Criterion Ortho 4mm 1.25" Vintage Eyepiece - Circle Y
| Availability: | In stock |
| Delivery time: | Hurry! Buy Now before it is GONE! |
Condition
Pre-Owned / Vintage. The eyepiece has been cleaned for dust and anything that may affect viewing. Any dust on the eyepiece will not affect the viewing or operation. With its age and previous use, the barrel displays some wear. It is in excellent working condition and is operating as intended.
Description
The Criterion Ortho 4mm is a classic vintage astronomical eyepiece featuring a traditional orthoscopic optical design and standard 1.25-inch barrel. Manufactured by Criterion and marked Circle Y, this eyepiece is designed for high-magnification planetary, lunar, and double-star observing. Its simple optical design is valued by enthusiasts of vintage astronomy equipment for its sharp, high-contrast views and straightforward construction.
Key Specifications
- Manufacturer: Criterion
- Model: Ortho 4mm
- Focal Length: 4mm
- Eyepiece Type: Orthoscopic
- Barrel Size: 1.25"
- Magnification: Dependent on telescope focal length
- Focus: Fixed optical eyepiece
- Field of View: Approximately 40–45°
- Optical Design: Orthoscopic
Features
- 4mm focal length provides very high magnification for detailed lunar and planetary observation.
- Orthoscopic design is known for good sharpness and contrast, making it particularly well suited for observing fine planetary details.
- Standard 1.25" barrel fits most modern and vintage telescopes accepting 1.25" accessories.
- Classic vintage construction appeals to collectors and observers who enjoy traditional astronomical equipment.
- Particularly useful for:
- Lunar observing
- Planetary observing
- Double stars
- High-resolution viewing
- Vintage telescope setups