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LUNT B3400 Blocking-Filter in 2" extension tube

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LUNT B3400 Blocking-Filter in 2" extension tube

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3'412.00 CHF tax incl.

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LUNT B3400 Blocking-Filter in 2" extension tube

Blocking-filter in straight extension tube, for telescopes up to 3060mm focal length. Can only be used together with a LUNT H-alpha filter, or with a LUNT H-alpha telescope!

Lunt Solar Systems offers blocking-filters in different sizes, and alternatively in 90° star-diagonal housings or straight extension tubes. You can choose what blocking-filter you will use at your LUNT H-alpha Etalon system.

The B3400 is installed in a straight extension tube, for 2" focuser on the telescope side, and with 2" eyepiece connection and 1.25" adapter on the eyepiece side. The B3400 can be used at LUNT H-alpha systems, if the used telescope has up to 3060mm focal length.

The blocking-filter can not be used without additional H-alpha filter system from Lunt Solar Systems! Blocking-filters are absolutely required for the safety and performance of H-alpha telescopes for solar observing. Lunt Solar Systems blocking-filters contain a unique filter system. We can only warranty safety or performance, if blocking-filter is paired with a H-alpha filter or H-alpha telescope of Lunt Solar Systems.


  • Blocking-filter only usable at additional H-alpha filter system
  • Filter diameter: 34mm
  • Usable at telescopes up to 3060mm focal
  • In straight extension tube
  • For 2" focuser
  • Connection for 2" eyepieces
  • Adapter for 1.25" eyepieces


  • Blocking-filter B3400 in 2" straight extension tube
  • Adapter for 1.25" eyepieces