Phil, It's the "hollow" extension tube used for 1:1 on 60 macro's & 100's. Although Leica listed a different tube for the 60's & 100's, I've found that both work equally well with the tube from the 60. Art ************************************** See what's free at http://www.aol.com. ------ Unsubscribe or change to/from Digest Mode at: http://www3.telus.net/~telyt/lrflex.htm Archives are at: //www.freelists.org/archives/leicareflex/