for imaging extended deep-sky objects with a DSLR, webcam, or dedicated astronomy camera. Lightweight and easy to guide, this little Newtonian comes ready to go out of the box with a 2" Crayford-style focuser, dual split-hinged mounting rings, an 8x50 straight-through finder, and an 8" Vixen/Synta-style dovetail plate.
 
6" f/4 Imaging Newtonian advantages
fast and diffraction limited reflector system (f/4)
bright image by forced 94% mirror coatings
good field illumination by 63mm secondary mirror
robust mechanical system, no tilting/bending even under heavy camera load
improved Monorail focuser with 1:10 dual speed transmission - more stability compared with
Crayford designs 
ideal for travelling: tube length only 58 cm, weight only 3.7 kgs
 
Fast and Precision Optics
The precisely figured 6" f/4 primary mirror is made from BK7 optical glass for enhanced thermal stability. BK7 is far superior in thermal characteristics to soda lime float glass - the glass used in consumer products like cookware - that's used in many reflectors in this price range. The mirror is coated with enhanced aluminum to at least 92% reflectivity and coated with a protective layer of SiO2 (quartz) for durability. The primary mirror is mounted in a cell with six external push-pull collimation knobs on the back of the tube, and the center-marked primary makes collimation with a laser a snap.

With a cropped-sensor DSLR camera or an astronomy camera such as the ZWO ASI071MC-Pro with an APS-C sensor, this scope gives a field of view across the diagonal of 2.6 degrees, more than enough to frame the brightest regions of extended deep-sky objects like the Andromeda Galaxy, Orion Nebula, and the Horsehead Nebula.
 
What's in the Box
150mm f/4 Newtonian optical tube assembly
2" Crayford-style linear bearing focuser with 1.25" eyepiece adapter
6x30mm straight-through finder with bracket and base
Tube rings
8" Vixen-style dovetail rail
2" extension tube with 35mm extension
Front dust cover
No instruction manual is included at this time (coming soon)
 
The precise 2" crayford focuser with 1:10 micro transmission and Accessories
We offer this Newtonian telescope with a 2" Crayford style focuser with integrated 1:10 dual speed transmission. This focuser works very precise even with heavy accessories like astro cameras. With a bit of experience, you can achieve accuracies around 0.08 mm which is sufficient even for very high resolution sensors.
 
Tube and Mounting Rings
The tube of this imaging Newtonian is made from rolled steel for good thermal stability and it's capped with end rings of die-cut aluminum for protection and rigidity. It includes a dust cap. The scope also comes with two split-hinged die-cast aluminum mounting rings with felt lining to protect the finish of the tube. These rings make it easy to rotate the tube to bring the focuser and finder to the most comfortable viewing position. The bottoms of the rings have threaded mounting holes for a Vixen-style mounting plate (which is included) or an optional Losmandy-style plate. The tops of the two rings each have two threaded M6x25mm holes that are 7.5" apart so you can install a separate dovetail to mount other accessories such as a guide scope.

The tube has an attractive outside gloss white finish and a matte black interior finish to reduce stray reflection and increase image contrast. The tube is 7" in diameter (7.2" at the end rings), 21.75" long, and it extends beyond the focuser to act as a shield to prevent stray light from entering the tube and reducing image contrast.

TELESCOPE SPECIFICATION

TELESCOPE SPECIFICATION
Country of Manufacturing	TAIWAN
Optical Design	Newtonian reflector
Aperture / focal length:	6 inch (f/4)
Diameter Primary Mirror	150 mm
Focal Length, Focal Ratio	600 mm, f/4
Main mirror	BK-7 substrate, diffraction limited - 94% reflectivity
Focuser	2" Monorail with 1.25" reducer, brass compression rings and 1:10 dual speed transmission
Accepts Eyepiece Barrel Ø	50.8mm (2") to 31.7mm(1.25")
Eyepiece 1.25" / 2" OD	OPTIONAL
Barlow Lens	OPTIONAL
OTA weight:	4.4 kgs (incl. tube rings, focuser and 8x50 finder)
View Finder Scope	6x30 straight through viewfinder
Tube rings	Aluminium tube rings with flat base and M6 thread bores on both sides
Length of tube	580 mm
diameter of tube	176 mm
Optical Tube Net Weight	4.4 kg
Mount / Stand	EQUATORIAL (EQ5) parallactic mount and steel tripod stand
Mounting Base Net Weight	3.8 kg
Tripod Net Weight	4.5 kg

WARNING

This device focuses a lot of light.
Looking directly at the SUN through this device can result in partial or complete loss of vision.
For observing the SUN, we recommend you buy a 'Solar Safety Film' for this Telescope.

Buy 1000 OAKS Solarite Safety Film

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