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IMPORTANT: Our store is located in Canada. All orders that include products manufactured outside of Canada or USA will be subject to tariffs and duties, regardless of the order value. US customers are responsible for all applicable duties and tariffs, and those will be billed by the carrier, except for the Lacerta upgrade kit, for which we collect them at checkout.
IMPORTANT: Our store is located in Canada. All orders that include products manufactured outside of Canada or USA will be subject to tariffs and duties, regardless of the order value. US customers are responsible for all applicable duties and tariffs, and those will be billed by the carrier, except for the Lacerta upgrade kit, for which we collect them at checkout.
Baader Classic Ortho 10mm Eyepiece - 1.25"
Baader Classic Ortho 10mm Eyepiece - 1.25"
Baader Classic Ortho 10mm Eyepiece - 1.25"

Baader Classic Ortho 10mm Eyepiece - 1.25"

by Baader Planetarium
SKU BAA-2954110
$108.00 - $108.00
$108.00
$108.00 - $108.00
$108.00
Price Match Policy!
  • 10mm Focal Length
  • 50° Apparent Field of View
  • Classic 4-Element Orthoscopic Design
  • HT Multi-Coated Optics
  • Safe for Solar Projection
  • 1.25" Barrel
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  • Description
  • FAQ
  • Specifications
  • In the Box
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  • Warranty

  • Baader Classic Ortho 10mm Eyepiece - 1.25"

    The Baader Classic Ortho 10mm Eyepiece delivers a tack-sharp 50° apparent field of view in a true 1.25" orthoscopic design, purpose-built for high-magnification planetary and solar observing. Its optical path, featuring only four glass-air-surfaces with Baader's HT multi-coatings, maximizes light transmission and contrast to a level where the lenses seem to disappear, revealing the finest details on high-contrast targets.

    The 50° Orthoscopic View: 4-Element High-Contrast Design

    Following the legendary optical design of Zeiss Jena orthoscopics, this eyepiece provides a distortion-free, high-contrast image that excels on planets, the Moon, and double stars. The 4-element design, combined with blackened lens edges and meticulously baffled interiors, virtually eliminates internal reflections and stray light for a dark, clean background field.

    The result is an exceptionally high level of light transmission and on-axis sharpness. The 50° apparent field is framed by a razor-sharp field stop, creating a clean, immersive window that renders planetary details with stunning clarity and color fidelity.

    Solar Projection Safe: Heat-Resistant Cement Tested for 6+ Hours

    Unlike modern eyepieces that use UV-cured cement which can fail under thermal stress, the Baader Classic Ortho is constructed with heat-resistant cement. This critical feature makes it one of the few eyepieces on the market genuinely safe for solar projection. Baader has tested the design for over six continuous hours on 150mm refractors without any damage to the optics.

    The all-metal housing and dual internal field stops are engineered to manage heat effectively during prolonged solar viewing sessions. While the internal black anodization may fade slightly if the sun drifts off-center, the optical integrity remains uncompromised, reviving a classic and safe method of solar observation.

    Projection & Binoviewer Ready: A Sub-35mm Diameter Body

    With a lean housing diameter of less than 35mm, the Classic Ortho is an ideal choice for a range of advanced applications. Its slim profile allows two eyepieces to be used side-by-side in any binoviewer without interference, providing comfortable stereo views of the Moon and planets.

    This eyepiece is also a powerful tool for high-magnification imaging. It is perfectly suited for classic eyepiece projection using adapters like the Baader OPFA system, allowing you to achieve the large image scale necessary for capturing fine details on planetary surfaces. The excellent optical correction ensures your camera captures a sharp, high-fidelity image.

    A 4-Element Design Outperforming Eyepieces 5x the Cost

    In side-by-side comparisons on an optical bench, the Baader Classic Ortho demonstrates performance on par with so-called "planetary eyepieces" costing five times as much. The simple, highly-corrected 4-element design prioritizes on-axis sharpness and light throughput over extreme field width, achieving a level of contrast that more complex designs often sacrifice.

