Skip to content
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 Eyepiece Projection Adapter (I-VII)
Baader Eyepiece Projection Adapter (I-VII)
Baader Eyepiece Projection Adapter (I-VII)
Baader Eyepiece Projection Adapter (I-VII)
Baader Eyepiece Projection Adapter (I-VII)
Baader Eyepiece Projection Adapter (I-VII)
Baader Eyepiece Projection Adapter (I-VII)
Baader Eyepiece Projection Adapter (I-VII)
Baader Eyepiece Projection Adapter (I-VII)
Baader Eyepiece Projection Adapter (I-VII)
Baader Eyepiece Projection Adapter (I-VII)
Baader Eyepiece Projection Adapter (I-VII)
Baader Eyepiece Projection Adapter (I-VII)
Baader Eyepiece Projection Adapter (I-VII)
Baader Eyepiece Projection Adapter (I-VII)
Baader Eyepiece Projection Adapter (I-VII)

Baader Eyepiece Projection Adapter (I-VII)

by Baader Planetarium
SKU BAA-2458141
$62.00 - $91.00
$78.00
$62.00 - $91.00
$78.00
Price Match Policy!
  • Enables high-magnification eyepiece projection photography
  • Accepts standard 1.25" eyepieces with up to a 38mm outer diameter
  • Includes two 40mm T-2 extension tubes for adjusting image scale
  • Features a sliding focuser for fine distance adjustments
  • Available in 7 versions to fit nearly any telescope focuser
Backordered
Request Stock Alert
Availability Info
Qualifies for FREE Shipping in CONUS on orders over $350.
  • Description
  • FAQ
  • Specifications
  • In the Box
  • Downloads
  • Warranty

  • Baader Eyepiece Projection Adapter (OPFA I-VII)

    The Baader Eyepiece Projection Adapter (OPFA) provides a rigid, fully-featured system for capturing high-magnification solar, lunar, and planetary images. This adapter securely holds any 1.25" eyepiece with an outer diameter up to 38mm, projecting a magnified image onto your camera sensor. The assembly includes two 40mm T-2 extension tubes to create a stable, light-proof barrel, and is offered in seven distinct models (I-VII) to ensure a direct connection to virtually any 1.25", 2", SCT, or European-threaded focuser.

    Planetary Imaging with 1.25" Eyepieces and Two 40mm Extensions

    Eyepiece projection is the classic technique for reaching the extreme equivalent focal lengths needed to resolve fine details on Jupiter's cloud bands or within Saturn's rings. The Baader OPFA is a complete system designed to make this process stable and repeatable. By inserting a 1.25" eyepiece into the adapter's helical-style clamp, you can project a highly magnified view through the included 40mm T-2 extension tubes and onto your camera sensor, which connects via a standard T-2 ring (sold separately).

    The final image scale is a function of both the eyepiece focal length and the projection distance. You can easily increase magnification by adding more T-2 extension tubes to the system, creating a rock-solid, all-threaded connection that eliminates the flexure and wobble common in simpler, set-screw-based projection tubes.

    A Modular System with Sliding Focus and 360° Rotation

    The OPFA is engineered for precise control over focus and framing. Its integrated sliding focuser allows you to make fine adjustments to the projection distance by moving the eyepiece forward or back within its holder. This provides a secondary level of focus control and directly alters the final image magnification without changing extensions.

    For precise composition, a T-2 counter-ring lets you rotate the entire camera assembly a full 360° and lock it at the perfect orientation. This is essential for framing lunar features or aligning planetary moons. For the slip-fit 1.25" (OPFA-I) and 2" (OPFA-II) models, rotation can also be done at the focuser, but for the direct-threaded models (III-VII), this T-2 ring provides the only mechanism for camera rotation.

    7 Telescope-Side Adapters for Universal Connection

    To ensure a secure, direct fit to your specific telescope, the Baader OPFA is available in seven different configurations. Each model shares the same core projection system but includes a different telescope-side adapter. This eliminates the need for stacking multiple generic adapters, which can introduce tilt and instability into the imaging train.

    • OPFA I & II: For standard 1.25" and 2" slip-fit focusers.
    • OPFA III: Provides a direct-threaded connection to the 2" SCT thread on Celestron and Meade Schmidt-Cassegrains.
    • OPFA IV: The base version, offering a female T-2 thread for custom connections within the Baader Astro T-2 System.
    • OPFA V, VI, & VII: Threaded adapters for specific European and Japanese telescopes, including M44 Zeiss, M43 Vixen/Takahashi, and M36.4 Vixen/Takahashi/Lichtenknecker standards.

