Baader Planetarium Ortho Classic eyepiece 10mm, 50°, 1.25″
Some optical designs simply stand the test of time. The orthoscopic eyepiece - also known as the Abbe eyepiece - is one of them. Since its introduction around 1880, it has remained among the best eyepieces for planetary and lunar observation, thanks to its optical purity, minimal distortion and excellent contrast. Baader Planetarium has not forgotten this legendary design - instead, the company has brought it into the modern era with great care and precision.
Design and optical construction
The Ortho Classic eyepiece is based on the proven orthoscopic eyepieces from the astronomical program of Carl Zeiss - one of the most prestigious sources of inspiration any manufacturer could draw from. The 4-element, 2-group (4-2) optical scheme delivers an exceptionally clean and sharp image across the entire 50° field of view, free from the annoying aberrations that are common in more complex modern designs.
Precise mechanical construction is complemented by modern HT-MC broadband multi-layer anti-reflection coatings, which minimize reflections and light loss. The result is an image with high contrast and accurate rendering of fine detail - whether on the surface of a planet or on the terrain of the Moon.
Who is this eyepiece for?
The Ortho Classic 10mm is a choice for observers who want maximum optical quality at high magnification. The 10mm focal length, combined with the focal length of your telescope, will deliver significant magnification - ideal for detailed study of planetary discs, the lunar surface or double stars.
The 10mm eye relief is acceptable for most observers. Users who wear glasses should take this parameter into account before purchasing.
The Baader Ortho Classic eyepiece will be especially appreciated by experienced astronomers who understand the value of optical simplicity and do not want to compromise on contrast or image sharpness.
Key features at a glance
- Classic orthoscopic design based on Carl Zeiss astronomical eyepieces
- 4-element, 2-group optical construction
- 50° apparent field of view
- 10mm focal length for high-magnification use
- 1.25″ barrel diameter
- 10mm eye relief
- HT-MC broadband multi-layer anti-reflection coatings
- Excellent contrast and sharpness - optimized for planets, the Moon and double stars
- Precise German mechanical construction
Technical specifications
| Parameter |
Value |
| Focal length |
10mm |
| Apparent field of view |
50° |
| Barrel diameter |
1.25″ |
| Eye relief |
10mm |
| Optical construction |
4 elements in 2 groups |
| Coatings |
HT-MC broadband multi-layer |
| Manufacturer |
Baader Planetarium (Germany) |
About Baader Planetarium
Baader Planetarium is a German manufacturer and supplier of astronomical optics with decades of experience. Their products are trusted by professional astronomers and demanding amateurs around the world. The brand's philosophy is built on precise German craftsmanship, scientifically grounded optical solutions and a strong focus on real-world usability at the eyepiece.
The Baader Ortho Classic orthoscopic eyepiece is not a trend product. It is a serious tool built on a scientific heritage - one that delivers exactly what matters most when you look through an eyepiece: a clean, sharp and high-contrast image.
