> The close focus is 31cm Malcolm. The new lens also has full-time manual > focusing. > > Tim
Hi Tim, Thanks - I assume that's from the film plane mark? I've just measured the various distances with my original non-USM EF 100 f2.8 macro which also has internal focusing, but which I understand has a different construction to the USM version. At 1:1, lens length front to back 15.2cm; lens front-subject 11cm; lens hood-subject 7cm; film plane-subject 31cm - same as yours, I assume At 1:2, lens length front to back 13.0cm; lens front-subject 20.5cm; lens-hood-subject 16.5cm; film plane-subject 38cm. When I first got the lens I used it without any hood, and thought that my slides were a little lower in contrast than my other slides, even though the filter was coated, and clean; so I've always used a short lens hood on it since. No complaints now apart from the lack of FTM. Perhaps I should have tried it without hood or filter. As an afterthought I've dug out my X-700 with my Vivitar 90 f2.8 macro and done the same measurements: At 1:1, lens length front to back 17.8cm; lens front-subject 13cm; film plane-subject 36cm; At 1:2, lens length front to back 13.5cm; lens-front-subject 22cm film plane-subject 40cm The Vivitar lens isn't an IF lens so keeps its 90mm focal length throughout, and its front element isn't so deeply recessed as the Canon. Malcolm Stewart Milton Keynes, UK ----- Original Message ----- From: Tim Franklin <[EMAIL PROTECTED]> To: Yahoo EOS Group <[EMAIL PROTECTED]> Sent: Sunday, November 25, 2001 11:52 AM Subject: Re: EOS Canon 100mm Macro > on 24/11/01 9:28 am, Malcolm Stewart at [EMAIL PROTECTED] wrote: > > > Seeing as the USM version doesn't change length, what's the working distance > > like at 1:1? I've got the older version and there have been many a time > > when I've wanted to touch up the focus slightly, but I've had to switch to > > Manual by which time the butterfly has flown off! (I've fitted a hood to > > keep sunlight off the filter.) > > > > M Stewart Milton Keynes, UK * **** ******* *********************************************************** * For list instructions, including unsubscribe, see: * http://www.a1.nl/phomepag/markerink/eos_list.htm ***********************************************************
