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Believe the Baader fast filters are designed with the Rasa in mind, and it's where i would head if & when i go the 11" f2 route, just need the mount for it.
Also, some people have success using the Rasa 11 with the mini zwo efw, so you won't have to manually change the filters which i could only guess would become a chore after a while, especially if you also have a dew shield in the way. The mini doesn't have a very large foot print either so whilst it does block some of the light & introduce a slight change to diffraction shape, its not a deal breaker. Pros & cons.
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