Baader Planetarium VariLock 46 T2 Extension Tube 29-46mm Baader Planetarium VariLock 46 T2 Extension Tube 29-46mm - Tools - Extensions - Baader Warranty Comes complete with all tools needed The Baader VariLock T2 Extension Tube camera side connection can be replaced by a bayonet ring for Canon EOS and Nikon It is a complete adapter system to keep precise back focus distances The Baader VariLock T2 Extension Tube adds and extension of 29-46 mm