ThaiExcite

ThaiExcite
88/41 Kanlapapruek Road, Bangkae, Bangkae, 10160, Bangkok, ประเทศไทย
ติดต่อสอบถาม: 081-239-3299
อีเมล์: info@thaiexcite.com


URL: http://www.thaiexcite.com/GSO-12-Classic-Dobsonian-Telescope-with-2-Crayford-Focuser-.html


กล้องดูดาวสะท้อน GSO 12" Classic Dobsonian Telescope พร้อม Crayford Focuser 2"


รายละเอียด


คะแนนสินค้า
ผู้ผลิต
จำนวนในสต๊อก
เหลือ 1 ชิ้น
น้ำหนัก
45,000.00 g
ราคาของเรา
฿32,990.00


รายละเอียด


กล้องดูดาวสะท้อน GSO 12" Classic Dobsonian Telescope พร้อม Crayford Focuser 2"

หมายเหตุ: GSO รุ่น Classic Dobsonian ถือเป็นรุ่นแนะนำสำหรับมือใหม่ที่งบจำกัด: การออกแบบของกล้อง GSO จะมีสไตร์เรียบๆ แบบ no-frills (ออกแบบเรียบง่าย เน้นใช้งาน) ส่วนวัสดุ งานประกอบ และการควบคุมคุณภาพอยู่ในเกณฑ์ดีมาก คุณภาพของภาพที่ได้ไม่แพ้ Big 3 ในอเมริกาด้วยราคาที่คุ้มค่ากว่า แต่ถ้าสามารถเพิ่มงบอีกสักหน่อย ขอแนะนำรุ่น Pro ขนาด 12" จะเพิ่ม feature ต่างๆอีกหลายอย่างและรองรับอนาคตและอุปกรณ์ต่อพ่วง เช่นกล้องถ่ายรูปได้ละเอียดแข็งแรงกว่า (focuser แบบ 2" ที่ปรับละเอียดได้, พร้อมระบบ tube balancing, ระบบกันฝุ่นเข้า เป็นต้น) สามารถดูตารางเปรียบเทียบได้ที่ด้านล่าง

 

BBC Sky at Night magazine rating

BBC Sky at night 4.5 rating 4.5 out of 5 stars!  (review is for the 10" model)

BBC Sky at night

"..we were impressed with the crisp stars and delightful variations of colour. For simplicity and reliability, this scope ticks all the right boxes.."  - BBC Sky at Night magazine      

 

gso-dobson-12-zoll-1000

 

A Dobsonian telescope offers the best optical performance for your money. 90% of the value are concentrated in the optical tube assembly (mirror cell, focuser etc.). So you get much aperture for an affordable price. The GSO Classic Dobsonian reflector telescope combines powerful 300mm-diameter (12") reflecting optics with point-and-view simplicity in one surprisingly portable package.  At Thai Excite, a Dobsonian is no dead-end-street. We offer all possible optional equipment like tripods and mounts, dozens of eyepieces, and even equipment for astrophotography.

 

ขนาดกล้องดูดาว Dobsonian เทียบกับคน

 

The GSO Classic Dobsonian houses a big 300mm parabolic mirror with 125% more light grasp than a 8" mirror, for brighter, more detailed views of night sky curiosities. Due to the long focal length, the secondary mirror can be kept small making this telescope for a lunar and planetary specialist. The very high contrast leads to detail visibility near the physical limitations. Of course, deep sky observations are also pleasing. Pinpoint stars over the entire field of view make observing galaxies and nebulae an aesthetic delight. GSO guarantees 1/12 wave difraction limited optics. The streamlined Dobsonian telescope base offers unflinching stability yet easy portability. While the telescope may appear bulky, it can be separated into two main sections: the optical tube, and the Dobsonian base.

 

GSO 8x50 Finderscope with bracket on G680

 

Horizontal and vertical adjustment of the GSO Classic Dobsonian telescope is very easy. It has gliding bearings in both axes. The telescope remains stable - just point, release and observe. Vertical adjustment is aided by the "tension control" system (see picture above). Here, you can adjust for the stiffness in this axis and even lock it.

GSO 2-inch-crayford

The GSO 12" Classic Dobsonian telescope comes equipped with a smooth 2" craford focuser, unlike rack-and-pinion focusers in scopes in this price range.  A central part of the telescope is the good 2" Crayford focuser with many advantages:
- Much smoother focus motion compared with simpler focusers.
- Secure and scratch-free grip on the eyepieces through use of a brass compression ring (both 1.25" and 2")
- No image shift. This means that the object will remain precisely in position while you focus. Simpler focusers tend to be shifted a little bit out of alignment, resulting in a relative movement of the object. This somewhat annoying effect does not occur in the Crayford focuser.
- No play when you reverse the focusing direction. The focuser will reverse the direction in which it moves instantaneously when you change the direction in which you turn the focus knobs.

 

GSO eyepiece rack

 

It has a removable telescope eyepiece rack, a spring tension system to hold scope in position, two Plossl telescope eyepieces , and a nice 8x50 correct-image finder scope. With accessories like these included, you're ready for night after night of family stargazing fun right out of the box!

 

 กล้องดูดาวสะท้อน GSO GS580 8-inch Dobsonian secondary mirror spider vane

The GSO Classic Dobsonian also allows you to calibrate your mirrors to obtain the highest quality images that the telescope is capable of. Use any philips-head (cross-head) screw driver to keep both primary and secondary mirrors in alignment. Such screws makes it easy to get the best out of your GSO Classic Dobsonian telescope which has great reputation for its best-in-class mirrors.

