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Hi Gary,
The TeleVue 0.8x Reducer/Flattener RFL-4087 is suited for focal length 800-1000mm and it delivers a nice flat field up to a 35mm frame, so it should be perfect for your telescope and camera set-up. The WO reducer is quite ok for shorter focal lengths but I doubt it work for 900mm. From what I remember the Celestron 6.3 is only sort of working for webcams.
Stephan
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