This popular eyepiece adapter allows 1.25" eyepieces and accessories to be used in 2" focusers, diagonals and barlows. Instead of a conventional locking thumbscrew that can push the eyepiece to one side, this innovative adapter uses a helical compression mechanism to not only grip the inserted eyepiece securely, but also center the eyepiece accurately within the adapter in the process. This mechanism is easily tightened or loosened by turning the large knurled twist lock ring at the top of the adapter.
The helical centering mechanism is controlled by an inner polypropylene compression ring (or collet) that will not mar your eyepieces. Its long length ensures that the adapter works well with smooth and recessed eyepiece barrels.
This practical and superb quality adapter is made from precision machined aluminum and is black anodized. The inside surface of this tube is black-matted to enhance contrast by reducing stray light reflections. It is also threaded to accept standard 2" telescope filters so you can use your 1.25" eyepieces with your 2" filters (be careful not to let the eyepiece barrel hit the filter though; To alleviate this problem, you can attach a 2" spacer ring (not included) to the Twist-Lock adapter to increase its overall length).
And that's not all. Unscrewing the twist lock ring completely exposes a male T-thread on the lower black barrel, which conveniently functions as a 2" prime focus (2"-to-T Thread) adapter by itself. So you're actually getting two adapters for the price of one! You'll want one for every scope!
Specifications (Complete adapter):
- Total height = 1.20" (30.6mm)
- Weight = 2.8oz (79g)
- Compression band length = Approx. 16.5mm (0.65")
- Maximum diameter = 2.2" (55.8mm)
Specifications (2" prime focuser part only):
- Total height = 1.03" (26.1mm)
- Optical length = 0.08" (2.15mm)
- Clear aperture = 1.25" (31.7mm)
- Weight = 2oz (57g)
Manufacturer part number: E-11
Jul 2, 2019
Good for the pricePros: Cons: Comments:
It works for all my eyepieces, including the not-straight barrel of my ES 82°. It does a good job, especially for the price. No problem with adding a filter, but I have to take care the longer barrels don't hit it!
It would be nice to have a better grip.
This review was provided courtesy of AgenaAstro.comMay 31, 2019
A Must Have AccessoryPros: Cons: Comments:
I've had my telescope for about 1.5 years. I've always ended up getting frustrated switching eyepieces because of things like it binding up because I wasn't going 100% straight in or a set screw was in 0.000001" too much. I knew there had to be a better way. Enter the Blue Fireball 2" to 1.25" Twist Lock Self Centering Eyepiece Adapter. A few quick turns and the eyepiece slips out with ease. A few quick turns and the eyepiece is securely locked into place. One of the best features is that you can open it extra wide so no more binding as you try to find that perfect angle. This should be on everyone's scope.
This review was provided courtesy of AgenaAstro.com
Buddy NY New Member
- Skill Level
- Time with Product
May 16, 2019
- User Notes:
- Review by Buddy
Great valuePros: Cons: Comments:
I own the Baader reducer, I love it
The Blue Fireball is its equal.
It has some pros. Lighter, easy twist action..locks tight ..easy to loosen..made well.
The only down side I can imagine is in winter wearing gloves. Might be hard to grip as it has a high polish finish.
The Baader has the stem which might give better leverage with heavy gloves. But all that is trivial compared to the price difference
This is a well made reducer and preformed as good as any others I've tried.. Good to go!!
This review was provided courtesy of AgenaAstro.comDec 21, 2018
Awesome ReducerPros: Cons: Comments:
This is the second Fireball eyepiece reducer I've purchased from Agena Astro. It works well and the price point makes it a very good value.
I have the more expensive BP reducer as well, but I find the Fireball easier to use.
This review was provided courtesy of AgenaAstro.comAug 6, 2018
A great productPros: Cons: Comments:
A well manufacture piece of equipment.
Easy to use and holds the eyepiece securely.
Best of all very fast shipping with Agena Astroproducts, a
real pleasure doing business with them.
Once again well made and easy to use.
This review was provided courtesy of AgenaAstro.comJul 31, 2018
Blue Fireball/Twist lock self centering eyepiecePros: Cons: Comments:
Both are machined with high degree of precision. The finish gives them a very professional appearance. Best of all, my videocamera is held on axis very securely without any play or slop. The twist lock works much better than set screws to remove/reinsert EPs or the camera.
This review was provided courtesy of AgenaAstro.comApr 17, 2018
Well-Made ProductPros: Cons: Comments:
Due to winter weather, I haven’t had a chance to try out this Blue Fireball EP adapter yet. However, I have checked how the product is made and how it works with my eyepieces and diagonal. The quality is excellent and the fit with my EPs and the diagonal is better than expected. I can’t wait for the weather to clear and give me a chance to put the Blue Fireball to work. The only reason I did not give 5 stars is because I have not yet used it for observing. I bet that 5th star is coming up.
