> Date: Mon, 31 Mar 2003 22:56:38 +0200 > From: "Stefan Gerris" <[EMAIL PROTECTED]> > Subject: RE: EOS IS and Long Teles > > > > If I use my 300 f4 IS on a locked-up tripod the IS system > > > gets confused and the well-known floating image occurs. > > > I imagine that at high shutter speeds this does not matter, > > > it is far smoother than if I hand hold with the IS off, but > > > at slow shutter speeds it would certainly cause problems. > > > Hand holding with a 2x extender, the effect of IS is miraculous. > > ------------------------------------------------------------- > > Keith, > > > > You may be right, but I have used them 300mm and 600mm IS > > lenses on a tripod as well as my 100-400mm IS and not a problem. > > Maybe I was lucky. BTW, have you experienced this well known > > floating image yourself? I have also used the 28-135mm IS > > on a tripod with slow shutter speeds and the results were > > perfect. > > > > Peter K
"Tripod-Enabled" IS was introduced with the 300 2.8 IS through 600 F4 IS lenses, so it would be a real surprise if you had a problem with one of these. OTOH, the 28-135, 75-300, 300 F4, and 100-400 IS lenses are based on older IS technology and all CAN have a problem when mounted on a tripod. That said, I have succesfully used all of these with IS on a tripod. When I used inexpensive tripods or poor techinique, IS worked most of the time on these lenses. As I've upgraded to better tripods, and hopefully improved my technique, I have found that sometimes IS will actually vibrate the image if not turned off. It is more likely when I lock down the tripod head than when it is left loose. My sense is that the IS works on these lenses IF the mount is not totally stable. For the most part, you can see the effect when you press the shutter half way. This makes it relatively easy to avoid problems if you just pay attention to what you see in the viewfinder before taking the shot. I have taken to leaving IS off for longer night exposures, though, after losing a few frames with my 100-400 that look like IS flaked out somewhere into the shot. Paul Wasserman * **** ******* *********************************************************** * For list instructions, including unsubscribe, see: * http://www.a1.nl/phomepag/markerink/eos_list.htm ***********************************************************
