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35.3mm T-to-T spacer. Makes the backfocus 55mm to work with many common setups such as DSLRs with T-rings or ZWO cooled cameras with standard ZWO spacers or OAG/EFW.
35.3mm T-to-T spacer. Makes the backfocus 55mm to work with many common setups such as DSLRs with T-rings or ZWO cooled cameras with standard ZWO spacers or OAG/EFW.