Discovery 17.5" f/4.1 Premium DHQ Split-Tube Dobsonian Telescope

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Discovery 17.5" f/4.1 Premium DHQ Split-Tube Dobsonian Telescope
Item # DI-1741S
  • Highest quality Dobsonian mount expertly crafted from birch plywood and professionally finished.
  • The Discovery 17.5" Split Tube Dob uses only hand-figured optics that are perfected to exacting "diffraction limited standards.
  • Enhanced aluminum coatings on both primary and secondary mirrors.
  • The Discovery 17.5" Split Tube Dob incorporates an aluminum mirror cell and enhanced aluminum coatings.
  • Ebony Star formica bearing surfaces, adjustable bearings and unique split-tube for easy storage and transportation.


Discovery Telescopes 17.5" f/4.1 Premium DHQ (PDHQ) Split-Tube Dobsonian Telescope

When you talk about a Discovery Dobsonian Telescope, you aren't just talking about any run-of-the-mill, mass produced dob... You're talking hand-figured quality and all American pride in workmanship. When you lay your hands on a Discovery, you'll discover what you've been missing.

All Discovery Split Tube Dobs include the finest hand-figured optics available today and are custom made-to-order. Discovery optics are manufactured in their own state-of-the-art facility, not sold out of the country to the lowest bidder. Every set of optics is painstakingly tested until it passes Discovery's strict standards for "diffraction limited". They incorporate the use of Fizuea, Equal-plate and Scatter-path interferometers and documentation can be provided for your telescope for an extra fee.

You won't find any shortcuts or substandard parts in a Discovery Telescope. There are no design flaws. Every Discovery Split Tube Dobsonian Telescope is fully assembled and checked for fit and finish before it ever leaves for shipment. All of their telescopes are handcrafted and masterfully built. You will never find a Discovery Telescope sold in a discount department store... Ever!

Will you pay a little more for a Discovery Dob? Yes. But you won't have to pay for extras that should be part of a standard package. All Discovery Split Tube Dobsonian Telescopes come with a 2" Crayford focuser with 1.25" adapter, dust cover and Telrad viewfinder.

Discover the Discovery difference...

Discovery Telescopes 17.5" f/4.1 Premium DHQ (PDHQ) Split-Tube Dobsonian Telescope Features...

  • 2" Crayford focuser with 1.25" adapter.
  • Telrad viewfinder and dustcover.
  • Silky smooth movements and adjusts for perfect balance.
  • Non-reflective interior surfaces.
  • High quality construction.
  • Focal ratio: f/4.1
  • Enhanced aluminum coatings.
Discovery Telescopes Product Number: 1741S
Additional Information

Additional Information

SKU DI-1741S
Manufacturer Discovery
Telescope Series Discovery PDHQ
Optical Design Newtonian Reflector
Mount Type Dobsonian Cradle
Warranty 1 Year Warranty
Telescope Aperture 17.5"
Telescope Focal Length 1820mm
Telescope Focal Ratio f/4.1
Optical Coatings Aluminum
Limiting Stellar Magnitude 15.6
Tube Color or Finish Matte Black
Finder Included Telrad
Eyepiece(s) Included 25mm Plossl
Optical Tube Weight Not supplied by manufacturer
Total Telescope Weight Not supplied by manufacturer
Length of Optical Tube Not supplied by manufacturer

Customer Reviews 1 item(s)

Great optics
The optics are great, but the hard tube is somewhat difficult to manipulate. It is a work for two persons. Each time we have to recollimate the optics obviously.
Globulars resolve great and hunting galaxies with it is easier because its aperture.
The focuser is a JMI and it moves smooth and precisely. The optional encoders and computer that I bought work fine and I think it is a must for this monster.
Photons hungry instrument!
1= Houston, We Have a Problem & 5= It's Out of This World
Review by JJ / (Posted on 10/15/2010)
Included Items

Included Items

  • 17.5" f/4.1 Premium DHQ (PDHQ) Split-Tube Dobsonian
  • 2" Crayford Focuser w/ 1.25" Adapter
  • Telrad Viewfinder
  • Dust Cover
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