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Kasai Trading Co. 1.25" AstroPlan Eyepiece - 5mm

5.0 (1 Reviews) Read Reviews Write Review
Brand Kasai Trading Co.
Part Number K-AP05
Availability available

Product Info

Manufacturer Description

The Kasai Astroplan eyepieces are excellent all-round eyepieces, especially for the discerning lunar or planetary observer. They combine the crisp definition of orthoscopic eyepieces with good field correction over a larger 50-deg apparent field of view. While these are good performers even at shorter focal ratios, they really come into their own with sharp, crisp, contrasty views in long focal ratio scopes.

Superior lens polishing with multi-coating on all internal air-glass surfaces (so these are FMC), a modern 5 element design, edge blackened optics, engraved lettering, end caps, and standard filter threaded barrels attest to the excellent craftsmanship of these Japanese eyepieces. The body of the eyepiece is made from strong, lightweight aluminum and features a knurled rubber ring, while the 1.25" barrel is made from chrome-plated brass.

These optical characteristics coupled with their small size make these Kasai AstroPlan eyepieces perfect for visual observation (especially in binoviewers) as well for afocal projection photography.

Reviews

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

      Skill Level
      Unknown
      Time with Product
      Unknown
      User Notes:
      Review by telescope tom of Tucson.
      1436140800
      Jul 5, 2015

      5.0 Masuyama clones

      Pros:

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

      Cons:

      Comments:

      Everybody was looking for the Masuyama 5 element plossls. Well these are it. Compared this 5mm to a Ultima 5mm (they look exactly alike on the outside). They couldn't be more different. The Kasai is so much better optically, it is worth every penny. Wish they had more focal lengths, you know like 4, 6, 7, 8, etc. I would buy them all.

      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 42x60mm
      Coatings Fully Multi-Coated
      Height (without Eye Guard) 34.6mm
      Max Width 35.6mm
      End Caps 2
      Eye Lens Diameter 4.6mm
      Eye Relief by Design 4.3mm
      Filter Threads Standard 1.25" Filter Thread (M28.5 x 0.6)
      Focal Length 5mm
      Lens Elements 5
      Lens Groups 3
      Rubber Eye Guard No
      Blackened Lens Edges Yes
      Manufacturer Kasai Trading Co.
      Eyepiece Focal Length 5mm and Under
      Eyepiece Field of View Up to 50 degrees
      Eyepiece Series Kasai AstroPlan
      Barrel Type Smooth sided
      Eyepiece Weight 2.20oz (62.37g)