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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 Adapter 4.1"i to M68i – for TEC 140-200 and 3.5" Feathertouch focuser
Baader Planetarium Adapter 4.1"i to M68i – for TEC 140-200 and 3.5" Feathertouch focuser
Baader Planetarium Adapter 4.1"i to M68i – for TEC 140-200 and 3.5" Feathertouch focuser
Baader Planetarium Adapter 4.1"i to M68i – for TEC 140-200 and 3.5" Feathertouch focuser
Baader Planetarium Adapter 4.1"i to M68i – for TEC 140-200 and 3.5" Feathertouch focuser
Baader Planetarium Adapter 4.1"i to M68i – for TEC 140-200 and 3.5" Feathertouch focuser
Baader Planetarium Adapter 4.1"i to M68i – for TEC 140-200 and 3.5" Feathertouch focuser

Baader Planetarium Adapter 4.1"i to M68i – for TEC 140-200 and 3.5" Feathertouch focuser

by Baader Planetarium
SKU BAA-2458191
$201.00 - $201.00
$201.00
$201.00 - $201.00
$201.00
Price Match Policy!
  • Connects 4.1" TEC and 3.5" Feathertouch focusers to the Baader M68 system
  • Creates a rigid, all-threaded connection for maximum stability
  • Engineered to eliminate sag and flexure with heavy imaging equipment
  • Provides the essential starting point for building an M68 optical train
  • Ideal for professional-level astrophotography and spectroscopy
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  • Description
  • FAQ
  • Specifications
  • In the Box
  • Warranty

  • Adapter 4.1"i to M68i – for TEC 140-200 and 3.5" Feathertouch focuser

    The Baader Adapter 4.1"i to M68i creates a zero-flexure, all-threaded connection from the large-format drawtubes of TEC 140-200 and 3.5" Feathertouch focusers directly to the Baader M68 system, securing heavy imaging trains for professional-level photography and spectroscopy.

    From 4.1" to M68i: A Zero-Flexure Connection for Heavy Imaging Trains

    For advanced imaging or spectroscopy, any amount of mechanical flexure in the optical train can render data unusable. Standard 2" compression clamps, even high-quality ones, can allow heavy or long accessories like telecentric systems or large cameras to tilt, destroying orthogonality. This adapter replaces that potential point of failure with a robust, large-diameter M68 threaded connection.

    By screwing directly onto the focuser's drawtube, this adapter ensures your entire imaging train—from the focuser to the camera sensor—is held in perfect alignment. This rigid foundation is the key to achieving sharp, consistent results, especially during long exposures or when using complex optical accessories.

    Native Fit for TEC 140-200 and 3.5" Feathertouch Focusers

    This adapter is precisely machined to integrate seamlessly with the 4.1" female thread found on TEC 140, 160, 180, and 200 telescopes, as well as the 3.5" Feathertouch series of focusers. It acts as the gateway to the entire Baader M68 system, a comprehensive ecosystem of extension tubes, adapters, and optical components like the M68 Tele-Compendium.

    If you own one of these premium instruments and intend to pursue serious imaging, this adapter is not an optional accessory but a fundamental component. It is the first and most critical link in building a professional-grade optical train that maintains collimation and alignment under load.

  • What is the main purpose of the Baader 4.1" to M68i adapter?

    Its primary purpose is to replace a standard slip-fit or compression-style connection with a rigid, secure M68 threaded connection. This eliminates mechanical flexure, which is critical for astrophotography and spectroscopy with heavy equipment on TEC 140-200 and 3.5" Feathertouch focusers.

    Why is a threaded connection better than my focuser's 2" clamp for my camera?

    A 2" clamp, even a good one, relies on friction and can allow a heavy camera or a long accessory (like a Barlow or telecentric system) to sag or tilt slightly due to leverage. A direct threaded connection like the one this Baader M68i adapter provides creates a solid, metal-on-metal coupling that physically cannot tilt, ensuring perfect alignment with the optical axis.

    Will this adapter work with my TEC 140 telescope for imaging planets with a telecentric system?

    Yes, absolutely. This is an ideal use case. A telecentric system can be long and heavy, making it prone to flexure in a standard clamp. This adapter provides the rigid M68 starting point you need to securely attach a telecentric system or other planetary imaging accessories for stable, high-resolution work.

    I have a 3.5" Feathertouch focuser. Can I use this adapter to attach Baader's M68 Tele-Compendium?

    Yes. This adapter is specifically designed to thread onto the 3.5" Feathertouch focuser, providing the male M68 thread required to begin building a system with the Baader M68 Tele-Compendium. It is the correct first piece for that integration.

    What problem does this Baader M68i adapter solve for spectroscopy?

    Spectrographs are highly sensitive to any shift in the light path. Even microscopic flexure can cause the target star to drift off the spectrograph's slit, ruining the data. This adapter provides the exceptionally stable mechanical connection required to keep the entire optical train fixed throughout a long data acquisition session.

    Is this adapter all I need to connect my camera to my TEC 140?

    No. This adapter is the foundational piece that connects your focuser to the Baader M68 system. You will need additional M68 extension tubes and adapters to achieve the correct spacing and final connection for your specific camera model.

  • Baader Planetarium Warranty