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Antares 1.25" Kellner Eyepiece with Focusable Cross-Hair - 27mm

4.4 (25 Reviews) Read Reviews Write Review
Brand Antares
Part Number K27X
Availability available

Product Info

Manufacturer Description

Tired of struggling to perfectly center alignment stars? Crosshairs out of focus without your glasses? Here's the solution!

This is a high-quality Antares 1.25 27mm Kellner eyepiece with focusable crosshairs (single), perfect for alignment and tracking. To obtain razor-sharp focusing of the crosshairs, merely turn the upper part of the eyepiece. Focus markings on the eyepiece barrel facilitate consistent focusing from session to session, no matter what the sky conditions. This reticle focusing feature - rarely available in competing crosshair eyepieces - is a great boon if your eyesight is not 20/20 and if you wear glasses.

Whether you want better Go-To, or more precise tracking, a crosshair eyepiece is a must. You can combine this eyepiece with a barlow lens for even higher power and more accurate alignment.

Please note that this eyepiece is not threaded to accept illuminators, so you cannot convert this into an illuminated reticle eyepiece.

Reviews

4.4 (Based on 25 Reviews) 96% of reviewers recommended this product.
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    1. Guest

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      Review by Dim of Athens, Greece.
      1440460800
      Aug 24, 2015

      3.0 Nice, but could be better

      Pros:

      Easy to Use,Lightweight

      Cons:

      Poor Lens Quality

      Comments:

      All in all it is not bad, however, the crosslines are loose, and they give the impression of a "wavy cross". I had to modify it, to get a good straight-line crosshair.

      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 eli of Teaneck, NJ.
      1427500800
      Mar 27, 2015

      5.0 Works well

      Pros:

      Lightweight,Easy to Use,Compact,Accurate

      Cons:

      Comments:

      Excellent, fills a real need.

      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 FredB of Mesa, AZ.
      1424822400
      Feb 24, 2015

      5.0 Perfect for precise GoTo alignment

      Pros:

      Easy to Use

      Cons:

      Comments:

      Works perfectly for more precise GoTo alignments as well as daytime finder/scope alignments. I was worried that a non-illuminated reticle might prove too dim for use, but not at all (and my eyesight is not that good anymore). Looks sturdy enough, and for the limited amount of use it will get, should last a long time.

      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 Moose in Houston of Houston, Texas.
      1424563200
      Feb 21, 2015

      3.0 Works OK

      Pros:

      Cons:

      Comments:

      I wanted more accurate alignment between my telescope and my spotter, this did the deed. Came in a nice Agena plastic "bolt" case too.

      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 Tom of Cranston RI.
      1424563200
      Feb 21, 2015

      4.0 A good eyepiece for the price

      Pros:

      Lightweight,Compact

      Cons:

      Comments:

      It would be better if this eyepiece has a wider field of view (70 deg). And yes, the price will change if the fov is wider.

      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 Sky Watcher of Australia.
      1421366400
      Jan 15, 2015

      3.0 Low build quality but works somewhat OK

      Pros:

      Lightweight

      Cons:

      Low Build Qiality

      Comments:

      I was looking for an eyepiece with reticle, so that I could use it for a 3-star alignment of my recently-bought Celestron telescope with the GO-TO functionality. Most of the reticle eyepieces had a focal length of 12 mm, which provided too little field of view. This one was at 27 mm. "Perfect", I thought.

      My first impression. The build quality is not good. The eyepiece does not fall apart, however it is noticeable the materials are of not high quality, and the parts do not fit too well together. For example, there is a snag on the ring which holds the reticle wires. I can see this snag at the edge of the aperture when looking through the eyepiece. The single cross reticle wires are not the thinnest which would not translate to the high precision aiming. One could adjust the focus of the eyepiece, so that the reticle wires could come into focus. This feature is implemented for the people with short-sightedness or long-sightedness, so that they could adjust the focus. There are markings on the focussing ring indicating zero power, positive and negative power directions... however, there is no complementary marking on the eyepiece body against which one would align the focussing ring. Also, the focussing ring rotates without sufficient friction against the eyepiece body.

      In conclusion, I believe the reticle eyepiece is worth only half of the asking price... and for the half price, I would recommend it to a friend.

      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 brucepiano of New England.
      1409961600
      Sep 5, 2014

      5.0 Exellent for alignment stars

      Pros:

      Accurate,Compact,Easy to Use,Lightweight

      Cons:

      Comments:

      For years, I often struggled with getting low warp factors for my 10 inch Orion Intelliscope. General opinion is not in favor of a centering eyepiece, so I put off the purchase. The usual advice is to defocus the star in the eyepiece to center it. It doesn't work for me.

      I tried everything- a new alt encoder, choosing stars which are more degrees apart. No success at consistently low warp factors.

