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Astro Hutech 1.25" Abbe Orthoscopic Eyepiece (Japan) - 4mm

4.2 (5 Reviews) Read Reviews Write Review
Brand Astro Hutech
Part Number OR04H
Availability available

Product Info

Manufacturer Description

* Closeout * All sales final. No returns accepted.

Astro Hutech has resurrected the famed orthoscopic eyepiece series that was sold under the label of Kasai Trading Company of Japan for many years. These eyepieces are based on the classic Abbe Orthoscopic (3 + 1 element) design. The true Abbe Orthoscopic has long been recognized for its ability to deliver the highest resolution, contrast and light throughput of any modern eyepiece design.

The three cemented elements are hand-aligned by Japanese craftsmen. All components of this eyepiece, including all glass and other materials, are manufactured and assembled fully in Japan. 

Fully multicoated lenses provide clean, high-contrast images suitable for optimum planetary and lunar viewing. On-axis images are essentially perfect and the orthoscopic design ensures freedom from distortion. Contrast and throughput are maximized by its minimum of lens elements, coatings, and only 4 air-to-glass surfaces.

Features:

  • Fully multi-coated optics
  • 42 degree apparent field of view.
  • Eye relief: ~80% of focal length
  • Smooth-sided 1.25" eyepiece barrels

Reviews

4.2 (Based on 5 Reviews) 80% of reviewers recommended this product.
Rating Distribution
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    1. Guest

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      User Notes:
      Review by Tim W.
      1494478886
      May 10, 2017

      4.0 Worth it for the Views of Jupiter Alone

      Pros:

      Cons:

      Comments:

      This eyepiece delivered highly detailed views of Jupiter in my 4" f/5.4 refractor. It was not my experience that the on center views were surpassed by higher-end, wide-field eyepieces of similar focal length, and it is possible that the views through this eyepiece were showing, if not greater detail, then more clarity of any given detail. Furthermore, the eye relief, field of view, and magnification were not nearly as challenging to use as expected with this telescope on an alt-az mount with manual slow motion controls and on a manually pushed and pulled 10" dobsonian.

      The only problem with the example that I received are patches of roughness around the field stop that appear to be related to the black paint used to darken the internals. This became a bit distracting while viewing the moon, so this does not replace my wide-fields in this regard. However, the level of detail accessible through this eyepiece makes up for this flaw to my eye. I really look forward to using this 4mm ortho when Saturn rolls around.

      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 Zane
      1483911313
      Jan 8, 2017

      4.0 A good eyepiece if you can use it

      Pros:

      Cons:

      Comments:

      I got this for Christmas from my parents. I use it with my Edmund 6" f/8 scope. This eyepiece is great if you have an instrument with a short enough focal length or large enough aperture to use it, and if you have tracking. Very sharp views.

      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 Mike of Portland, OR.
      1477612800
      Oct 27, 2016

      4.0 Great views

      Pros:

      Accurate,Quality Lenses

      Cons:

      Difficult to grasp

      Comments:

      Sharpest views of anything close to this price range. Sure the eye relief is a bit tight but the smaller field of view means you actually don't have to jam your eye in to see everything. The one negative is the upper housing is so short it's a little difficult to grasp out of your eyepiece case. Still I highly recommend.

      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 Makman of Princeton, New Jersey.
      1475280000
      Sep 30, 2016

      5.0 A very good planetary eyepiece

      Pros:

      high quality

      Cons:

      Comments:

      A high quality, short focal length, short eye relief eyepiece with a small field suitable for planetary, double star, or lunar viewing. Not a drop-dead eyepiece like a Zeiss orthoscopic in my opinion, but incredibly less expensive, and available, and as far as I can tell, Zeiss doesnt sell an orthoscopic with a focal length this short anyway. Don't get one if you expect a wide field, but do get one if you are after a high contrast view in a small field at a reasonable price. I personally like orthoscopics for this kind of viewing much more than plossls.

      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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      User Notes:
      Review by Astro Bob of Tucson, AZ.
      1391990400
      Feb 9, 2014

      4.0 Tiny

      Pros:

      Quality Lenses,Strong Construction,Accurate,Lightweight,Compact

      Cons:

      Difficult to Use

      Comments:

      This is a good quality eyepiece, but the 3.9mm eye lens is tiny. Combine that with only 3.9mm of eye relief and this eyepiece is difficult to use.

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

      This review was provided courtesy of AgenaAstro.com

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      Specifications

      Apparent Field of View 42°
      Barrel Size 1.25" (31.7mm)
      Bolt Case Included Yes - Free Agena Eyepiece Container
      Bolt Case Size Agena 37x60mm
      Coatings Fully Multi-Coated
      Design Abbe Orthoscopic
      Height (without Eye Guard) 1.50" (38.0mm) To be updated
      Max Width 1.34" (34.0mm) To be updated
      End Caps 2
      Eye Lens Diameter 0.15" (3.9mm) To be updated
      Eye Relief by Design 3.2mm
      Filter Threads Standard 1.25" Filter Thread (M28.5 x 0.6)
      Focal Length 4mm
      Lens Elements 4
      Lens Groups 2
      Rubber Eye Guard No
      Blackened Lens Edges Yes
      Manufacturer Astro Hutech
      Eyepiece Focal Length 5mm and Under
      Eyepiece Field of View Up to 50 degrees
      Eyepiece Series Astro Hutech Abbe Ortho
      Barrel Type Smooth sided
      Eyepiece Weight 2.20oz (62.37g)