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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 Planetarium Baader 1.25" Extension Tube for Long Focal Length Eyepieces
Baader Planetarium Baader 1.25" Extension Tube for Long Focal Length Eyepieces
Baader Planetarium Baader 1.25" Extension Tube for Long Focal Length Eyepieces
Baader Planetarium Baader 1.25" Extension Tube for Long Focal Length Eyepieces
Baader Planetarium Baader 1.25" Extension Tube for Long Focal Length Eyepieces

Baader Planetarium Baader 1.25" Extension Tube for Long Focal Length Eyepieces

by Baader Planetarium
SKU BAA-2456325
$42.00 - $42.00
$42.00
$42.00 - $42.00
$42.00
Price Match Policy!
  • Enables Use of 30-42mm Eyepieces in Baader Maxbright Binoviewers
  • Solves Image Merging Failures with Long Focal Length Designs
  • Extends Eyepiece Barrel to Achieve Proper Focal Plane Alignment
  • Maintains Standard 1.25" Format for Eyepieces and Holders
  • Requires a Matched Pair (2 pieces) for Binocular Viewing
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  • Description
  • FAQ
  • Specifications
  • In the Box
  • Downloads
  • Warranty

  • Baader 1.25" Extension Tube for Long Focal Length Eyepieces

    This Baader 1.25" Extension Tube is the specific mechanical solution required to use long focal length eyepieces, particularly those in the 30mm to 42mm range, with a Baader Maxbright Binoviewer. A set of 2 tubes is mandatory—one for each optical path—to physically reposition the eyepieces outward, allowing your eyes to merge the two light paths into a single, cohesive image.

    Achieve Image Merge with 30-42mm Eyepieces

    Many classic long focal length eyepieces, such as 32mm or 40mm Plössls, have a focal plane located deep within their barrel. When used in a binoviewer, the body of the binoviewer can prevent these eyepieces from seating deep enough to reach focus, resulting in an inability to merge the two images. These 1.25" extension tubes act as simple spacers, moving the eyepieces slightly out from the binoviewer's holders. This adjustment correctly aligns each eyepiece's focal plane with the binoviewer's optical path, solving the merging problem and enabling comfortable, immersive views.

  • Why do I need the Baader 1.25" Extension Tube for my Maxbright binoviewer?

    You need a pair of these tubes if you use long focal length eyepieces (typically 30mm to 42mm) that cannot achieve a merged image. Their physical design prevents them from seating deep enough in the binoviewer to align with the optical path. These extensions provide the necessary spacing to correct this and allow for a single, merged view.

    Can I use just one Baader 1.25" Extension Tube?

    No. For binoviewing, you must use two identical optical trains. You will need a matched pair of these extension tubes, one for each eyepiece, to ensure that both eyes are viewing through an identical setup, which is critical for image merging and avoiding eye strain.

    Will this extension tube work with eyepieces shorter than 30mm?

    These tubes are generally not necessary for eyepieces with focal lengths shorter than 30mm. Most shorter focal length eyepieces do not have the same deep-set focal plane and will reach focus in the Maxbright binoviewer without any adapters.

    Does the Baader 1.25" Extension Tube add any optical elements or affect image quality?

    No, this is a purely mechanical adapter. It is a hollow tube that contains no lenses or glass. It simply changes the physical position of your eyepiece and does not alter the optical properties or introduce any degradation to the image quality.

    I have a pair of 32mm Plössls for my Maxbright II binoviewer; will these tubes help me merge the image in my 8" SCT?

    Yes, this is the exact scenario these tubes are designed for. A pair of 32mm Plössls is a classic example of an eyepiece that struggles to merge in a binoviewer. Using a pair of these 1.25" extension tubes will provide the correct spacing to achieve a clean, merged image in your SCT setup.

    Will the Baader 1.25" Extension Tube work with other binoviewers?

    While designed specifically for the Baader Maxbright series, this 1.25" extension tube may work with other binoviewers that exhibit the same issue with long focal length eyepieces. However, compatibility is not guaranteed, as the required spacing can vary between different binoviewer models.

  • Net weight (kg) 0.05
    Compatible Brands UNC, Baader Planetarium, Celestron
    Inner Diameter / Clear Aperture (mm) 28
    Outer Diameter 45
    Type of Adapter Extension, Filter holder
    Optical length (mm) 8
    Inner Connection (eyepiece/-camera-sided) ø 1¼" (31.75 mm)
    Inner Connection (lens sided) M28.5
    Outer Connection (lens sided) ø 1¼" (31.75 mm)
    Adaptable to Baader Maxbright
  • Baader Planetarium Warranty