This review was provided courtesy of AgenaAstro.comFeb 5, 2018
Solved My ProblemPros: Cons: Comments:
This solved my problem with sag using a barlow and ZWO cameras.
This grabs and holds the barlow with camera firmly and keeps my optics on axis to give sharp images on the entire chip. Previously I had an Orion
self centering adapter but some of these loosen too easily when the camera was re-oriented.
This review was provided courtesy of AgenaAstro.com
LevEye New Member
- Skill Level
- Time with Product
Jan 16, 2018
- User Notes:
- Review by Chris L.
Blue Fireball delivers again!Pros: Cons: Comments:
This company delivers some of the highest quality machined parts I've ever purchased bar none. Don't hesitate to purchase a product made by them if your serious about the quality of your gear and you should be. Look up!
This review was provided courtesy of AgenaAstro.comJul 9, 2017
Fireball 2" to 1.25" Reducer Adapter ReviewPros: Cons: Comments:
Hi, This is my 3rd Fireball adapter as I have 3 scopes. These adapters are fantastic. Well made.
I recently purchased a 2" diagonal. While using it I ended up with a different 2" to 1.25" adapter
and I did not notice the thumb screw was hitting the lip or edge of the diagonal and chipping the finish.
I was not pleased. The Fireball adapter has no set screws and it centers the eyepiece, so that fixed that,
and now I don't have to worry about damaging my new diagonal.
The Fireball adapter is a premium quality piece.
I hope this review helps. Clear Skies!
This review was provided courtesy of AgenaAstro.comOct 10, 2016
Works well for 1-1/4 eyepieces, with "conditions"Pros:
Strong Construction,AccurateCons: Comments:
This works well on a 2 inch focuser if you have many 1- 1/4 eyepieces and don't want to be fumbling around interchanging your 1 -1/4 adapter in the dark. I ordered a couple and keep them on my 1-1/4 eyepieces permanently. Make sure the intended eyepiece comes to focus at least 1/2 inch out from fully racked in as the adapter adds about 1/4 inch "out focus" due to the "grip ring" on it.
This review was provided courtesy of AgenaAstro.comOct 9, 2015
Nice form and functionPros:
Accurate,Easy to Use,Beautifully made,Strong Construction,Lightweight,Compact,Perfectly FinishedCons: Comments:
I bought both the Antares and Blue Fireball twist lock 1.25"/2" adapters to compare... still using both after 3 months. The Antares has some sharp edges...not chamfered like the Blue Fireball. But the Antares has slightly different threads on the twist mechanism that grasp the eyepiece more quickly; the Blue fireball requires an extra twist. But the fit and finish of the Blue Fireball is much nicer than the Antares, e.g., edges are chamfered and filter threads are cleanly cut and it has a perfect anodized finish. The Antares filter threads are nearly unusable because they are so rough. I do like the twist lock form; it's clean, and centers the eyepiece nicely, maintaining a parallel position relative to the cone of light. If the Blue Fireball adapter locked eyepieces in more quickly, it would earn 5 stars from me.
This review was provided courtesy of AgenaAstro.comJun 17, 2015
Strong Construction,Lightweight,Accurate,Easy to Use,CompactCons:
Requires An Extra TwistComments:
I bought the Blue Fireball (BF) and an Antares to compare. The BF is beautifully made with clean threads that work smoothly and chamfered edges that make it more finished. The Antares has squared edges (can hang up on the compression ring undercut when inserting in a diagonal) and the threading for filters was very rough. The Antares tightens the eyepiece more quickly because the chamfer used to compress the inner plastic ring has a steeper cut. The BF requires more turning of the ring to fully tighten the eyepiece (about 1.5 turns compared to 1/4 turn). The BF is made without labeling and is all black anodized which I like; the Antares has silk screened lettering on the knurled tightening ring. Both hold the eyepiece securely, the Antares just does it more quickly. I chamfered the bottom edge of the Antares adapter on a lathe and removed the lettering with acetone on a Q-tip. It looks and functions better. But the threading will never be as smooth as the BF.
This review was provided courtesy of AgenaAstro.comNov 17, 2014
BlueFireBall. Universal hub for adaptersPros:
Accurate,Easy to Use,Strong Construction,LightweightCons: Comments:
BFB has every adapter you need to survive in the field.
Since I'm obsessed with collimation, correct and repeatable centering of every part in the lightpath is essential. BFB solves it. Highly recommended!
This review was provided courtesy of AgenaAstro.comApr 23, 2014
Cumbersome to usePros:
Difficult to UseComments:
The ring must be turned with 3 hand movements to release or tighten the eyepiece. Cumbersome and slow to switch eyepieces and more likely to knock the telescope off target.
The adapter holds the eyepiece tightly and centered, as intended.
This review was provided courtesy of AgenaAstro.comSort by