Used ZWO 2" Blue Imaging Filter


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  • $49.95
  • Regular price $69.95

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This 2'' blue filter was part of a set of 4 2'' ZWO LRGB filters, which we are selling individually.  It is in excellent condition, with clean glass and coatings.  Comes in its original jewel case.   



ZWO's 2" filter design boasts excellent 92% transmission at passband, great optical coatings, and good color separation.

The LRGB filters have a mechanical thickness of 5mm, with an additional 2.5mm added for the thread. The optical thickness measures in at 1.85mm. Each filter is more parfocal with a thickness of 1.9+/-0.03 mm. As for the thread, this filter comes with a M48x0.75 thread.

Each filter is fine-optically polished to reach an accuracy of 1/4 wave and is equipped with anti-reflection coatings.  Additionally, the ZWO LRGB filters have precision off-brand blocking.


Product specification
SKU Number
Model Number
Single Filter, Set, or Accessory
Filter Set
Filter Type
RGB Sets
Filter Size
50.8mm (2")
Filter Shape
Filter Insert Style
Filter Optical Thickness
1.85 mm
Filter Mechanical Thickness
7.5 mm