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Blue Fireball 1.25" Spacer Ring with 0.5" Extension # S-1B

5.0 (20 Reviews) Read Reviews Write Review
Brand Blue Fireball
Part Number S-1B
Availability available

Product Info

Manufacturer Description

New version with longer threads

Description/Uses:

  • 1.25" extension ring/barrel spacer
  • Provides 0.5" (12.7mm) of spacing
  • Allows you to securely set or vary the spacing between 1.25" components
  • Useful for making eyepieces parfocal or to change the reduction factor of focal reducers
  • Has standard 1.25" filter threads (male on one side and female on the other)

Features:

  • Precision machined from aluminum and black anodized
  • Threaded to accept standard 1.25" astronomy filters

Specifications:

  • Total Length = 0.62" (15.7mm)
  • Extension Provided = 0.5" (12.7mm)
  • Length of External Male Thread = 0.12" (3mm)
  • Thread Specification (External Thread) = M28.5x0.6 Male
  • Length of Internal Female Thread = 0.39" (10mm)
  • Thread Specification (Internal Thread) = M28.5x0.6 Female
  • Maximum Outer Diameter = 1.25" (31.7mm)
  • Weight = 0.2oz (6g)

Reviews

5.0 (Based on 20 Reviews) 100% of reviewers recommended this product.
Rating Distribution
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    1. Guest

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      User Notes:
      Review by Bruce H.
      1543027811
      Nov 23, 2018

      5.0 Spacer ring

      Pros:

      Cons:

      Comments:

      Spacer ring

      Bottom Line: Would you recommend this item? Yes
      Was this review helpful? Yes / No

      This review was provided courtesy of AgenaAstro.com

    2. Guest

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      User Notes:
      Review by David S.
      1533609023
      Aug 6, 2018

      5.0 Eyepiece barrel extender

      Pros:

      Cons:

      Comments:

      This worked perfectly to extend my eyepiece length and allow me to get it parfocal to the camera with a vixen flip mirror.

      Bottom Line: Would you recommend this item? Yes
      Was this review helpful? Yes / No

      This review was provided courtesy of AgenaAstro.com

    3. Guest

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      Review by Mark G.
      1517269404
      Jan 29, 2018

      5.0 Does what it's supposed to do

      Pros:

      Cons:

      Comments:

      It's a spacer ring. I'm using it to add backfocus to binoviewers being used with an 8-in dobsonian. Sits between the binoviewers and a 1.6x barlow, and the combo allows focus. Works as expected and comes in a variety of lengths so that I could get just enough extension to focus without encountering vignetting.

      Bottom Line: Would you recommend this item? Yes
      Was this review helpful? Yes / No

      This review was provided courtesy of AgenaAstro.com

    4. Guest

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      Review by George M.
      1511270317
      Nov 21, 2017

      5.0 works as intended

      Pros:

      Cons:

      Comments:

      works as intended

      Bottom Line: Would you recommend this item? Yes
      Was this review helpful? Yes / No

      This review was provided courtesy of AgenaAstro.com

    5. Guest

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      Review by Mihai R.
      1511170406
      Nov 20, 2017

      5.0 perfect, works great, fits like

      Pros:

      Cons:

      Comments:

      perfect, works great, fits like a glove, nice finish.

      Bottom Line: Would you recommend this item? Yes
      Was this review helpful? Yes / No

      This review was provided courtesy of AgenaAstro.com

    6. Guest

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      Review by Stephen F.
      1507382127
      Oct 7, 2017

      5.0 1.25" Extension Rings

      Pros:

      Cons:

      Comments:

      Inexpensive way to increase existing barlow magnification. Fits well.

      Bottom Line: Would you recommend this item? Yes
      Was this review helpful? Yes / No

      This review was provided courtesy of AgenaAstro.com

    7. Guest

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      Review by Daniel N.
      1503347624
      Aug 21, 2017

      5.0 Simple product, worked perfectly

      Pros:

      Cons:

      Comments:

      This is a fine product at a great price. Worked perfectly with my imaging setup to get more FOV with a focal reducer.

