1.25" 20mm Erecting Imaging Eyepiece – Newtonian Reflector Telescope
1.25" 20mm Erecting Imaging Eyepiece – Newtonian Reflector Telescope
1.25" 20mm Erecting Imaging Eyepiece for Newtonian Reflector Telescopes
Upgrade your stargazing sessions with this 1.25-inch (20mm) Erecting Imaging Eyepiece, designed specifically for Newtonian reflector telescopes. Unlike standard reflector eyepieces that produce an inverted image, this erecting eyepiece corrects the orientation so you see a true, right-side-up view — perfect for terrestrial observations and making celestial navigation more intuitive.
Key Features
- Correct Upright Imaging: Delivers a fully erect, positive image — ideal for both astronomical and land-based viewing with your Newtonian reflector.
- 1.25-Inch (31.75mm) Barrel: Standard 1.25" fitting ensures broad compatibility with a wide range of reflector telescopes.
- 20mm Focal Length: Provides a comfortable, wide field of view for scanning the night sky or observing landscapes.
- Durable Construction: Built with a sturdy plastic body in classic black — lightweight yet robust for regular use.
- Easy to Use: Simply insert into your telescope's focuser like any standard eyepiece — no tools required.
Specifications
| Specification | Detail |
|---|---|
| Barrel Size | 1.25 inch (31.75mm) |
| Focal Length | 20mm |
| Image Orientation | Erect (Right-Side-Up) |
| Compatible Telescope Type | Newtonian Reflector |
| Color | Black |
| Material | Plastic |
| Country of Origin | Made in China |
What's in the Box?
- 1 × 1.25" 20mm Erecting Imaging Eyepiece
Please Note: Due to lighting and display differences, the actual product color may vary slightly from images. Measurement tolerance is ±1–3cm.
For more information on telescope optics and astronomy best practices, visit the NASA Telescope Guide.
Frequently Asked Questions
Q: What is an erecting imaging eyepiece and why do I need one for my Newtonian reflector telescope?
A: A standard Newtonian reflector telescope produces an inverted (upside-down) image due to its mirror design. An erecting imaging eyepiece uses additional internal lens elements to flip the image back to its correct, right-side-up orientation. This makes it much easier to observe terrestrial subjects and helps with intuitive celestial navigation when star-hopping across the night sky.
Q: Will this 1.25" erecting imaging eyepiece fit my telescope?
A: This eyepiece is designed for telescopes with a standard 1.25-inch (31.75mm) focuser barrel — the most common size found on consumer and entry-level Newtonian reflector telescopes. If your telescope accepts 1.25" eyepieces, this erecting imaging eyepiece should fit. Always verify your telescope's focuser diameter before purchasing.
Q: What magnification will I get with this 20mm erecting eyepiece?
A: Magnification is calculated by dividing your telescope's focal length by the eyepiece focal length. For example, if your telescope has a 1000mm focal length, using this 20mm eyepiece will give you 50× magnification (1000 ÷ 20 = 50). The 20mm focal length provides a wider, more comfortable field of view, making it great for scanning large areas of the sky.
Q: Can I use this eyepiece for daytime/terrestrial viewing?
A: Yes! Because this is an erecting imaging eyepiece — meaning it produces a corrected, right-side-up image — it is well-suited for daytime terrestrial viewing such as bird watching, landscape observation, or any ground-level subject, in addition to nighttime astronomy.