    For the dedicated planetary, lunar, or solar observer, this eyepiece represents exceptional value. It delivers the core optical excellence required for critical observation without the premium price tag, proving that a classic, well-executed design remains a top performer.

  • What makes the Baader Classic Ortho 10mm ideal for planetary viewing?

    The Baader Classic Ortho 10mm uses a true orthoscopic design renowned for its high on-axis sharpness, excellent contrast, and high light transmission. With only four glass-air surfaces and HT multi-coatings, it minimizes internal reflections, producing a clean, bright image essential for resolving subtle details in planetary atmospheres and on lunar surfaces.

    Is the Baader Classic Ortho 10mm eyepiece actually safe for solar projection?

    Yes. Unlike most modern eyepieces, the Classic Ortho is built with heat-resistant cement and an all-metal body. Baader has tested it for over six hours of continuous solar projection with a 150mm refractor without damage. This makes it one of the few eyepieces specifically and safely designed for this application.

    Will the Baader Classic Ortho 10mm fit in my binoviewer?

    Yes. The eyepiece features a slim housing with a diameter of less than 35mm. This narrow profile ensures that two Classic Ortho eyepieces can easily fit side-by-side in any standard binoviewer without their housings touching, allowing for comfortable interpupillary distance adjustment.

    How does the Baader Classic Ortho 10mm compare to more expensive planetary eyepieces?

    According to Baader's optical bench tests, the Classic Ortho performs on par with specialized planetary eyepieces that cost up to five times more. It prioritizes fundamental optical quality—sharpness, contrast, and transmission—over wider fields, delivering premium performance for critical high-magnification viewing at an accessible price.

    How will the Baader Classic Ortho 10mm perform on Jupiter with my 8" f/10 SCT?

    In an 8" f/10 SCT (2032mm focal length), the 10mm Classic Ortho will provide 203x magnification, an excellent power for observing Jupiter. This magnification is high enough to clearly resolve the primary cloud bands, the Great Red Spot (GRS), and shadow transits of the Galilean moons, while the eyepiece's high contrast will make these features stand out sharply.

    Can I use the Baader Classic Ortho 10mm for eyepiece projection to image Saturn's rings?

    Absolutely. The Classic Ortho is an excellent choice for eyepiece projection, especially for a target like Saturn. Its high on-axis sharpness ensures a crisp projected image, allowing your camera to capture details like the Cassini Division in the rings. Its slim body fits easily into projection adapters like the Baader OPFA.

  • Focal Length 10mm
    Barrel Size 1.25"
    Apparent Field of View 50°
    Optical Design Classic Orthoscopic (4-Elements)
    Coatings HT (High-Transmission) Multi-Coated
    Special Feature Safe for Solar Projection (Heat-Resistant Cement)
    Housing Diameter Less than 35mm
    Filter Threads Standard 1.25"
    Net weight (kg) 0.05
    Eye Relief (mm) 8 mm
    Field Stop Diameter 8.7 mm
    Parfocal Eyepieces Yes
    AR-Coating High transmission multi-coated (HT-MC)
    Optional Accessories Q-Turret Eyepiece Revolver
    Speciality No Speciality (standard eyepiece)
    Threaded for filters No
    Field Stop Displacement to reference plane -2 mm
    Number of Groups 2
    Dustcaps 1¼" dustcap (31.8mm)
    Eyecups winged eyecup (1¼")
    Slip Protect Safety Classic Undercut
    Eyepiece Body above Reference Plane (mm) 17.12 mm
    Length of 1¼" barrel (mm) 24 mm
    Eyepiece Series Classic (Q-Turret)
    Outer Diameter 34.8 mm

    • Baader Classic Ortho 10mm Eyepiece

      × 1

    • Winged Eyecup

      × 1

    • Dust Covers

      × 2

  • Baader Planetarium Warranty