      Bottom Line: Would you recommend this item? Yes
      Was this review helpful? Yes / No

      This review was provided courtesy of AgenaAstro.com

    8. Guest

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      Review by Randy R.
      1493553046
      Apr 30, 2017

      5.0 Great product!

      Pros:

      Cons:

      Comments:

      When I need any type of machined adapter, I check Blue Fireball at Agena first! Excellent fit and finish!

      Bottom Line: Would you recommend this item? Yes
      Was this review helpful? Yes / No

      This review was provided courtesy of AgenaAstro.com

    9. Guest

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      Review by Adam C.
      1489860141
      Mar 18, 2017

      5.0 Blue fireball spacer

      Pros:

      Cons:

      Comments:

      Does what it's supposed to do. Solid, no hassle.

      Bottom Line: Would you recommend this item? Yes
      Was this review helpful? Yes / No

      This review was provided courtesy of AgenaAstro.com

    10. Guest

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      Review by Hilbily of VA.
      1424476800
      Feb 20, 2015

      5.0 Works Great!

      Pros:

      Compact,Lightweight

      Cons:

      None

      Comments:

      Works great on my focal reducer.

      Bottom Line: Would you recommend this item? Yes
      Was this review helpful? Yes / No

      This review was provided courtesy of AgenaAstro.com

    11. Guest

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      Review by XRinger of Woburn, MA.
      1413590400
      Oct 17, 2014

      5.0 Saved my video camera

      Pros:

      Strong Construction,Easy to Use,Lightweight

      Cons:

      Comments:

      My SCB-2000 camera's 1.25" adapter nose piece was too short, because my camera has be pulled back, out of the focuser's draw tube about 0.70".
      Otherwise it will not focus. The camera fell off the telescope once, saved only by the video cable.

      Adding the Blue Fireball .75" spacer to the nose piece, insures my camera rig stays on the telescope, all night long!

      Bottom Line: Would you recommend this item? Yes
      Was this review helpful? Yes / No

      This review was provided courtesy of AgenaAstro.com

    12. Guest

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      User Notes:
      Review by Newt Reno of Northern Minnesota.
      1371772800
      Jun 20, 2013

      5.0 One ring to rule them..........

      Pros:

      Strong Construction,Compact,Accurate,Lightweight,Easy to Use

      Cons:

      Comments:

      I shop exclusively with Agena for my accesories; this 1.25 spacer ring was needed for my binoviewers and it does what I needed it to do.

      Shipping is always fast and the products are always quality!

      Bottom Line: Would you recommend this item? Yes
      Was this review helpful? Yes / No

      This review was provided courtesy of AgenaAstro.com

    13. Guest

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      Review by John of Tucson.
      1370217600
      Jun 2, 2013

      5.0 Quality workmanship

      Pros:

      Accurate,Strong Construction,Lightweight,Easy to Use

      Cons:

      Comments:

      As an extension for eyepiece.

      Bottom Line: Would you recommend this item? Yes
      Was this review helpful? Yes / No

      This review was provided courtesy of AgenaAstro.com

    14. Jesús Muñoz

      Jesús Muñoz New Member

      Skill Level
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      Review by Powerstar8 of Mexico.
      1360368000
      Feb 8, 2013

      5.0 Perfect fit and finish

      Pros:

      Easy to Use,Strong Construction,Accurate

      Cons:

      Comments:

      Perfect finish make this adapter to fit flawlessly. It just work perfect.

      Bottom Line: Would you recommend this item? Yes
      Was this review helpful? Yes / No

      This review was provided courtesy of AgenaAstro.com

    15. David Dearden

      David Dearden New Member

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      User Notes:
      Review by dvdearden, amateur astrophotographer of Mapleton, UT.
      1354320000
      Nov 30, 2012

      5.0 Inexpensive and simple

      Pros:

      Easy to Use

      Cons:

      Comments:

      I use the spacer ring to get the proper spacing between a 0.5x focal reducer and my CCD camera. This ring threads into the focal reducer and the camera nosepiece simply and as advertised.

