Dismiss Notice
New Cookie Policy
On May 24, 2018, we published revised versions of our Terms and Rules and Cookie Policy. Your use of AstronomyConnect.com’s services is subject to these revised terms.

More Views

Kokusai Kohki Japanese 1.25" Orthoscopic Eyepiece - 6mm

4.0 (1 Reviews) Read Reviews Write Review
Brand Kokusai Kohki
Part Number -
Availability

Product Info

Manufacturer Description

Japanese production of this eyepiece focal length has ended! Our remaining stock is all that we will ever have available so grab these before they're gone for good.

Top Notch workmanship, design and optical performance Maximum sharpness, resolution, throughput and contrast at a very reasonable price

Kokusai Kohki's world famous lineup of orthoscopic eyepieces sport the highest quality Japanese workmanship, sharp "eagle-eye" views and excellent color correction. Their OR eyepieces will satisfy even the most demanding planetary observer, including those used to much more expensive and "flashy" name brand eyepieces, but at 1/4 ~1/10 the cost!

Kokusai Kohki's OR eyepieces are all lovingly handmade, one at a time by craftsmen at the Tokyo factory. In production now for over 40 years, their optical, mechanical and design quality is something you can be proud of for years to come. High magnification inclined apo-refractor, Maksutov, SCT and Mewlon users will be especially pleased with their planetary and double star viewing performance. The gorgeous barrel design includes snug filter threads and a tight, sharp field stop that precisely defines the field of view.

For maximum image definition, contrast and light transmission, the eye lens of each eyepiece is multicoated, and all other surfaces are magnesium flouride coated. Eye relief is typical for this ortho design and images merge well when used in a binocular viewer. Apparent field of view of all focal lengths varies between 41 and 47 degrees.

This level of quality comes at a very low price, meaning that getting even an entire set or doubling up for binoviewing is a more than reasonable proposition. Eyepieces weigh in at 65~95 grams for 1.25" and eye lens diameters for the shortest three focal lengths range from 3mm for the OR4, 4mm for OR 5 and 5mm for OR6.

Kokusai Kohki's 1.25" orthoscopic eyepieces are available in 4mm, 5mm, 6mm, 7mm, 9mm, 12.5mm, 18mm and 25mm focal lengths. Every OR eyepiece includes plastic caps on both ends.

Reviews

4.0 (Based on 1 Reviews) 100% of reviewers recommended this product.
Rating Distribution
Sort by
  • Date
  • Rating
  • Useful
    1. Guest

      Skill Level
      Unknown
      Time with Product
      Unknown
      User Notes:
      Review by scloke of Kuala Lumpur, Malaysia.
      1354492800
      Dec 2, 2012

      4.0 Especially for planetary views.

      Pros:

      Lightweight,Quality Lenses,Compact

      Cons:

      Difficult to Use

      Comments:

      This really is a wonderful eyepiece for spotting planets at high magnification, as the views are tack-sharp on axis even on my SCT. Another good point is that the eyepiece is mostly cylindrical without any bulging parts, giving a good fit into a typical Barlow or camera adapter. The main drawback is that the field of view is very narrow as is typical of orthoscopics, and the object in question can be quite hard to locate.

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

      This review was provided courtesy of AgenaAstro.com

    Sort by
    • Date
    • Rating
    • Useful

      Specifications

      Apparent Field of View 43°
      Barrel Size 1.25" (31.7mm)
      Bolt Case Included Discontinued Item
      Bolt Case Size Agena 37x60mm
      Coatings Multi-Coated
      Design Orthoscopic
      End Caps 2
      Eye Lens Diameter 5mm
      Eye Relief by Design 4.8mm
      Filter Threads Standard 1.25" Filter Thread (M28.5 x 0.6)
      Focal Length 6mm
      Rubber Eye Guard No
      Blackened Lens Edges Yes
      Manufacturer Kokusai Kohki
      Eyepiece Focal Length 5.1mm - 10mm
      Eyepiece Field of View Up to 50 degrees
      Eyepiece Series KK Orthoscopics
      Barrel Type With safety undercut
      Eyepiece Weight 3.17oz (89.87g)