Does anyone make one of these, or something that can be used as one of these, for MFT? I'm thinking of something similar to - * the Telescopic Auto Tube 65–116 for Olympus OM - http://www.alanwood.net/photography/olympus/telescopic-auto-tube.html which with the right lens (the 135?) designed to be used with it, still allows infinity focus, and has a tripod mount on it ( ), and doesn't need a stage/some delicate leather bellows, or * the Vivitar 2x Macro Focusing Teleconverter - http://www.pentaxforums.com/userreviews/vivitar-2x-macro-focusing-teleconvertor.html which has glass in it and is a really neat toy, acting as a 2x teleconverter on any lens while retracted and still leaving you with the ability to focus to infinity, and by turning the ring you can change magnification smoothly from 1:20 to 1:1 on a standard 50mm (different lenses more/less). What happened to these as, well, as a thing? From using the Vivitar one I can only guess they were too awesome to live?