      Bottom Line: Would you recommend this item? Yes
      Was this review helpful? Yes / No

      This review was provided courtesy of AgenaAstro.com

    16. Guest

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      Review by chris of Ile-de-france, France.
      1319932800
      Oct 29, 2011

      5.0 I would buy this product again

      Pros:

      Strong Construction

      Cons:

      Comments:

      Very useful it astrophotographie with webcam

      Bottom Line: Would you recommend this item? Yes
      Was this review helpful? Yes / No

      This review was provided courtesy of AgenaAstro.com

    17. Guest

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      User Notes:
      Review by Skygeek of Los Angeles.
      1292716800
      Dec 18, 2010

      5.0 Strong construction

      Pros:

      Strong Construction,Compact

      Cons:

      None

      Comments:

      Well made adapter, helpful for reaching focus with some astro cameras or eyepieces.

      Bottom Line: Would you recommend this item? Yes
      Was this review helpful? Yes / No

      This review was provided courtesy of AgenaAstro.com

    18. Guest

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      User Notes:
      Review by Lannding of Granite City, Illinois.
      1265932800
      Feb 11, 2010

      5.0 Item works as advertised

      Pros:

      Compact,Accurate,Quality Lenses,Strong Construction

      Cons:

      NO CONS

      Comments:

      Very useful for astro photography.

      Bottom Line: Would you recommend this item? Yes
      Was this review helpful? Yes / No

      This review was provided courtesy of AgenaAstro.com

    19. AstroGuy1

      AstroGuy1 New Member

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      User Notes:
      Review by calastro of California.
      1241827200
      May 8, 2009

      5.0 Great product...lots of uses!

      Pros:

      Does its job well,Doesn't need improvement,Inexpensive

      Cons:

      None

      Comments:

      For what it was intended, this 1" spacer simply does its job and does it well. When used with the GSO 0.5x focal reducer in combination with an eyepiece or with a camera (webcam, video, etc.), it further deceases the effective focal ratio of the optical system.

      However, there are some other potential uses for this little accessory. I use mine attached to a LCL-902K CCD video camera with a 1/2" Sony CCD chip. The extension tube alone can be used with the camera to provide a convenient "nosepiece" for the camera to attach to a 1 1/4" focuser.

      It can also be used with the focal reducer at the front or the back of the Extension Tube. In other words, I can attach the focal reducer to the camera, and then use the tube as a "nosepiece". However, I can also attach the Extension Tube directly to the camera to function as both an extension tube and a nose piece and attach the focal reducer to the front of the combination.

      If you are modifying a webcam for astro use, it can perform the same functions as both an extension tube with the focal reducer or as a nosepiece for the camera.

      What else can be said? It does what it was designed to do. It is inexpensive and lends itself to a number of combinations for astro imaging. I really can't see where it could be improved upon!

      Bottom Line: Would you recommend this item? Yes
      Was this review helpful? Yes / No

      This review was provided courtesy of AgenaAstro.com

    20. calastro

      calastro New Member

      Skill Level
      Unknown
      Time with Product
      Unknown
      User Notes:
      1209499560
      Apr 29, 2008

      5.0 Great product...lots of uses!

      Pros:

      Inexpensive! Does its job well! Doesn't need improvement!

      Cons:

      None

      Comments:

      For what it was intended, this 25mm spacer simply does its job and does it well. When used with the GSO 0.5x focal reducer in combination with an eyepiece or with a camera (webcam, video, etc.), it further deceases the effective focal ratio of the optical system.

      However, there are some other potential uses for this little accessory. I use mine attached to a LCL-902K CCD video camera with a 1/2" Sony CCD chip. The extension tube alone can be used with the camera to provide a convenient "nosepiece" for the camera to attach to a 1 1/4" focuser.

      It can also be used with the focal reducer at the front or the back of the Extension Tube. In other words, I can attach the focal reducer to the camera, and then use the tube as a "nosepiece". However, I can also attach the Extension Tube directly to the camera to function as both an extension tube and a nose piece and attach the focal reducer to the front of the combination.

      If you are modifying a webcam for astro use, it can perform the same functions as both an extension tube with the focal reducer or as a nosepiece for the camera.

      What else can be said? It does what it was designed to do. It is inexpensive and lends itself to a number of combinations for astro imaging. I really can't see where it could be improved upon!

      Bottom Line: Would you recommend this item? Yes
      Was this review helpful? Yes / No
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