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2 Inches 50 Degree 56mm Metal Parfocal Eyepiece Fully Astronomical

2 Inches 50 Degree 56mm Metal Parfocal Eyepiece Fully Astronomical

2 Inches 50 Degree 56mm Metal Parfocal Eyepiece Fully Astronomical is a high-precision eyepiece for astronomical observation and optical inspection. Designed with a 56mm focal length, 50-degree apparent field of view, and multi-layer coated lenses, it delivers clear, bright images across the full field. The 2-inch (50.8mm) barrel fits standard astronomical and industrial optical systems. Constructed from durable metal with a parfocal design, it maintains focus when switching between eyepieces.

  • 50-degree apparent field of view provides wide, immersive viewing for astronomical and inspection tasks
  • Multi-layer coated lenses reduce glare and increase light transmission for clearer images
  • Metal body ensures durability and stable alignment in repeated use
  • Parfocal design maintains focus when swapping eyepieces, reducing adjustment time
  • 56mm focal length offers balanced magnification for medium to high power applications
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Technical features

  • Focal length: 56mm
  • Apparent field of view: 50 degrees
  • Eye point distance: 36.2mm
  • Barrel diameter: 2 inches (50.8mm)
  • Field diaphragm diameter: 47.8mm
  • Lens configuration: 4 units / 2 groups
  • Coating type: Multi-layer fully coated
  • Body material: Metal

Who it is for

  • Amateur astronomers using 2-inch telescope systems
  • Industrial inspection engineers requiring consistent focus across eyepiece changes
  • Research labs integrating eyepieces into optical measurement setups
  • Distributors sourcing standardized, durable eyepieces for optical equipment kits

Specifications

Focal Length56mm
Apparent Field of View50 degrees
Eye Point Distance36.2mm
Barrel Diameter2 inches / 50.8mm
Field Diaphragm Diameter47.8mm
Lens Configuration4 units / 2 groups
CoatingMulti-layer fully coated
Body MaterialMetal
Parfocal DesignYes
Packing Size155x110x80mm
Weight0.6KG

Use guide

  • Ensure telescope or microscope has a 2-inch eyepiece port before installation
  • Use with other parfocal eyepieces to maintain focus during magnification changes
  • Clean lens surfaces with lens tissue and appropriate cleaner to preserve coating

FAQ

Is this eyepiece compatible with 2-inch telescope ports?
Yes, the 2-inch (50.8mm) barrel is standard for most astronomical telescopes and industrial microscopes with 2-inch ports.
Does it have multi-layer coating?
Yes, the lenses are fully multi-layer coated to reduce reflections and improve image contrast.
What is the eye point distance?
36.2mm, which allows comfortable viewing even for users with glasses.
Is it parfocal?
Yes, the design maintains focus when switching between eyepieces in the same system.
What is the field diaphragm diameter?
47.8mm, which defines the usable image circle at the focal plane.

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