Explore Scientific 20" f/3.6 Truss Tube Gen 2 Dobsonian Telescope

Explore Scientific 20" f/3.6 Truss Tube Gen 2 Dobsonian Telescope

Explore Scientific 20" f/3.6 Truss Tube Gen 2 Dobsonian Telescope

B&H # EXDOB203600 MFR # DOB2036-00
Explore Scientific 20" f/3.6 Truss Tube Gen 2 Dobsonian Telescope

Show MoreLess

Close

Now Viewing:

More on the Way
Expected availability: 7-14 business days

Product Highlights

  • 20" / 500mm Dobsonian Reflector
  • 1826mm Focal Length, f/3.6 Focal Ratio
  • 10:1 2.5" Two-Speed Helical Focuser
  • Floor-Based Manual Alt-Az Mount
  • Altitude Tension Clutch
  • Dual Radial Main-Mirror Fans
  • Red Dot LED Finderscope
  • Tool-Free Breakdown and Assembly
Show moreShow less

Aperture: 20" f/3.65

10" f/5.0

Special Order

12" f/5.0

Special Order

16" f/4.5 20" f/3.65

B&H $500 Gift Card Dash

Share for a chance to win a $500 B&H Gift Card!

Share on Twitter

Share a favorite product for chances to win one of eight $500 B&H Gift Cards!
1 new winner announced every Monday starting Nov 5th!
Limit 1 entry per day: Come back every day to increase your chance of winning.

Be sure to mention #BHWishList when you share!

Congrats to our winners so far:

Next winner: Dec 17th

James Z. (Wk 1)

Ralph H. (Wk 2)

Arturo M. (Wk 3)

Rich P. (Wk 4)

Valeria A. (Wk 5)

Sabrina B. (Wk 6)

Official Rules

OFFICIAL B&H $500.00 GIFT CARD DASH SWEEPSTAKE RULES

NO PURCHASE IS NECESSARY TO ENTER OR WIN. The B&H $500.00 Gift Card Dash (the "Sweepstakes") is void where prohibited by law and is sponsored by B&H Foto & Electronics Corp., 440 Ninth Avenue, New York, NY 10001 ("Sponsor"). It is not sponsored or endorsed by Facebook or Twitter in any way.

Entry Period/Methods of Entry. The Sweepstakes will run from on or about October 28, 2018 until on or about December 23, 2018 (the "Entry Period"). Entries received outside the Entry Period are void. Enter the Sweepstakes via either one of the following methods. (1) Share any product found on the B&H website (the "Website") on Facebook or Twitter via the dedicated links contained on the website using the hashtag #BHWishlist; or (2) Mail a postcard (postmarked during the Entry Period) containing your name, address, phone number, and email address, and indicate the subject(s), if any, about which you are interested in receiving future emails from B&H (e.g. photo, video, audio, computers, home theater, portable entertainment ) (optional) to: B&H $500.00 Gift Card Dash Sweepstakes, c/o B&H Foto & Electronics Corp., 440 Ninth Avenue, New York, NY 10001 (either option, an "Entry"). Entries must not, in the sole and absolute discretion of the Sponsor, contain obscene, provocative, defamatory, sexually explicit, or otherwise objectionable or inappropriate content. Entries deemed by Sponsor to be inappropriate will be disqualified. Entries owned by a third party, or the use of any trademarks, service marks, logos, brands, or products owned by a third party are not acceptable for entry into the Sweepstakes. Limit 1 entry per person, per day.

Winner Selection/Prizes/Odds. The B&H Social Team will randomly select a winner from among all eligible entries every Monday during the Entry Period, for a total eight (8) winners (each a "Winner"). Each Winner will receive a B&H Gift Card pre-valued in the amount of $500.00. No cash or other substitutions will be offered. Winner selection is in the sole and absolute discretion of the B&H Social Team. Any taxes are the sole responsibility of the winner. Winners will be notified and receive their prize at the email address associated with the account to which their Entry was posted or the email account provided with a mail-in entry. The odds of winning depend on the number of eligible entries received.

Identity of Winners/Eligible Participants. Winners will be identified by the email account associated with the Facebook or Twitter account from which their Entry was submitted or the email account provided with a mail-in entry. An email account holder shall mean the natural person assigned to such email account by the internet access or online service provider or other organization responsible for assigning email addresses for the domain associated with such email account. Any issues regarding the identity of a Winner shall be resolved by Sponsor in its sole discretion. The Sweepstakes is only open to residents of the United States that are at least eighteen (18) years of age on their entry date and is not open to employees of Sponsor, their immediate family, any person domiciled with such employees, or any affiliates or subsidiaries of Sponsor.

Entry Ownership/Entrant Agreements. Entrants retain full ownership and copyrights to their Submission. However, by entering the Sweepstakes entrants grant Sponsor permission to use their Entries for promotional purposes on their respective social media channels with proper credit. Entrants also agree: (a) to be bound by these Official B&H $500.00 Gift Card Dash Sweepstakes Rules; (b) that any claims related to this Sweepstakes shall be resolved individually without resort to any form of class action and that awards, shall be limited to actual out-of-pocket costs incurred in entering the Sweepstakes, and shall not include incidental or consequential damages or attorneys fees; and (c) that any actual or perceived ambiguities in these rules shall be interpreted by Sponsor in their sole discretion.

