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2” Super Binoviewers was completed

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#1 lanfeng

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Posted 21 July 2019 - 07:28 AM

2” Super Binoviewers

 

50mm prism with 1/10 pv

46mm Reflector with 1/10 pv

Clear aperture:46mm

Weight:1.8kg

Optical path:≈220mm

 

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#2 denis0007dl

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Posted 21 July 2019 - 07:56 AM

Very nice job waytogo.gif



#3 Shorty Barlow

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Posted 21 July 2019 - 08:22 AM

Wow! I'm impressed.



#4 Astrojensen

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Posted 21 July 2019 - 08:59 AM

Yikes! Those are BIG!

 

 

Clear skies!
Thomas, Denmark



#5 austin.grant

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Posted 21 July 2019 - 10:40 PM

"Yeah, but your scientists were so preoccupied with whether or not they could, they didn't stop to think if they should." - Dr. Ian Malcolm, Jurassic Park



#6 Eddgie

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Posted 22 July 2019 - 08:20 AM

Beautifully done!  It appears that you already have a large binocular telescope, so I can't imagine your motivation to build such an instrument, but it I cannot fault your execution.   I admire it when people talk about building something ( very common on CN), and actually build it, but I admire it even more when the piece speaks of high quality manufacturing. If you are a professional machinist, that makes understandable, but if you are just a talented amateur, that makes it all the more impressive.  I rarely see work of this quality by home builders.  Bravo!


Edited by Eddgie, 22 July 2019 - 10:07 AM.

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#7 Bob4BVM

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Posted 22 July 2019 - 07:32 PM

VERY nice !  Thanks for sharing your work with us !



#8 Simon B

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Posted 23 July 2019 - 12:06 AM

A gargantuan beast of a binoviewer... I love it bow.gif



#9 noisejammer

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Posted 13 August 2019 - 08:43 PM

Nice work!

 

With a 220mm optical path and ~47mm entrance pupil,  I get that they should offer an unvignetted centre at f/4.7. If mounted on a slow-ish scope, this sounds very usable indeed.

 

1.8kg. Add a pair of ES 17/92's (1.3 kg ea) and you'll need a crane to lift it. :D



#10 faackanders2

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Posted 07 September 2019 - 07:36 PM

Nice work!

 

With a 220mm optical path and ~47mm entrance pupil,  I get that they should offer an unvignetted centre at f/4.7. If mounted on a slow-ish scope, this sounds very usable indeed.

 

1.8kg. Add a pair of ES 17/92's (1.3 kg ea) and you'll need a crane to lift it. laugh.gif

why a slow scope?



#11 noisejammer

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Posted 08 September 2019 - 01:02 PM

why a slow scope?

Binoviewers intrinsically have a long optical path - typically they vignette all light from a cone that's outside ~ f/4.5 to f/5. Even at f/7, there's appreciable loss of light at the edge of the field.

 

In this case the optical path / entrance pupil is 220/46 = 4.8 so all light outside the  f/4.8  cone will be lost. For comparison, the Baader MkV has a path / entrance pupil of about 120/27 = 4.4


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#12 lanfeng

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Posted 28 October 2019 - 09:43 PM

Beautifully done!  It appears that you already have a large binocular telescope, so I can't imagine your motivation to build such an instrument, but it I cannot fault your execution.   I admire it when people talk about building something ( very common on CN), and actually build it, but I admire it even more when the piece speaks of high quality manufacturing. If you are a professional machinist, that makes understandable, but if you are just a talented amateur, that makes it all the more impressive.  I rarely see work of this quality by home builders.  Bravo!

for large telescopes,200APO or bigger



#13 Yodadonkie

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Posted 29 October 2019 - 12:55 AM

Whow,that’s a BINOSAURUS grin.gif

 

Nicebow.gif


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