



GSO 6″ f/4 Imaging Newtonian Reflector Telescope – Steel OTA (White)
₹38,000.00 Original price was: ₹38,000.00.₹35,000.00Current price is: ₹35,000.00.
3 in stock
Portable, Light Weight, and Economical
The GSO 150mm (approx. 6″) f/4 imaging Newtonian offers a fast focal ratio that’s ideal for capturing wide-field images of hundreds of celestial objects. The short 600mm focal length keeps the tube length to a compact and easy-to-handle 21.75″, making it straightforward to guide during extended exposures. With a total weight of only 13lbs-7oz (9lbs-12oz with OTA and focuser only) this scope is ideal for use with compact and precision equatorial mounts such as the Celestron AVX, Skywatcher HEQ-5, or Orion Sirius. And with a price that’s far less than a small ED refractor or Ritchey-Chretien scope, this OTA offers an economical alternative for beginning and advanced imagers.
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.
Focuser and Accessories
The solid 10:1 dual-speed 2″ Crayford-style dual-speed focuser handles small to mid-sized astronomy cameras and webcams. It also has a tension knob and a locking knob to allow you to secure the cameras and accessories. It also has a tension knob to allow you to secure heavier loads. The ridged focus knobs give you a good feel and grip, even with gloved hands in cold weather, and the 10:1 fine focus knob lets you snap your image into perfect focus. The drawtube of the focuser is engineered to have minimal wear and very little flexure with most cameras. It offers 2″ of focus travel and includes a focusing scale on the top of the drawtube to make it easy to return to the correct focus position during each observing session.
This OTA comes with a 1.25″ eyepiece adapter with compression ring so you can use cameras with 1.25″ nose pieces, and it includes a 2″ extension tube with 35mm (1.38″) extension to give you flexibility in back-focus adjustment for visual use. This instrument can also be used with 1.25″ or 2″ eyepieces for visual observations of solar system or deep sky objects. It includes a big 8×50 straight-through achromatic finder with non-illuminated crosshair.
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. 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.
Please note:The tube rings included with GSO’s 6″ scopes are a bit smaller than they ideally should be. Hence, do not attempt to rotate the tube within loosened rings unless you completely open them or you will scratch the tube finish. Some customers resort to removing the felt lining and replacing it with a thinner alternative to allow the tube to rotate within the rings.
Order Processing
- Processing Time: Orders are processed within 1-2 business days. Please note that we do not process or ship orders on weekends or public holidays.
Shipping Rates & Delivery Estimates
- Standard Shipping:
- Delivery Time: 3-5 business days
- Shipping Cost: Free on orders above ₹1000
Shipment Confirmation & Tracking
- Order Confirmation: Once your order is processed and shipped, you will receive an email confirming the details of your order.
- Tracking Information: A tracking number will be provided within 24 hours of shipment, enabling you to monitor your order’s progress.
Shipping Restrictions
- We currently ship exclusively within India.
- Please note that we do not ship to P.O. boxes or APO/FPO addresses.
Delivery Delays
- Unforeseen Circumstances: Although we make every effort to deliver within the specified time frame, there may be delays due to unforeseen events such as adverse weather, courier service disruptions, or other external factors.
- Communication: In case of significant delays, we will notify you promptly and keep you updated on the status of your order.
Customs, Duties, and Taxes
SLT Retailers is not liable for any customs duties, taxes, or fees that may be applied during or after shipment. These charges are the responsibility of the customer.
Damaged, Lost, or Stolen Packages
- Damaged Goods: If you receive a damaged item, please contact us immediately with photographs of the damage. We will arrange for a replacement or refund as per your preference.
- Lost or Stolen Packages: We are not responsible for packages confirmed as delivered to the address provided. If a package is lost or stolen, we will verify the delivery details, including tracking information, and assist you with the investigation.
Return Policy
- We accept returns within 7 days from the date of delivery only if product is defective or damaged at the time of delivery.
- Please note: Returns will not be accepted for products that are damaged or broken. For accuracy, we request that you record a video while unboxing the product to verify its condition upon delivery.
- Once your return request is submitted, we will arrange a pick-up within 2-3 business days. A refund will be processed within 3-5 business days following the return.
- In certain regions, pick-up services may not be available. In such cases, you may choose to return the product via any courier service, with Speed Post being a preferred option.
Need Assistance?
For any questions regarding refunds or returns, please contact us at:
returns@sltretailers.com
Contact Information
For any inquiries regarding our shipping policy, please reach out to us:
- Email: contact@sltretailers.com
- Phone: +91-8287 2035 29
- Address: A/30, opposite, Sector 3, Vaishali, Ghaziabad, Uttar Pradesh 201010
Specifications
- Optical design: Newtonian reflector
- Aperture: 150mm (5.9″)
- Focal ratio: f/4
- Focal length: 600mm
- Primary mirror: Parabolic primary mirror; minimum 92% reflectivity; protective quartz layer
- Secondary mirror: 62.5mm minor axis; minimum 92% reflectivity; protective quartz layer
- Secondary mirror holder: 4-vane all metal spider
- Secondary obstruction size: 41.7% by diameter; 17.4% by area
- Tube outside diameter: End rings = 7.2″; tube = 7″
- Tube length = 21.75″
- Tube weight (with included accessories): 13lbs-7oz
- Shipped size / weight = 26″x16″x10.5″ / 16lbs-13oz
Included Items
- 150mm f/4 Newtonian optical tube assembly
- 2″ Crayford-style linear bearing focuser with 1.25″ eyepiece adapter
- 8x50mm straight-through finder with bracket and base
- Tube rings
- 8.7″ Vixen-style dovetail rail
- 2″ extension tube with 35mm extension
- Front dust cover
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 8×50 straight-through finder, and an 8″ Vixen/Synta-style dovetail plate.
- Fast 6″ f/4 Newtonian optics for wide-field imaging with DSLRs and a wide range of CCD and CMOS astronomy cameras
- Dual-speed 2″ Crayford linear bearing focuser securely holds small to mid-sized cameras and accessories with minimal wear and flexure
- Includes 2″ 35mm-long extension tube and 2″-1.25″ eyepiece adapter
- 8″ Vixen-style dovetail bar with dual split-hinged felt-lined mounting rings to protect tube finish
- 8×50 straight-through achromatic finder mounted on quick-release bracket
- Center dot on primary mirror for quick and easy collimation
- Solid rolled steel telescope tube with gloss white exterior finish and matte black interior finish to increase contrast and minimize thermal effects
Reviews
Clear filtersThere are no reviews yet.