Limitation of Liability/Sponsor Modification/Cancellation Rights/ Choice of Law/ Venue/ Winners List. Sponsor is not responsible for incomplete entries or for failure to receive entries due to technical failures or human error of any kind. Winners agree that Sponsor will have no responsibility for losses or damage of any kind resulting from the acceptance, possession, or use of the prizes. Except where prohibited, participation in the Sweepstakes constitutes entrant's consent to the publication of his or her name by Sponsor in any media for commercial or promotional purposes without limitation or further compensation subject to Sponsor's respective Privacy Policies. Sponsor may modify or discontinue the Sweepstakes at any time and may disqualify from the Sweepstakes any person it determines, in its sole discretion, to have attempted to or actually tampered with or otherwise abused any aspect of the Sweepstakes. Entrants agree that in the unlikely event a dispute arises in connection with this Sweepstakes, it will be governed by the laws of the State of New York and heard exclusively in a court of applicable jurisdiction in the County and State of New York irrespective of any choice of law provisions to the contrary. To receive names of the winners by U.S. mail, please mail a self-addressed stamped envelope to: B&H Foto & Electronics Corp., Attn: B&H $500.00 Gift Card Dash Sweepstakes, 440 Ninth Avenue, New York, NY 10001. Any Winners List request must be received by B&H within one (1) year of the date the Sweepstakes is conducted.

Let us know how to reach you if you win!

Privacy 100% guaranteed; email address for contact purposes only

Email

Already have a B&H account? Just log in tomorrow to enter again!

$0 VA Sales Tax Collected on This Item
$8,599.99
OR
Add to Wish List Item in Wish List

Explore Scientific DOB2036-00 overview

  • 1Description

Completely redesigned, the Explore Scientific 20" f/3.6 Truss Tube Gen 2 Dobsonian Telescope gets improvements to stiffness and load bearing capacity of the optical components to safely carry the large primary mirror and move the entire system smoothly with greater vibration suppression. All connections of the tube structure are welded, with no rivets or screws.

The ability to produce the large 20" aperture gives users exceptional performance with a low dollar-to-aperture cost. Its oversized parabolic primary mirror is highly reflective and corrects spherical aberration to eliminate distortion across the entire field of view, especially at the edges. The large aperture draws in a tremendous amount of light to present awe-inspiring details of the Moon and planets, make deep sky objects visible even for inexperienced observers, and reveal bright star clusters with resolution down to their core. Its exceptional f/3.65 focal ratio and 10:1 dual-speed 2.5" helical focuser makes this an ideal choice for imaging. The fast focal ratio enables devices to capture images in less time than slower scopes with limited light loss to diffraction and diffusion, while the unique focusing mechanism employed in the helical design gives it the ability to achieve tack-sharp focusing with zero backlash, which rack-and-pinion focusers are generally unable to do. This focuser will accept larger 2" eyepieces so users can enjoy a truly immersive visual experience and will ensure larger imaging sensors are completely covered.

The rocker box provides a rock-steady observational platform with very low vibration, and features high-altitude bearings with aluminum structures that allow for fine adjustment flows at high magnifications, and an array of fans in the box and at the primary mirror allows the telescope to quickly adjust to the ambient air temperature to reduce distortion. Finally, the tension control handle allows users to adjust the settings, allowing them to move the mount easily and smoothly by hand with minimal vibration and maintaining its position when released.

Optical Tube Assembly
  • Open aluminum truss design maintains performance while reducing weight, without sacrificing strength or stiffness
  • Oversized 20" / 500mm aperture draws in the light required for viewing deep space objects, like wispy nebulae and splitting binary stars, and reveals stunning lunar and planetary details
  • Fast f/3.6 focal ratio ensures high light transmission through the optical system with limited diffraction or diffusion
  • Long 1826mm focal length produces a high magnification potential
  • Silvered aluminum mirror coatings boost reflectivity to greater than 94% to maximize image brightness
  • 120mm secondary mirror, 24% obstruction
  • Primary mirror and rocker box fans help to maintain mirror temperature to reduce distortion
  • Fans run on eight user-supplied AA batteries
  • Laser-engraved center mark on primary mirror enables easier collimation
  • Includes collimation assist tool for adjustments in the field
Mount
  • Manual alt-azimuth rocker mount design
  • Six supporting base feet improve stability to improve vibration suppression and smooth rotation
  • High altitude bearings enable a wide adjustment and travel range, with smooth movement and limited vibration
  • Tension control handle allows for smoother rotation to reduce vibrations and limit overcompensation
  • Assembles and disassembles without tools
Focuser
  • Dual-speed focusing mechanism with 10:1 reducer enables fast coarse and precision fine focusing
  • Large 2.5" helical design provides strength and stability for large and heavy eyepieces, and moves the drawtube forward and back without rotation to maintain optical performance through eyepiece or imaging system
  • Accepts large 2" eyepieces to ensure a relatively large field of view at all magnification to keep objects within the eyepiece for the maximum amount of time before adjustments to the mount are required
  • Helical focusers use a toothless design that allows for smooth and precise focusing without backlash
UPC: 811803030107
In the Box
Explore Scientific 20" f/3.6 Truss Tube Gen 2 Dobsonian Telescope
  • Collimation Assist Tool
  • Red Dot LED Finderscope
  • Limited 1-Year USA Warranty, Extendable to Transferrable Lifetime Warranty with Registration
  • Table of Contents
    • 1Description

    Explore Scientific DOB2036-00 specs

    Optical Tube Assembly
    Optical Design Dobsonian Reflector
    Aperture 508 mm / 20"
    Focal Length 1826 mm
    Focal Ratio f/3.6
    Eyepiece Barrel Diameter 2"
    Finderscope Yes
    Optical Tube Dimensions 70.5 x 27" / 179.1 x 68.6 cm
    Mount
    Type Manual; Alt-Azimuth
    General
    Batteries 8 x AA
    Weight 116.0 lb / 52.6 kg

    Explore Scientific DOB2036-00 reviews

    Be the first to review this item

    Explore Scientific DOB2036-00 Q&A

    Explore Scientific DOB2036-00 accessories

    See any errors on this page? Let us know.