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The T-adapter supports two length configurations: one designed for the standard 133.35mm backfocus of f/10 systems, and a shorter version suited for the 105mm backfocus required by the Celestron f/7 focal reducer.
CCD cameras can also be used by adding T-thread spacers to match the backfocus difference between a DSLR and CCD. For assistance in selecting the correct spacers, contact Starizona.
In either configuration, the adapter provides 55mm of remaining backfocus—ideal for incorporating an OAG, filter wheel, or standard accessories.