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Lunt Blue Glass 20mm for B400 to B1800 Blocking Filters

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Lunt Blue Glass 20mm for B400 to B1800 Blocking Filters

  • Spare part, not usable separately
  • Only for blocking-filters from Lunt Solar Systems
  • Only for B400, B500, B600, B1200 and B1800
  • Not suitable for B3400

​Spare part for blocking-filters from LUNT SOLAR SYSTEMS, suitable for B400, B500, B600, B1200 and B1800 blocking-filters.

The H-alpha telescopes and filter systems from Lunt Solar Systems each include a blocking-filter. The blocking-filters have a blue coloured filter part on the side facing the telescope. This blue coloured filter parts may become a milky white layer at older blocking-filters if the blocking-filter was stored at high air humidity for some time. Please always store H-alpha telescopes and filters as dry as possible. If this blue coloured filter part has become a milky white layer, it can be replaced with this spare part. The replacement is easy and can be done by the user himself. Installation instructions can be found here under the "Manuals" tab as a PDF for download.

Please note that this replacement part can only be used on Lunt Solar Systems blocking-filters B400 to B1800. If the problem happens with the large B3400 blocking-filter, the B3400 must be sent to our service department for repair.


Specifications: Lunt Blue Glass 20mm for B400 to B1800 Blocking Filters

  • Diameter: 20mm
  • Cannot be used separately, only as spare part at blocking-filters from Lunt Solar Systems
  • For B400, B500, B600, B1200 and B1800 blocking-filters
  • It does not matter if the blocking-filters are installed in 90° zenith-mirrors or straight extension-tubes

What's in the Box

What's in the Box: Lunt Blue Glass 20mm for B400 to B1800 Blocking Filters

  • Spare part: 20mm blue glass for Lunt B400 to B1800 blocking-filters
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