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1.25 Inch 2X 3X 5X Extender Four-piece Green Film Lens Metal

1.25 Inch 2X 3X 5X Extender Four-piece Green Film Lens Metal

The 1.25 inch 2X 3X 5X extender is a four-piece metal lens assembly with green film coating for astronomy eyepieces. It features a 1.25-inch (31.7mm) interface, built-in copper ring for secure fit, and a filter thread for accessory use. Includes cap and plug to prevent dust ingress. Designed for use with 1.25-inch eyepieces in telescopic systems.

  • Four-piece fully multi-layer green film lens reduces glare and improves contrast
  • Metal construction ensures durability and stable optical alignment
  • Built-in copper ring protects the eyepiece body during insertion and use
  • 1.25-inch filter thread allows attachment of additional filters or accessories
  • Cap and plug included to prevent dust and damage when not in use
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Technical features

  • Magnification options: 2X, 3X, 5X (each unit is a separate extender)
  • Interface size: 1.25 inch (31.7mm) for standard eyepieces
  • Filter thread: 1.25-inch diameter for attaching filters or accessories
  • Lens construction: four-piece fully multi-layer green film coated elements
  • Built-in copper ring for secure fit and protection of eyepiece body
  • Cap and plug included for dust protection
  • All extenders made from metal materials for structural stability

Who it is for

  • Astronomy hobbyists using 1.25-inch eyepieces
  • Importers sourcing accessories for telescope kits
  • Distributors adding extenders to optical accessory catalogs

Specifications

Magnification2X / 3X / 5X
Interface Size1.25 inch (31.7mm)
Filter Thread1.25-inch
Lens ConstructionFour-piece fully multi-layer green film
MaterialMetal
Included AccessoriesCap, plug, copper ring

Use guide

  • Select the desired magnification (2X, 3X, or 5X) based on required focal length extension
  • Insert the extender into the telescope’s eyepiece holder, ensuring the copper ring secures the eyepiece
  • Attach a filter or accessory using the 1.25-inch filter thread if needed
  • Use cap and plug when not in use to prevent dust accumulation

FAQ

What magnification options are available?
2X, 3X, and 5X extenders are available as separate units.
Is the interface compatible with standard 1.25-inch eyepieces?
Yes, the 1.25-inch (31.7mm) interface is standard for most astronomy eyepieces.
Does it include a cap and plug?
Yes, each extender includes a cap and plug for dust protection.
What is the purpose of the copper ring?
The built-in copper ring ensures a secure fit and protects the eyepiece body during insertion and use.
Can I use this with a filter?
Yes, the 1.25-inch filter thread allows attachment of external filters.

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