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I use a FLI 2-7 FW with my QHY9 but my FF is ideal at 105 - 110mm. Your FF/FR sounds like it was made for a DSLR rather then CCD camera. The FLI unit is very heavy but allows seven 2 inch filters to be used and is absolutely spot on in pecision as well as being extremely fast. They are not cheap.
Mark
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