0ur opinion:

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This Nebula Filter is similar to the filters presently available. The effects of light pollution will be greatly reduced, improving contrast and visibility of emission nebula. Stellar objects will lose a great deal of intensity as a result. These filters lie between the narrowband 0-lll and the more common nebula filter in bandwidth. This compromise should fulfill the needs of the majority of users. As with the other Sirius 0ptics interference filters, these are not protected by a second layer of glass. When attached to an eyepiece, the coating will face the eyepiece and therefore be protected from the elements. lt is recommended to keep the filter attached to the eyepiece when coming in from the cold night to prevent moisture from forming.

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