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I used to own the DGM O-III and tested it against the Orion Ultrablock which is a Narrowband filter. Both worked almost exactly the same in the bandpass dept, but the Orion gave a "green" hue, while the DGM O-III gave a more "natural looking" view.
Tha bandpass on the Omega O-III is too wide to be considered a "true" O-III filter.
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