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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.
Baader UFC S70 Extension - 15mm
Baader UFC S70 Extension - 15mm

Baader UFC S70 Extension - 15mm

by Baader Planetarium
SKU BAA-2459142
$57.00 - $57.00
$57.00
$57.00 - $57.00
$57.00
Price Match Policy!
  • Adds a precise 15mm of optical path length
  • Connects via the Baader S70 dovetail system
  • Ensures a rigid, tilt-free connection
  • Part of the modular Universal Filter Changer (UFC) system
  • Includes mounting screws
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  • Description
  • FAQ
  • Specifications
  • In the Box
  • Downloads
  • Warranty

  • Baader UFC S70 Extension - 15mm

    The Baader UFC S70 Extension adds a precise 15mm of optical path length to any imaging train built around Baader's Universal Filter Changer system. It connects securely via the large-format S70 dovetail standard, ensuring a rigid, non-flexing mechanical joint between other UFC components.

    Adding a Fixed 15mm to Your Baader UFC Imaging Train

    When your back focus calculation requires a fixed 15mm of additional space, this UFC extension provides a simple, rock-solid solution. Unlike variable spacers that can introduce play or tilt, this single-piece extension maintains perfect optical alignment, which is critical for achieving sharp stars across a flat field, especially when using a sensitive camera with a corrector or reducer.

    The extension features the Baader S70 dovetail on one side and an S70 dovetail clamp on the other, allowing it to integrate seamlessly anywhere in the UFC chain. This robust connection method prevents the flexure that can plague threaded adapters, particularly under the load of a heavy camera and filter wheel. All necessary mounting screws are included for immediate use.

  • What is the primary use for the Baader UFC S70 15mm Extension?

    The primary use is to add exactly 15mm of spacing within a Baader UFC optical train. This is done to achieve the precise back focus distance required by a specific field flattener, reducer, or corrector to ensure optimal imaging performance.

    How does the Baader UFC S70 15mm Extension connect to other UFC parts?

    It uses the Baader S70 dovetail system on both sides. This large-format dovetail provides a secure, rigid connection that is locked in place with the included screws, preventing both rotation and tilt far more effectively than standard threaded connections.

    When would I choose the Baader UFC 15mm Extension over a variable extension tube?

    You should choose this fixed 15mm extension when you need that exact spacing and prioritize mechanical rigidity above all else. A fixed extension introduces zero play or tilt, which can be a problem with some variable or helical extension designs, especially when supporting a heavy imaging payload.

    Can I stack multiple Baader UFC 15mm Extensions?

    Yes, the S70 dovetail system allows UFC components to be stacked. For example, two 15mm extensions would provide 30mm of spacing. However, for longer distances, using a single, longer UFC extension is generally recommended to minimize the number of mechanical joints in the system.

    My reducer needs 55mm of back focus and my camera plus UFC base is at 40mm. Is the Baader UFC 15mm Extension the right part?

    Yes, this is the perfect application. The 15mm extension will fill the 15mm gap (55mm - 40mm) precisely, allowing you to achieve the optimal back focus for your reducer and ensure sharp stars from edge to edge.

    Will the Baader UFC S70 15mm Extension cause vignetting with my full-frame camera?

    The Baader S70 system is a large-format standard specifically designed to minimize vignetting, even with full-frame (35mm) sensors. The 15mm extension maintains this large internal clear aperture, so it should not introduce any new vignetting into a properly configured S70 imaging train.

  • Extension Length 15mm
    Mechanical Interface Baader S70 Dovetail / S70 Dovetail Clamp
    Series Baader UFC (Universal Filter Changer)
    Net weight (kg) 0.07
    Inner Diameter / Clear Aperture (mm) 65 mm
    Outer Diameter 79.8 mm

    • Baader UFC S70 Extension - 15mm

      × 1

    • Mounting Screws

      × 1 Set

  • Baader Planetarium Warranty