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As has been mentioned, doing planetary work does not require a field flattener, the newt/dob version of this is a coma corrector. I imagine that the chromatic aberration that you're experiencing is being caused by the Bintel Barlow.
Although it is probably as expensive as your scope, the TeleVue Powermates are fantastic and you can get an adapter so attach your SLR onto the back of it.
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