What item is right for you?
Ask our Experts! 800.606.6969 Live Chat

Coronado Blocking Filter BF-30

B&H # COBF30 Mfr # BF30
Usually ships in 7-14 business days

Availability Details


This is a special order item and is non-cancelable and non-returnable. Est. arrival at B&H is 7-14 business days (subject to availability). Your order will be charged at time of shipment.

International Orders*
For international orders, credit cards will be charged at time you place your order.

Free Standard Shipping
Not eligible for free Expedited Shipping
You Pay: $1,584.95
Product Highlights
  • 30mm
  • 2.0" Straight-Through Design
  • 1.25" Zero-Length Reducer Included
  • For Telescopes ≤3000mm
  • Needs a SolarMax Solar Viewing Filter
  • Made in the USA

The BF-30 Blocking Filter from Coronado is the secondary interference filter in a Coronado H-Alpha solar viewing system. Blocking filters are not stand-alone devices; they must be used in conjunction with a SolarMax filter. In a solar viewing system, the blocking filter is just as crucial to the viewer's safety and the system's performance as the front element.

This 30mm blocking filter, the BF-30, is compatible with telescopes that have a focal length that is equal to or less than 3000mm. It features a 2.0" straight-through design, and a 1.25" zero-length reducer is included.

Note! SolarMax filters are sold in kits that include a blocking filter. This blocking filter offered here is intended for viewers who have two different focal length telescopes that they intend to use with their SolarMax system.

Must be used with a SolarMax filter
Image size: 27.2 mm
2.0" straight-through design
1.25" zero-length reducer included
For telescopes with a focal length equal to or less than 3000 mm
Coronado Blocking Filter BF-30
  • Zero Length Adapter
  • Limited 5 Year Warranty
  • Cleaning & Anti-Fog

    Show more >
    Pearstone -  Microfiber Cleaning Cloth, 18% Gray (7 x 7.9")
    • You Pay: $4.99

    Eyepieces, Lenses & Diagonals

    Show more >
    Coronado -  CEMAX 12mm Eyepiece
    • You Pay: $73.71

    Barlow Lenses

    Coronado -  CEMAX 2x Barlow Lens
    • You Pay: $79.99
    See any errors on this page? Let us know.