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Coronado SolarMax II 40mm Solar Filter Set

B&H # COS240BF5 Mfr # SMF40-5
Usually ships in 7-14 business days

Availability Details


This is a special order item. Est. arrival at B&H is 7-14 business days (subject to availability). Your order will be charged at the 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: $899.00
Product Highlights
  • BF-5 90° Blocking Filter
  • Compatible w/ 500mm Focal Length Scope
  • RichView Tuning
  • Double Stack Etalon Filter
  • Upgrades a <0.5 to a <0.7 Å System

This SolarMax II 40 H-Alpha Solar Viewing Filter Kit is comprised of a 40mm aperture narrowband H-a filter with the TMax tuner, and a BF-5 blocking filter. It is maximized for telescopes equal to or shorter than a 500mm focal length. The filter increases the bandwidth from <0.5 to <0.7 â¿« providing greater detail and sharpness of the solar features.

SolarMax II H-Alpha filters allow viewing of the active surface of the sun with 100% safety. None of the parts of this kit are stand-alone units - each component is equally crucial to the user's safety and the system's performance.

The SolarMax II 40 filter comes with the T-Max 40 Doppler Tuning Unit. The T-Max is used to de-tune the telescope's optical system. The wavelengths produced by high-velocity events such as active flares and coronal mass ejections (CME) can Doppler-shift and become invisible to an H-Alpha tuned system. The T-Max unit allows the user to de-tune the SolarMax filter slightly to make these phenomena more visible.

A Rear-Blocking Filter is also included in this kit, and it is designed for use with telescopes that have a focal length equal to or shorter than 500mm. The BF-5 is a 1.25" right-angle diagonal, and it must be used in conjunction with the SolarMax filters.

SolarMax II 40 H-Alpha Filter
Converts telescopes with a focal length equal to or shorter than 500 mm into a <0.7 Å solar viewing system
T-Max 40 Doppler Tuning Unit
Attached directly behind the etalon, the tuner adjusts to compensate for Doppler shifted light. By de-tuning the SolarMax filter towards the blue end of the H-Alpha line, the T-Max 40 facilitates enhanced observation and imaging of solar disk shapes, surface details, prominences, granulation, and edge activities
BF-5 Blocking Filter
Designed for use with telescopes that have a focal length equal to or shorter than 500 mm, the BF-5 is a 1.25" right angle diagonal that must be used with a SolarMax filter
Coronado SolarMax II 40mm Solar Filter Set
  • BF-5 Blocking Filter
  • SolarMax II 40mm Double Stacking Filter
  • Cleaning & Anti-Fog

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    General Brand -  Lens Cleaning Kit
    • You Pay: $4.95
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