I don't like posting URL's with mainly non-English text-content, but this one is quite interesting.... http://www.weihenstephan.org/~joachenk/makrozoom.html (German) The writer starts by describing the Zeiss Tessovar macro-zoom as the only true macro-zoom (ignoring both the Minolta 3-1x and Canon 5-1x micro-lenses IMO), but he is then confronted with the results of a normal EOS-zoom (28-135), reverse-mounted, through a Novoflex reverse-adapter, being optically on par with results from Zeiss Luminar lenses (considered state of the art in photo-micro land). It is optically explained by the fact that the big front lens of the zoom, now facing the camera, is only used in the center, where even a lousy engineer can do a decent job. This is similar to the theory of why a TS-E 24/3.5 is still so good when being combined with a 2x converter.... Interesting side-note: the 28-135 offers a continous focus/magnification range of infinity(!!) at 135mm to 3:1 at 28mm (nearly touching the glass, the downside of a small focal length, especially since the diameter of the (then) front lens is much larger than say a Luminar). More photo-micro data, including the Tessovar, can be found on my homepage: http://www.a1.nl/phomepag/markerink/mainpage.htm (or /microlen.htm & /tessovar.htm directly) -- Bye, Willem-Jan Markerink The desire to understand is sometimes far less intelligent than the inability to understand <[EMAIL PROTECTED]> [note: 'a-one' & 'en-el'!] * **** ******* *********************************************************** * For list instructions, including unsubscribe, see: * http://www.a1.nl/phomepag/markerink/eos_list.htm ***********************************************************