  • What else do I need to use the Baader Eyepiece Projection Adapter?

    To use the Baader OPFA, you will need three additional items: a 1.25" eyepiece (max 38mm outer diameter), a T-2 Ring specific to your camera's bayonet mount (e.g., Canon EOS, Nikon F), and your camera body (DSLR or dedicated astronomy camera).

    How do I increase the magnification with the Baader OPFA?

    You can increase the final image scale in two ways. First, by using a shorter focal length eyepiece (e.g., a 10mm eyepiece produces more magnification than a 25mm). Second, by increasing the projection distance between the eyepiece and the camera sensor by adding more T-2 extension tubes to the two included 40mm extensions.

    What is the maximum size eyepiece the Baader OPFA can hold?

    The Baader OPFA is designed for standard 1.25" barrel eyepieces. The physical outer diameter of the eyepiece body cannot exceed 38mm to fit inside the T-2 extension tubes.

    How does the Baader OPFA help frame the Moon's Straight Wall (Rupes Recta)?

    To perfectly frame a linear feature like Rupes Recta, you can loosen the T-2 counter-ring on the sliding focuser. This allows you to rotate your attached camera a full 360° without loosening the adapter from the telescope. Once the feature is aligned with your camera's sensor, you simply tighten the ring to lock it in place.

    Which Baader OPFA model do I need for my Celestron 8" SCT?

    For a standard Celestron or Meade Schmidt-Cassegrain Telescope with a 2" visual back, you should select the OPFA-III. This model includes an adapter that threads directly onto the telescope's rear cell SCT thread, providing the most rigid and secure connection possible.

    Can I use the Baader OPFA for prime focus photography without an eyepiece?

    Yes. The components can be reconfigured for prime focus imaging. By connecting the telescope-side adapter directly to the T-2 extension tubes and your camera's T-2 ring (omitting the eyepiece holder), the Baader OPFA functions as a high-quality, variable-length T-2 extension tube set for achieving focus with certain cameras.

  • Adapter System Eyepiece Projection (OPFA) and Prime Focus
    Eyepiece Compatibility 1.25" barrels, max 38mm outer body diameter
    Camera Connection T-2 (M42x0.75) Male Thread
    Included Extensions 2x 40mm T-2 Extension Tubes
    Focus/Framing Sliding focuser for distance adjustment, 360° rotation ring
    Model I Connection 1.25" Push-fit Barrel
    Model II Connection 2" Push-fit Barrel
    Model III Connection 2" Female SCT Thread (for Celestron/Meade)
    Model IV Connection Female T-2 (M42x0.75) Thread
    Model V Connection Female M44 Zeiss Thread
    Model VI Connection Female M43 Vixen/Takahashi Thread
    Model VII Connection Female M36.4 Vixen/Takahashi/Lichtenknecker Thread
    Net weight (kg) 0.17 (I: 1.25" Barrel, V: M44 Zeiss Thread)
    0.20 (II: 2" Barrel)
    0.18 (III: 2" SCT Thread)
    0.15 (IV: Base Version (T-2 Inner Thread))
    0.16 (VI: M43 Vixen Thread, VII: M36.4 Vixen/TAK/Lichtenknecker Thread)
    Outer Diameter 55.0 (I: 1.25" Barrel)
    60.0 (II: 2" Barrel, III: 2" SCT Thread, IV: Base Version (T-2 Inner Thread), V: M44 Zeiss Thread, VI: M43 Vixen Thread, VII: M36.4 Vixen/TAK/Lichtenknecker Thread)
    Type of Adapter Extension, Variable Focusing
    Optical length (mm) variabel
    Inner Connection (lens sided) M28.5, M34, M42 x 0.75 (T-2) (I: 1.25" Barrel)
    M34, M42 x 0.75 (T-2), M48 (II: 2" Barrel)
    M34, M42 x 0.75 (T-2), 2"/SCT Thread (50.8mm) (III: 2" SCT Thread)
    M34, M42 x 0.75 (T-2) (IV: Base Version (T-2 Inner Thread), V: M44 Zeiss Thread, VI: M43 Vixen Thread, VII: M36.4 Vixen/TAK/Lichtenknecker Thread)
    Outer Connection (lens sided) ø 1¼" (31.75 mm) (I: 1.25" Barrel)
    ø 2" (50.8mm) (II: 2" Barrel)
    M44 (V: M44 Zeiss Thread)
    M43 (VI: M43 Vixen Thread)
    M36.4 (VII: M36.4 Vixen/TAK/Lichtenknecker Thread)
  • Baader Planetarium Warranty