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If you have a Coronado SolarMax II Filter and you want to mount it to your telescope, you need one of these adapters. First select the size solar filter that you have; 40mm, 60mm, or 90mm. Measure the outside diameter of your OTA where a dew shield would attach. Then select the proper part number of the adapter.

The FSMF40-380 indicates that it is for the 40mm Coronado SolarMax II filter and the 380 refers to size of the adapter. This 380 adapter fits telescopes with dew shield diameter 2.7-3.7 inches.