Vixen HR-Series 3.4mm Astronomical Eyepiece (1.25")

SKU: VX37135

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Questions & Answers

BRYAN M : According to the image the eyepiece focal length is 2.4 mm but the website says it is 3.4 mm. Which is correct?ANDREW R : 3.4mm as stated. Product images are for illustrative use only.

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Vixen HR 3.4mm Eyepiece Specifications

  • Coating

    AS-Coated

  • Focal Length

    3.4mm

  • Eye Relief

    10.0mm

  • Apparent Field of View

    42 Degree

  • Barrel Diameter

    1.25" (3.17cm)

  • Weight

    4.8 oz (136.1g)

  • UPC Code

    4955295371358

About Vixen HR 3.4mm Eyepiece

The HR 304 mm Eyepieces are designed for observation of subtle differences of the surface of the planets. The high resolution eyepiece deliver breathtaking, superb images with extremely high level of definition and contrast.

Approx. 100% Strehl ratio on the axis
The resolving power outperforms similar eyepieces designed for planetary viewing. The HR-series maintains more than a 97% Strehl ratio to the edge of the field of view when combined with a Vixen AX103S refractor. In comparison, the ratio is about 90% with the use of a standard LV2.5mm eyepiece.

Suitable for Newtonian telescopes with fast primary mirrors
The HR-series work extremely well with the Vixen R200SS as it has the ability to correct coma aberration. Even at the edge of the field of view, the HR-series have a 93% Strehl ratio. In comparison the Strehl ratio with use of the LV2.5mm falls rapidly as the viewing object is moved toward the edge of the field of view. The ratio is only 93% at a fifth from the center and 0% at the edge. Conventional eyepiece specifications merely show the performance when an object is put in the center of the field of view of the eyepiece. As a result, the resolving power declines as you move toward the edge of the field of view. The HR-series are best suited for observing the surface of the moon to extend your view to the entire field of view.

Simple 5 elements in 3 groups lens design
While most eyepieces are constructed from 7 or 8 lens elements, the Vixen HR-series are constructed with a 5 lens elements design to achieve the largest possible transmission of light. The absorption and reflectio of light are virtually eliminated.

Enhanced light transmission characteristics
The Vixen AS-coating achieves extremely high light transmission of 99.9% per lens surface. It is applied to each of the surfaces to deliver extremely high contrast images.

Complete stray light correction
The grooved lens frame construction contributes to the reduction of stray light. The inside of the eyepiece is perfectly threaded and blackened to prevent deterioration of the image from stray light. The inner baffle rings effectively stop any stray light. Even a hint of reflection which might occur on the tip of the sleeve is eliminated.

Vixen HR 3.4mm Eyepiece Features

  • Approx. 100% Strehl ratio on the axis
  • Suitable for Newtonian telescopes with fast primary mirrors
  • Simple 5 elements in 3 groups lens design
  • Enhanced light transmission characteristics
  • Complete stray light correction
  • Quality product that is Made in Japan

Key Features

  • Approx. 100% Strehl ratio on the axis
  • Suitable for Newtonian telescopes with fast primary mirrors
  • Simple 5 elements in 3 groups lens design
  • Enhanced light transmission characteristics
  • Complete stray light correction
  • Quality product that is Made in Japan

What's in the box:

  • HR-Series 3.4mm Astronomical Eyepiece (1.25 ")
  • Vixen 5 Year Limited Warranty