2 Inches 50 Degree 56mm Metal Parfocal Eyepiece Fully Astronomical
The 2 Inches 50 Degree 56mm Metal Parfocal Eyepiece is a fully multi-coated astronomical eyepiece with a 56mm focal length, designed for use with 2-inch (50.8mm) telescope systems.
Product Overview
The 2 Inches 50 Degree 56mm Metal Parfocal Eyepiece is a fully multi-coated astronomical eyepiece with a 56mm focal length, designed for use with 2-inch (50.8mm) telescope systems. It provides a 36.2mm eye point distance and a 47.8mm field diaphragm diameter, delivering a wide field of view suitable for deep-sky observation and planetary viewing. The 4-lens, 2-group optical design ensures sharp image quality across the field.
- Focal length56mm
- Eye point distance36.2mm
- Field diaphragm diameter47.8mm
- Lens coatingMulti-layer fully coated
- Lens group4 units / 2 groups
- Interface2 inches / 50.8mm
Key Benefits
- 56mm focal length provides a wide field of view for deep-sky and planetary observation
- 36.2mm eye point distance allows comfortable viewing with glasses or for users with longer eye relief needs
- 47.8mm field diaphragm diameter maximizes usable field area in 2-inch telescope systems
- Fully multi-coated lenses reduce glare and increase light transmission for clearer images
- Metal body construction offers durability and stable alignment during extended use
Application Scenarios
- Deep-sky observation of star clusters and nebulae using a 2-inch telescope system
- Planetary viewing with high contrast and edge-to-edge sharpness across the field
- Astronomical imaging setup where consistent parfocal alignment is required between eyepieces
- Telescope upgrades for amateur astronomers seeking improved eye relief and field clarity
- Educational astronomy labs using 2-inch telescope mounts for student observation sessions
Who It Is For
- Amateur astronomers using 2-inch telescope systems for visual observation
- Educational institutions teaching astronomy with telescope-based labs
- Astronomy clubs conducting public viewing nights with large-aperture telescopes
- Observation stations requiring durable, parfocal eyepieces for consistent focus across setups
- Amateur astrophotographers needing a reliable eyepiece for guiding and focusing
Problems It Solves
- Eyepieces with short eye relief make viewing difficult for users who wear glasses
- Uncoated or single-coated lenses reduce contrast and increase internal reflections in low-light conditions
- Non-parfocal eyepieces require refocusing when switching between magnifications
- Plastic or lightweight bodies can shift alignment during handling or temperature changes
- Small field diaphragms limit usable field of view in wide-field telescope systems
Technical Features
- Focal length: 56mm
- Eye point distance: 36.2mm
- Field diaphragm diameter: 47.8mm
- Optical design: 4 lenses in 2 groups
- Coating: Multi-layer fully coated
- Interface: 2 inches (50.8mm) barrel
- Parfocal: Yes, designed for consistent focus across eyepiece changes
- Angle of view: 50 degrees
- Metal construction for rigidity and long-term alignment stability
Specifications
| Focal length | 56mm |
|---|---|
| Eye point distance | 36.2mm |
| Field diaphragm diameter | 47.8mm |
| Lens coating | Multi-layer fully coated |
| Lens group | 4 units / 2 groups |
| Interface | 2 inches / 50.8mm |
| Angle of view | 50 degrees |
| Parfocal | Yes |
| Material | Metal |
| Weight | 0.6KG |
| Packing size | 155x110x80mm |
Specifications are taken from the AMADA product data for this item. Confirm critical dimensions with us in writing before ordering.
Customization Options
- Available in standard 2-inch metal barrel with 50-degree field of view
- No options for alternate focal lengths, coatings or barrel sizes provided in source
- No mention of OEM or private label configuration in source text
Comparison With Other Options
| 1.25-inch eyepiece | The 2-inch design offers a larger field diaphragm and wider field of view, ideal for deep-sky objects; the 1.25-inch is limited to smaller fields and lower light throughput. |
|---|---|
| Uncoated eyepiece | The multi-layer coating reduces internal reflections and increases contrast, especially in low-light conditions; uncoated versions show more flare and ghosting. |
| Plastic-bodied eyepiece | The metal body resists warping and maintains alignment under temperature changes; plastic bodies may shift over time or with handling. |
Use Guide
- Insert the eyepiece fully into the 2-inch focuser to ensure stable alignment and secure fit
- Check for parfocal consistency when switching between eyepieces; this model maintains focus across changes
- Clean the lens surfaces with a soft brush or lens cloth before use to avoid smudges
- Avoid touching the lens elements with fingers to prevent oil residue and coating damage
- Store in a dry, temperature-stable environment to prevent condensation and material stress
More From Astronomy Eyepiece
Astronomical Telescope Eyepiece 3X Magnifier Barrow Full Metal
View Details
1.25 Inch 2.5 -9mm Astronomical Telescope TMB Eyepiece 58 Degree
View Details
1.25'' 4mm 10mm 23mm 62 Degrees Astronomical Telescope Eyepiece
View Details
1.25" Plossl Eyepiece 3.6mm-40mm for 1.25" Astronomy Telescope
View Details
1.25 Inch 2X 3X 5X Extender Four-piece Green Film Lens Metal
View Details
31.75mm Eyepiece to C-mount Fixed Telescope Eyepiece Adapter
View Details
31.75mm Eyepiece to C-mount Adjustable Telescope Adapter
View DetailsGuides and Applications
Frequently Asked Questions
What is the eye point distance?
36.2mm, which allows comfortable viewing with glasses or for users needing longer eye relief.
Is this eyepiece parfocal?
Yes, it is designed to remain in focus when swapped with other parfocal eyepieces in the same system.
What telescope systems is it compatible with?
It fits any telescope with a 2-inch (50.8mm) focuser draw tube.
Can I use this with a 1.25-inch focuser?
No, the 2-inch barrel will not fit into a 1.25-inch focuser. Use an adapter only if the focuser supports 2-inch inserts.
What is the angle of view?
50 degrees, providing a wide but not extreme field for deep-sky and planetary observation.
Does it come with a lens cap?
The source does not specify a lens cap; it is recommended to use a protective cap during storage or transport.
Request A Price On The 2 Inches 50 Degree 56mm Metal Parfocal Eyepiece Fully Astronomical
Send quantity, destination and the application. We will confirm the configuration, the price and the lead time.