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Fitting Chroma 3nm narrowband filters into Atik EFW2

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I am replacing two Baader 7nm filters with two Chroma 3nm narrowband filters, 36mm unmounted into an Atik EFW2.  Have replaced one but am not sure I've done it correctly so before I fit the second one would appreciate some help.  It's a different design from the Baader - deeper  and I haven't managed to get it to fit as flush as the Baader ones?  The Baader filters are mounted on a rubber ring and screws with little white spacers are used to secure the filters so  they are flush.  I've assumed I should do the same with the Chroma filters though the rubber ring is very fiddly to fit - I've just dropped it in until it looked ok and then dropped (gently!!) the filter on top ?   It's all a bit nerve racking thinking about how much I've paid for the filters!!


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