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Blue Fireball 1.25" to 2" Eyepiece Adapter # E-05

4.8 (20 Reviews) Read Reviews Write Review
Brand Blue Fireball
Part Number E-05
Availability available

Product Info

Manufacturer Description

This popular eyepiece adapter allows 2" eyepieces, diagonals, and other accessories to be used in 1.25" focusers, diagonals and barlows. Precision machined from black anodized aluminum, this premium adapter includes a brass compression ring that restrains the eyepiece and prevents marring of the eyepiece barrel by the metal set-screw. The lower barrel is threaded to accept standard 1.25" filters.

Total height = 2.35" (59.8mm). Height of upper 2" barrel = 1.53" (38.8mm). Height of lower 1.25" barrel = 0.8" (21mm). Weight = 3.1oz.

Please note that the use of extension/conversion tubes such as this item requires additional in-focus travel. If your eyepiece is fully seated in the 2" upper barrel, then you will require 1.53" of additional in-focus travel. If your eyepiece does not fully seat in the barrel and extends out, then you will require additional in-focus travel by the amount the eyepiece extends out. As in the case of barlows, focal reducers, diagonals, and other accessories, your telescope may or may not be able to accommodate this additional travel requirement, so you may not be able to reach focus with all eyepieces and configurations. That is technically a limitation of the mechanical design of the telescope and not a shortcoming of the product itself.

Also, it is possible that your view through some 2" eyepieces might be vignetted when used with this adapter because of the smaller 1.25" barrel in the light path. This will depend on your telescope and eyepiece combination and cannot be predicted in advance. However, many customers have successfully used this adapter with many 2" eyepieces, especially in the Meade ETX line of telescopes.

Reviews

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

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      Review by Ric H.
      1549903503
      Feb 11, 2019

      5.0 Works well

      Pros:

      Cons:

      Comments:

      I got this to use a 2” barreled 18mm Explore Scientific 82 afov eyepiece with my Vixen 130 Newtonian which only has a 1.25” eyepiece barrel. It works great!

      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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      Review by sergio f.
      1546494547
      Jan 2, 2019

      5.0 Great Adapter

      Pros:

      Cons:

      Comments:

      I use this to use my 2" eyepieces with a Coronado SolarmaxII scope that has a 1 1/4" diagonal. Works well and it is well made, Of course you wont get the full 2" eyepiece experience but you will get the comfort of using your favorite eyepieces.

      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 Philippe G.
      1521356638
      Mar 18, 2018

      5.0 5/5

      Pros:

      Cons:

      Comments:

      5/5

      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 Orlando M.
      1506555125
      Sep 27, 2017

      4.0 Excellent production for the money

      Pros:

      Cons:

      Comments:

      It works as it should

      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 john o.
      1504711448
      Sep 6, 2017

      5.0 hard to find item for my telescope

      Pros:

      Cons:

      Comments:

      Yes, now I can also use my wide field 2 inch optics on my scope for more versatility.

      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 W.
      1497440073
      Jun 14, 2017

      5.0 Excellent

      Pros:

      Cons:

      Comments:

      Excellent

      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 Fred E.
      1488322866
      Feb 28, 2017

      5.0 Very handy adapter

      Pros:

      Cons:

      Comments:

      Very well made and finely finished black anodize. Securely holds your pricy 2" optics and allows their use in scopes with 1.25" ports. Works well.

      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 Just a customer of Wyoming.
      1424563200
      Feb 21, 2015

      5.0 Great way to swap out 1 1/4 ep for a 2"

      Pros:

      Lightweight,Easy to Use

      Cons:

      Comments:

      Allows you to use 2" ep's without a 2" diagonal.

      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 Chuck of Brook Park, Ohio.
      1413590400
      Oct 17, 2014

      5.0 Eyepiece Adapter

      Pros:

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

      Cons:

      Comments:

      Bought this so I could use some of my 2 inch filters on a 1-1/4" eyepiece holder.
      I screw the 2 inch filter onto a 1-1/4" to 2 inch eyepiece adapter holder and insert it in this adaper with a 1-1/4" eyepiece. You could also use 1-1/4" filters with 2 inch eyepieces with this adapter on a telescope that doesn't allow the use of 2 inch eyepieces.

      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 Wild Bill of San Diego, CA.
      1409961600
      Sep 5, 2014

      5.0 An unusual purpose...

      Pros:

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

      Cons:

      Comments:

      I obtained a couple of very large Japanese-made Barlow lenses (for photographic lenses) that are of higher-quality than many that are made for Astronomical purposes. The problem was how to use even one of them because there was no housing that would mount in the optical train of my telescopes, just the bare lens in a threaded aluminum barrel, (and I don't have a lathe to make a housing.)
      The 2 inch ID of the adaptor allowed the Barlow to fit perfectly inside, on plane and optical axis, and it was done! Spectacular views, with no edge-distortion or crunching!