 

Primary Mirror Cooling Fan: Until a mirror is properly cooled down it will create currents of warm air that will deteriorate the image - no matter which mirror substrate is used. Only after the mirror has cooled down this effect stops. The cooling fan reduces the cooling down time.

 

 gso-cooling-fan-540

 

Instruction Manaul can be found at: https://www.tejraj.com/pdf/GS680-C.pdf

 

SPECIFICATIONS

COMPARISON
GSO 12" Professional Dobsonian 
- vs - GSO 12" Classic Dobsonian
  GSO 12" Pro Dobsonian GSO 12"Classic Dobsonian
ACTUAL IMAGE  GSO G880 10-inch Dobsonian gso-dobson-10-zoll-200
Place of Manufacturing - TAIWAN Taiwan Taiwan
Newtonian Reflecting Telescope
12 inch Parabolic 1/12 wave
diffraction limited / BK7
94% enhanced coating
Diameter - 305mm
Focal Length - 1520mm
Focal Ratio - F/ 5
Faintest Steller Mag - 15.1
Resolving Power - 0.38 Arc - Seconds
2" Precission Crayford Style Focuser
Dual-Speed 10:1 ratio Micor Focuser  
1.25” eyepiece adapter
Premium Widefield SP 30mm (2")  
Premium Plossl 25mm (1.25")  
Premium Plossl 9mm (1.25")
8x50mm Multi-coated Achromatic Finder
Dobsonian Wooden Base
Altitude Ball Bearings  
Altitude Clutch  
Azimuth Roller Bearing  
Tube Balancing System  
Cooling fan for 'Thermal Equilibrium'
Eyepiece Tray
Total Height - -
Tube Length 1450 mm 1450 mm
Stand Height 640 mm 640 mm
Base Diameter  635 mm  635 mm
Shipping Weight Tube Net Weight 23Kg Tube Net Weight 27Kg
Gross weight 25 Kg Gross weight 29 Kg
Shipping Carton Dimension - -
- -

 

 

REVIEW 

BBC Sky at Night magazine
by Mark Parrish

BBC Sky at night 2

 

Our rating

BBC Sky at night 4.5 rating 4.5 (review is for the 10" model)

The GSO is a steel-tubed telescope with a large, sturdy base and an appealing price tag. The telescope tube does not come to pieces or collapse down like the others, so it comes in a pretty large box. Constructing the base is straightforward, especially if you have ever built flat-pack furniture.

A small Allen key is provided along with a tiny diagram, so good eyesight plus a screwdriver and 13mm spanner are all that’s required to put it together. The mirror is held in a substantial three-point cell and is well protected from damage and stray light inside the rigid tube. This meant the GSO was well collimated after its journey to us. Adjusting the secondary mirror requires a screwdriver, and although we didn’t like having to hold tools above the primary mirror, collimation was easy to achieve.

To aid mirror cooling, a battery-powered fan is thoughtfully provided.

The shiny silver tube is a little tricky to grasp and we felt that a simple handle would be a thoughtful addition. The mount turns smoothly, thanks to a large roller bearing in the base section and Teflon pads, which support the plastic altitude bearings on either side of the tube. In use, these worked beautifully, with just the right amount of friction generated by the downwards force from two springs that also keep the scope safely secured.

 

Sky at night GSO Dobsonian 10

 

The tube seemed well balanced even when we tried heavier eyepieces than the supplied 32mm wide-field model. The scope could also be re-mounted onto an equatorial mount if you have suitable tube rings.

Like many scopes of this ilk, the GSO comes with an eyepiece and accessory tray. The 2-inch Crayford focuser is very solidly built, with tension and locking screws that functioned very effectively. Brass compression rings are provided in the focuser and the 1.25-inch adaptor to protect your eyepieces. There’s a straight-through 8×50 finderscope held in a spring-loaded holder, which we found easy to adjust. The views through this kind of finderscope are the same way up as the main scope, which you may find convenient.

 

Beehive beauty

Our first view through the 32mm eyepiece was of the Beehive Cluster and we were impressed with the crisp stars and delightful variations of colour. The edge of the field beyond about 70 per cent was less sharp with some signs of coma (distortion of the star shapes), but this did not detract from what was a very enjoyable experience.

We turned towards nearby Mars, which exhibited good colour, but we needed to use shorter focal length eyepieces to magnify it to a reasonable size. This tube provided the best shielding from stray light and the contrast was good enough to pick out the spiral structure of the Whirlpool Galaxy (M51) in a fairly light polluted area.

 
Conclusion
 
Although at times we felt the azimuth bearing was a bit too easy to turn – we knocked the scope off target when changing eyepieces – for simplicity and reliability, this scope ticks all the right boxes.

 

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GSO is a leader in optical telescopes and accessories and their products have been sold for years by the "Big Three" (Meade, Celestron and Orion) under their own brand names. GSO telescopes and accessories are also sold under different names world-wide; Zhumell (USA), Apertura (USA), TPO (USA), Teleskop Service (Germany), Sky Optic (France), Antares (Canada), Astronz (New Zealand), and more than a dozen more brands too many to name. GSO is known for their high consistency in quality control, low defect rate, and their Taiwanese-based manufacturing scores closer to Japan in quality than other telescope manufacturers which mostly manfacture thier scopes in Mainland China. Give these telescopes a try - you will not be disappointed!