The World's Largest Amateur Telescope

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The World's Largest Amateur Telescope
Posted by DaveMitsky on Saturday, October 19, 2013 1:54 PM

Mike Clements has completed his epic construction of a 70" telescope.

http://m.ksl.com/index/story/sid/27301024?mobile_direct=y 

Dave Mitsky

Sic itur ad astra!

Chance favors the prepared mind.

A man is a small thing, and the night is very large and full of wonders.

  • Member since
    March, 2009
Posted by pastorg on Saturday, October 19, 2013 3:37 PM

That is one awesome do it yourself project!  Hope he will share some views thru it.

Zhumell Z12 Dob, Celestron Omni XLT 102mm refractor on CG-4 Mount,  Meade AZ70 refractor, Celestron Ultima 2X Barlow 1.25, Telrad with 4 3/8 Riser, Zhumell Skyglow Filter, Zhumell OIII Filter, Baader UHC-S Filter, Meade ND96 Moon Filter, Baader Planetarium Hyperion 21mm, 13mm, 8mm and 5mm eyepieces, Meade 9mm and 25mm Plossls, Zhumell 9mm Plossl and 2 inch 30mm SWA,  6mm Orion Expanse and Pentax 10 x 50 PCF WP ll Binos

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Posted by DaveMitsky on Sunday, October 20, 2013 12:35 AM

The telescope employs a tertiary relay mirror to allow a reasonable eyepiece height. The secondary mirror has a diameter of 29 inches!

The owner plans to transport his 900-pound monster to various star parties whenever possible.

Sic itur ad astra!

Chance favors the prepared mind.

A man is a small thing, and the night is very large and full of wonders.

  • Member since
    November, 2009
Posted by Poppa Chris on Sunday, October 20, 2013 7:40 AM

Surprise  Wow!  A near terminal case of aperture fever! 

---Poppa Chris---

Denham Springs, Louisiana USA

"Second star to the right - Then straight on until morning!" - Peter Pan

Celestron CPC1100GPS (XLT) - 279mm aperature, 2800mm Focal length. (f10) Celestron Ultima LX (70deg AFOV) Eyepieces 32mm thru 5mm, Canon EOS Rebel T2i DSLR, Backyard EOS imaging software, Orion Star Shoot Planetary Imager IV, Celestron Skymaster 15x70 binoculars

 

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Posted by DaveMitsky on Tuesday, October 22, 2013 12:26 AM

Apparently, the 70" has a focal ratio of f/6.1, which means that "low" power, at an overly large exit pupil of 9mm, is 197x.  The maximum TFOV with a 55mm 2" eyepiece is only 15 arc mInutes.  A 20mm ocular produces 542x!

Dave Mitsky

Sic itur ad astra!

Chance favors the prepared mind.

A man is a small thing, and the night is very large and full of wonders.

  • Member since
    October, 2005
Posted by leo731 on Tuesday, October 22, 2013 2:31 PM

Amazing thing to do but especially the idea that he made this giant portable!  Something this large would most likely be housed in a permanent observatory not trucked around the countryside.

Truly amazing,

L

A nebula in the eyepiece is worth two in the Atlas.

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Posted by DaveMitsky on Wednesday, October 30, 2013 2:08 AM

There's another article on the 70" posted at http://www.sltrib.com/sltrib/news/57034821-78/telescope-clements-mirror-inch.html.csp

Dave Mitsky

Sic itur ad astra!

Chance favors the prepared mind.

A man is a small thing, and the night is very large and full of wonders.

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