> The 4.3" (10.9cm) quoted* for working distance for the older EF 100 f2.8 macro > non-USM agrees closely with the 11cm (lens front to subject) I measured when I > had mine. > (* in the link http://www.photo.net/bboard/q-and-a-fetch-msg?msg_id=000rXL
Hi Malcolm, That is very strange. Do you have any explanation for why Canon uses 15cm? Is it because the front element of the EF 100mm f/2.8 macro is recessed? Or because many Canon lenses can focus closer than the published minimum object distance (and often further than infinity)? Cheers Julian Loke * **** ******* *********************************************************** * For list instructions, including unsubscribe, see: * http://www.a1.nl/phomepag/markerink/eos_list.htm ***********************************************************
