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ITF Replacement Filter for Coronado BF


The Beloptik ITF replacement filter for Coronado H-alpha blocking filter systems is a hard coated filter and solve the „rust problem“ of the original ITF in the PST, BF5, BF10, BF15 and BF30. The silver layer in the original can be oxidized after 3...5 sometimes after 10 years using depend due the factory sealing.
This new filter is durable, has no aging and will place direct as drop-in in the holder instead of the original one.

Please note, this is not the 6A sub-nanometer H-alpha filter from eyepiece site of the BF. Safe use is only garanted complete in configuartion with both filters, the ITF in telescope site barrel and the 6A H-alpha blocker in the eyepiece barrel.


  • Dia 17.7mm (PST, BF5, BF10, BF15) for 169 EUR add. shipping (stock 0 pcs)
  • Dia 35mm (BF30) for 289 EUR add. shipping (stock 1 pcs)

Renovation Coronado CaK 393nm filter module

The discontinued Coronado Calcium-K telescope have a 393nm Ca-K filter module which may also contain an oxidized or tarnished ITF filter. These Ca-K systems can also be repaired.