      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 Duce of Tampa, FL.
      1348531200
      Sep 24, 2012

      5.0 Great product!

      Pros:

      Lightweight,Compact,Accurate,Perfect Fit,Strong Construction,Easy to Use,Quality Lenses

      Cons:

      None

      Comments:

      Great fit on all of my lenses and filters.

      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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      Review by Nakegun of Lake Elsinore, California.
      1341100800
      Jun 30, 2012

      4.0 Simple, necessary.

      Pros:

      Strong Construction,Accurate,Easy to Use,Lightweight

      Cons:

      Comments:

      Adapters are essential to utilize all the variations of products possessed by anyone who has been involved in visual astronomy for more than a decade, or so. This item does its job.

      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 Pete of Morristown, NJ.
      1341014400
      Jun 29, 2012

      5.0 Stable, well-made product

      Pros:

      Easy to Use,Compact,Strong Construction,Excellent fit to focuser

      Cons:

      Comments:

      Worked extremely well to mate a DSLR camera to ETX-90 telescope. Set up to observe the transit of Venus, no problems focusing the camera from near to infinity.

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

      This review was provided courtesy of AgenaAstro.com

    14. Guest

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      Review by Astro Bug Richard of Sunnyvale,CA.
      1320537600
      Nov 5, 2011

      5.0 Hard to find adapter finaly found

      Pros:

      Strong Construction,Easy to Use,Accurate

      Cons:

      Comments:

      I finaly found a way to use some of my two inch accessaries with a one and a quarter inch focuser. Like a two inch diagnal and some two inch eye pieces. Most adapters reduce down in size. I could not find this combination any were until I found the Blue Fireball adapter from Agena Astro Products. I think it was a great find and is made very well. Thanks for providing me with more options.

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

      This review was provided courtesy of AgenaAstro.com

    15. Guest

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      Review by futari of Barcelona Spain.
      1292803200
      Dec 19, 2010

      4.0 Accurate item and good price

      Pros:

      Accurate,Strong Construction

      Cons:

      Comments:

      Solid unit with very nice compression ring

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

      This review was provided courtesy of AgenaAstro.com

    16. gazer

      gazer New Member

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      Review by Seppo Kouva of Trollhttan, Sweden.
      1273363200
      May 8, 2010

      5.0 My eypiece adapter 1.25

      Pros:

      Cons:

      Comments:

      I'm using this item to my selfmade 2" adapter where I have my Vixen tele-extender V3631, so I can dubbel the magnifying in my 2" eyepices in 1.25" hertchel prism. And it works GREAT, thanks to this eyepice adepter. Thanks to you Agena AstroProducts! Regards Seppo Kouva

      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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      Review by Woody of Georgetown, TX.
      1246060800
      Jun 26, 2009

      5.0 Nice accessory for any 1.25" focuser

      Pros:

      Good design,Strong Construction,Nice Finish

      Cons:

      Comments:

      I originally purchased this to use in an ETX-125 focuser with 2" eyepieces but it works well in my other 1.25" focusers too. The brass compression ring is also a very nice touch.

      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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      Review by Nightly of Delaware.
      1243555200
      May 28, 2009

      5.0 Great accessory for ETX scopes

      Pros:

      Strong Construction

      Cons:

      Comments:

      This adapter has made a great scope even more enjoyable. With 2 inch EPs the ETX 125 can really shine. Solid construction and ease of use combine with a great price to this adapter an excellent value. If you have 2 inch EPs and an ETX give it a try.

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

      This review was provided courtesy of AgenaAstro.com

    19. prc1950

      prc1950 New Member

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      Review by prc1950 of Iowa.
      1243382400
      May 26, 2009

      5.0 Worked great in ETX 90

      Pros:

      Allows use of 2

      Cons:

      Non

      Comments:

      Allows use of some 2" eyepieces for the Mead ETX series and probably others, although I have no experiance other than what I have tried.

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

      This review was provided courtesy of AgenaAstro.com

    20. Guest

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      Review by Solar observer of Seattle, Washington.
      1243382400
      May 26, 2009

      3.0 Does what it's supposed to do

      Pros:

      Strong Construction

      Cons:

      Difficult to Use

      Comments:

      I use this device to bridge between a 2" H-Alpha solar filter assembly and a 1.25" telescope focuser.

      The only problem I have with this device is that the knurled screw that it uses to hold the 2" lens in place is a bit short and it is difficult to tighten and loosen it if you have big fingers, like me. If that were a little longer, I would have no complaints whatsoever.

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

      This review was provided courtesy of AgenaAstro.com

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