Skip to content

Explore Scientific - Generation II - 12-inch Truss Tube Dobsonian Telescope - ES-DOB1245-01

SKU ES-DOB1245-01
BARCODE 812257015573
Sold out
Original price $ 1,999.99 - Original price $ 1,999.99
Original price
$ 1,999.99
$ 1,999.99 - $ 1,999.99
Current price $ 1,999.99

All pricing in USD


This is a Generation II telescope. All updates have been performed on this telescope. No telescope type has changed the hobby quite as much as the Dobsonian. Before the introduction of the Dobsonian by John Dobson, the vast majority of amateur telescopes consisted of small telescopes with primitive mechanics - barely enough to see the polar caps of Mars or the rings of Saturn. Larger telescopes, such as the Schmidt-Cassegrain were reserved for the wealthy. The ingenious combination of simple yet effective mechanisms with the greatest possible opening gives the Dobsonian telescope a unique triumphant march around the world. Nowhere do you get as much light for your money like a good Dobson. Disassembly of the scope without tools ensures a trouble-free transport of this great scope even in small cars. The entire structure has been optimized for maximum stiffness with minimal weight. The combination of high altitude bearings with optimized aluminum structures allows fine adjustment flows at high magnifications.

The ideal workhorse for the deep sky observers. A 305mm mirror collects more than 1,800 times as much light as the naked eye. Details on planets and deep sky objects will be visible even for inexperienced observers. Bright star clusters are resolved to the core, and the sight of the terminator on the moon is an unforgettable experience.

Includes 2" focuser with helical gearing and 10:1 reduction; LED Red Dot Finder, collimation assist tool; soft light baffle and two radial main mirror fan for fast temperature equilibrium. AA Battery Pack for fans not included.

The scope is ready for the use with our optional coma corrector.



Item Number DOB1245–01
f/ratio f/5
Focal length 1,525 mm
Primary mirror diameter 35 cm
Secondary obstruction 24%
Mirror cell support points 9
Truss pole length 88 cm
Truss pole diameter 20 mm
Secondary cage assembly diameter 38 cm OD
Secondary cage assembly weight 6.5 pounds
Secondary cage assembly height 17 cm
Mirror box/rocker box height 42.5 cm
Mirror box weight * 50 pounds
Height to center of eyepiece at zenith 142.24 cm
Theoretical limiting stellar magnitude 0.38 arc sec
Theoretical Rayleigh limit 0.45 arc sec
Theoretical limiting magnitude 15.11 mag
Theoretical maximum magnification 600x
* Mirror weight can vary because of the manufacturing process; these values are approximate


Limited Warranty is one year, which converts to the Explore STAR Transferrable Product Warranty when product is registered within 60 days of purchase. Click Here to register.


To download printable PDF manual Click Here

Recommended Accessories: 12V Battery Power Supply for Dobsonians

CA Residents: Prop 65 WARNING(S)