Question about Coronado SolarMax 40 Telescope

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40mm Solarmax Filter

I have an original Coronado 40mm Solarmax filter set. I don't know the BF size. Based on the price I paid, it sounds like a 5mm. When I ordered I told them It would be used on a Celestron C5. How can I determine the BF size?

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Measure the aperture of the output (eyepiece end) of the blocking filter. That diameter in mm determines the BF size.

That is not the only difference among all the bloacking filters but is the way to determine which one you have.

Regards, Marc

Posted on Dec 05, 2008


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