      I decided after buying some 50MM O-rings from Agena (which are better than the OEM on the Orion 50mm finder) to also buy a centering eyepiece. Bingo- each time I use the eyepiece I get a lower warp factor. The first try!

      The eyepiece is not for viewing. It is simply a centering eyepiece. I don't recommend unscrewing the bottom part of the eyepiece and taking out the delicate cross hair assembly. Best to keep the eyepiece assembled. It has an excellent case. Also- a Telrad and optical finder can be exactly centered with this eyepiece. Formerly, I used the Telrad as a pointer, but I am finally using it to find DSO's.

      Agena service is excellent. Very responsive.

      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 Child of the Stars of SSI, GA.
      1390694400
      Jan 25, 2014

      3.0 Nice price, but QC needs to be tightened

      Pros:

      Easy to Use,Lightweight

      Cons:

      Comments:

      I use this eyepiece in my Agena 50mm finder scope as an aid in getting the guide scope optically aligned with my OTA. It does the job, but I was not impressed with the mounting of the single intersecting crosshairs. It appears that they were mounted "loosely" which results in them not being perfectly straight and/or orthogonal to each other. Minor issue for what I use it for, but has the potential for being a fine, inexpensive finder eyepiece if the crosshair QC issue is addressed.

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

      This review was provided courtesy of AgenaAstro.com

    9. BigZ

      BigZ New Member

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      Review by 2big2tall of Nottingham, NH.
      1381622400
      Oct 12, 2013

      4.0 Great value

      Pros:

      Lightweight,Quality Lenses,Accurate

      Cons:

      Comments:

      The Antares crosshair eyepiece is very adequate for my purpose in synchronizing the views between my main telescope and its finder scope. I also use it to do "drift" polar aligning without and then with a Barlow lens; however, thinner crosshairs would be preferable. Also, the focusing ring is too easily moved out of adjustment if one's fingers accidently touch it, but not to an unusable extreme. The lenses are very good for a simple Kellner design.

      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 DIM104 of Greece.
      1341014400
      Jun 29, 2012

      5.0 A necessary and smart buy eyepiece.

      Pros:

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

      Cons:

      Comments:

      Very good eyepiece, great clarity and ease of alignment and can be used as a simple eyepiece if you remove the cross after being unscrewed the bottom (easily removed).

      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 Max Headroom of Vail, AZ.
      1341014400
      Jun 29, 2012

      4.0 Good finder eyepiece

      Pros:

      Quality Lenses,Accurate,Lightweight,Easy to Use

      Cons:

      Comments:

      Has surprisingly good image quality with short-focus objectives, making it a good finder eyepiece. Also useful for estimating position angles with direction of drift as a reference. The barrel diameter seems slightly small, so it is a loose fit in my 1.25" adapter.

      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 Astronewb of Canton, CT.
      1326153600
      Jan 9, 2012

      5.0 Excellent Product

      Pros:

      Does what it says

      Cons:

      Comments:

      This is a very useful EP. I use it in addition to the 12.5mm illuminated EP I have, especially when the object I goto doesn't fall into the FOV of the EP..slip in the 27mm, center the object and then finish up with the 12.5. Use it all the time.

      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 Tigerio of Uvalde, Texas.
      1320624000
      Nov 6, 2011

      5.0 Focusable Cross Hair Eyepiece

      Pros:

      Easy to Use,Lightweight

      Cons:

      Comments:

      Good eyepiece for land watching and testing out scope for alignments and such.

      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 Steve of Orlando, FL.
      1320537600
      Nov 5, 2011

      5.0 A must-have for computerized telescopes

      Pros:

      Strong Construction,Quality Lenses,Easy to Use,Accurate,Lightweight

      Cons:

      Comments:

      I have a NexStar 5SE and a CGEM 800. They both work better when you consistently align the star in the exact center. I use this eyepiece on my NexStar. The price is excellent and you can focus the crosshairs. For the CGEM I use an illuminated eyepiece that cost $100 but you can't focus the crosshairs on that one. Ideally you would have illumination, ability to focus the reticle, and a wide field of view. I usually use the NexStar in the city where there is a lot of light everywhere and the fact that the reticle is not illuminated is not a problem. Save your money and buy this eyepiece.

      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 Mike of Glen Burnie, MD.
      1319846400
      Oct 28, 2011

      5.0 I would highly recommend this eyepiece

      Pros:

      Quality Lenses,Strong Construction,Easy to Use,Accurate

      Cons:

      Comments:

      This is a wonderful eyepiece for assisting in aligning my telescope. It is also a great value. I found it easy to use and does the job well. Focusing is smooth. In my mind this is a practical way of aligning my scope in spite of all the hype about an illuminated reticule.

