
Originally Posted by
SlvrScoobie
Well although its not a Reversed lens, those extention tubes will get you pretty high mag on normal lenses. Usually 1:1 occurs around the FL of the lens, in extention tubes. IE: 35mm lens hits 1:1 with 35mm of extension, 50mm lens with 50mm of extension.
This is also why usually a 100mm macro isnt F2.8 at 1:1, because it has so much internal extension, that its f5.6. same with these tubes. Youll loose about 3 stops with all the tubes added, and youll be reading F0.0 in the viewfinder (no electrical contacts) but it should still meter properly (shutter speeds that is) and youll have to MF but AF wont work at those mag's anyway. only problem is that youll always be shooting wide open.