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 achromatic lens set with green multi-layer coating, designed for use with 1.25-inch astronomical eyepieces.
Product Overview
The 1.25 inch 2X 3X 5X extender is a four-piece achromatic lens set with green multi-layer coating, designed for use with 1.25-inch astronomical eyepieces. It provides fixed magnification extension without changing the eyepiece, and features a metal body with a copper ring to protect the inserted eyepiece. The interface includes a 1.25-inch filter thread and comes with a dust cap and plug.
- Magnification2X, 3X, 5X
- Lens typeFour-piece achromatic
- CoatingFully multi-layer green film
- Interface1.25-inch / 31.7mm
- Filter thread1.25-inch
- MaterialMetal
Key Benefits
- Provides fixed magnification extension of 2X, 3X, or 5X without changing the eyepiece
- Four-piece fully multi-layer green film lens reduces chromatic aberration and improves contrast
- Metal body with copper ring protects the eyepiece barrel during insertion and removal
- 1.25-inch filter thread interface allows direct attachment to standard 1.25-inch eyepieces
- Dust cap and plug included to prevent contamination when not in use
- Achromatic design maintains image clarity across all magnification levels
Application Scenarios
- Extending the magnification of a 1.25-inch astronomical eyepiece for planetary or lunar observation
- Using the 5X extender to increase detail on small celestial features without swapping eyepieces
- Protecting the eyepiece body during frequent mounting and dismounting with the copper ring
- Preventing dust ingress during storage or transport with the included cap and plug
- Maintaining consistent optical performance across multiple magnification settings
Who It Is For
- Amateur astronomers using 1.25-inch eyepieces for visual observation
- Educational astronomy programs requiring durable, reusable accessories
- Observation teams needing quick magnification changes without eyepiece swaps
- Field users who require dust protection for optics in variable environments
Problems It Solves
- A fixed magnification eyepiece limits the ability to adjust power without changing the entire unit
- Frequent insertion and removal of eyepieces risks damage to the barrel or lens mount
- Lack of protection during storage leads to dust accumulation on the eyepiece end
- Uncoated or single-layer lenses introduce color fringing and reduced image clarity
- No standard interface for extending magnification without a separate adapter system
Technical Features
- Four-piece achromatic lens design with multi-layer green coating
- Fixed magnification options: 2X, 3X, 5X
- 1.25-inch (31.7mm) interface with filter thread
- Copper ring built into the interface to protect the eyepiece body
- Includes dust cap and plug for storage and transport
- Metal construction for durability and thermal stability
Specifications
| Magnification | 2X, 3X, 5X |
|---|---|
| Lens type | Four-piece achromatic |
| Coating | Fully multi-layer green film |
| Interface | 1.25-inch / 31.7mm |
| Filter thread | 1.25-inch |
| Material | Metal |
| Protective feature | Built-in copper ring |
| Included accessories | Dust cap, dust plug |
Specifications are taken from the AMADA product data for this item. Confirm critical dimensions with us in writing before ordering.
Customization Options
- Available in 2X, 3X, or 5X magnification variants
- All units supplied with standard 1.25-inch interface and copper ring
- No custom lens coatings or materials offered beyond the standard green film
Comparison With Other Options
| Single-element extender | The four-piece achromatic design reduces chromatic aberration and improves edge sharpness compared to single-element extenders. |
|---|---|
| Plastic-bodied extender | The metal body provides better durability and thermal stability, reducing expansion or warping under temperature changes. |
| Extender without protective ring | The built-in copper ring prevents wear on the eyepiece barrel during repeated use, extending the life of the eyepiece. |
Use Guide
- Ensure the 1.25-inch eyepiece is clean before inserting into the extender
- Insert the eyepiece into the extender until the copper ring makes contact with the barrel
- Do not force the connection; the fit should be snug but not tight
- Use the dust cap and plug when the extender is not in use to prevent contamination
- Clean the lens surfaces with a soft brush or lens cloth before use
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Frequently Asked Questions
What magnifications are available?
The extender is available in 2X, 3X, and 5X fixed magnification options.
Is the extender compatible with all 1.25-inch eyepieces?
Yes, it uses the standard 1.25-inch interface with a filter thread, compatible with most 1.25-inch eyepieces.
Does the extender include a dust cap and plug?
Yes, the package includes a dust cap and a dust plug for protection during storage.
Can I use this extender with a telescope that has a 1.25-inch focuser?
Yes, the 1.25-inch interface allows direct use with any telescope or scope that accepts 1.25-inch accessories.
Is the lens coating effective for reducing glare?
Yes, the fully multi-layer green film coating reduces reflections and improves contrast in low-light conditions.
Is the copper ring removable?
No, the copper ring is integrated into the metal body and not removable.
Request A Price On The 1.25 Inch 2X 3X 5X Extender Four-piece Green Film Lens Metal
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