      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 Pat of Lake Stevens, WA.
      1319846400
      Oct 28, 2011

      5.0 Excellent eyepiece! Excellent seller!

      Pros:

      Nice and sharp

      Cons:

      Comments:

      Great on my CGEM

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

      This review was provided courtesy of AgenaAstro.com

    17. dvoprvb

      dvoprvb New Member

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      Review by dvoprvb of Plainville, CT.
      1313107200
      Aug 11, 2011

      5.0 Good focus-able eyepiece

      Pros:

      Easy to Use,Quality Lenses,Lightweight,Strong Construction

      Cons:

      Comments:

      The cross-hairs are easily visible, no need for an illuminated reticle when you're doing an alignment. Eyepiece has focus travel.

      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 telescope tom of Tucson, Arizona.
      1307145600
      Jun 3, 2011

      4.0 Great Finder Eyepiece

      Pros:

      Quality Lenses,Accurate,Strong Construction,Compact

      Cons:

      Comments:

      If you have a finder that uses 1.25" eyepieces, this is the one to have. Great clarity and the focusable cross hairs is perfect. If only they made a 33mm or so for lower power and wider field of view. This one will do till then.

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

      This review was provided courtesy of AgenaAstro.com

    19. Guest

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      Review by Jone of Chevy Chase, MD.
      1306800000
      May 30, 2011

      4.0 This is a decent crosshair veyepiece

      Pros:

      Accurate,Compact,Strong Construction

      Cons:

      Comments:

      This is a decent crosshair eyepiece for centering your scope. No need for illuminated reticle.

      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 juanirias of Honduras.
      1301961600
      Apr 4, 2011

      5.0 Need for quick calibration

      Pros:

      Accurate,Strong Construction,Quality Lenses,Compact

      Cons:

      Comments:

      Need for quick calibration, you need not be illuminated, good optics, very nice rotation adjustment

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

      This review was provided courtesy of AgenaAstro.com

    21. hdtran

      hdtran New Member

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      Review by hdt of NM.
      1292716800
      Dec 18, 2010

      5.0 Really helps with alignment!

      Pros:

      Compact,Accurate

      Cons:

      Comments:

      If you have a Nexstar or similar scope, this is a great accessory for centering the alignment stars! Makes your alignments a snap! The crosshairs are easily visible, no need for an illuminated reticle when you're doing an alignment. Excellent value!

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

      This review was provided courtesy of AgenaAstro.com

    22. hdtran

      hdtran New Member

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      Review by hdt of Albuquerque, NM.
      1273363200
      May 8, 2010

      4.0 Works fine!

      Pros:

      Accurate,Strong Construction

      Cons:

      Comments:

      Great for centering objects in eyepiece before switching to a shorter focal length. One hint: Set up in daytime. Then, take either a silver marker, or some pieces of tape, and mark your preferred orientation for the crosshair & the eyepiece focus on the eyepiece!

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

      This review was provided courtesy of AgenaAstro.com

    23. Guest

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      Review by Pepperonihead of San Pedro, CA.
      1249776000
      Aug 8, 2009

      5.0 Antares Kellner Cross Hair.

      Pros:

      Accurate

      Cons:

      Comments:

      The product works great for what it is supposed to do. It really helps center your alignment star for go too telescopes. It is not bad for regular observing either! Built well. Great bang for your buck.

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

      This review was provided courtesy of AgenaAstro.com

    24. Guest

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      Review by Jeff the Stargazer of Georgia.
      1246579200
      Jul 2, 2009

      5.0 Well-built, great with alignments!

      Pros:

      Strong Construction,Accurate

      Cons:

      Comments:

      This is a really well-built reticle eyepiece. It uses the proven Kellner optical design. It does what I bought it for, making good setup alignments. I liked the fact that it was simple, robust, and didn't require batteries like the illuminated models.

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

      This review was provided courtesy of AgenaAstro.com

    25. Guest

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      Review by Chuck of Denver, CO.
      1243468800
      May 27, 2009

      5.0 Antares Cross-Hair Eyepiece

      Pros:

      Strong Construction,Compact,Accurate

      Cons:

      Comments:

      This eyepiece makes setting up my computerized Celestron mount a breeze. Comes in a nice Agena case, too.

      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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      Specifications

      Apparent Field of View 50°
      Barrel Size 1.25" (31.7mm)
      Bolt Case Included Yes - Free Agena Eyepiece Container
      Bolt Case Size Agena 42x80mm
      Design Kellner
      Height (with Eye Guard) 2.81" (71.3mm)
      Max Width 1.49" (37.8mm)
      End Caps 2
      Eye Lens Diameter 0.65" (16.4mm)
      Eye Relief by Design 13mm
      Filter Threads No
      Focal Length 27mm
      Lens Elements 3
      Rubber Eye Guard Yes
      Manufacturer Antares
      Eyepiece Focal Length 20.1mm - 30mm
      Barrel Type Smooth sided
      Eyepiece Weight 2.40oz (68.04g)