> -----Original Message----- > From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED] Behalf Of Plumviewer > Sent: Friday, March 26, 2004 8:14 PM > To: [EMAIL PROTECTED] > Subject: Re: EOS Silly question about IS > > > Chip Louie wrote: > > > Hi Cotty, > > > > There are a couple of generations of Canon's IS, the first > generation was on
<<<SNIPPED>>> > > > > The second generation was introduced in the EF 300 4L IS with > the addition > > of mode 2 operation. This was the first professional quality IS lens > > design. This new version of IS was designed to allow the use > of IS while > > panning to follow motion. This version of IS was much improved > with almost > > none of the odd visual jitters that the first generation IS > lenses sometimes > > showed in the finder. This lens design was an "L" class lens > in build and > > optics but a soft when compared to the non IS EF 300 4L or EF > 300 2.8L of > > the time. This version of IS was quickly implemented in > several other Canon > > pro class teles and tele zooms including the EF 300 2.8L IS, EF > 400 2.8L IS, > > EF 400 4L DO IS, EF 500 4L IS, EF 600 4L IS, EF 100-400 4.5-5.6L IS. > > > > > Here, here -- the usually impeccably reliable chip is about to head off > over the edge. His statement below that it is the third generation that > "can also be used on a tripod without turning IS off. This is useful > for tripod shooters and especially useful for monopod shooters because > IS now works under all shooting conditions. When used with a stationary > camera mount IS will not introduce any jitters in the finder if you > leave IS on and use camera support." - is not correct. The version of > IS implemented in the great whites( the 300 and 400 f/2.8L; 500 and 600 > f/4, ) and the 400 f/4 DO showed "almost none of the odd visual jitters > that the first generation IS lenses sometimes showed in the finder." as > Chip stated. More importantly one does not need what Chip later > describes as third generation IS for use on a tripod without turning IS > off. Also note neither the 400 f/4 IS or 100t0 400 f/4.5-5.6L IS is > tripod worthy. > > > > > > The third generation of IS was introduced in the EF 70-200 2.8L IS zoom. > > This is the latest version of IS currently available in > production. Canon's > > third generation IS features IS operation to a full 3 stop > effective range, > > one stop more than Canon's second generation IS specs call for. This > > generation can also be used on a tripod without turning IS off. This is > > useful for tripod shooters and especially useful for monopod shooters > > because IS now works under all shooting conditions. When used with a > > stationary camera mount IS will not introduce any jitters in > the finder if > > you leave IS on and use camera support. > > > > There are several newly announced lenses from Canon that are unknowns at > > this point. Which generation of IS Canon will choose to use in > these new > > generally low-end lenses is a guess but I think they will all be third > > generation IS lenses. Lately Canon has been pushing its signature > > technologies like IS and DO downward in their lens lines to attract new > > buyers to the entry level Canon EOS DSLR bodies like the EOS 10D and EOS > > 300D/DRebel. We'll have to wait and see where Canon goes with these new > > lenses and which IS specs they give once they become available. > > ><<<SNIPPED>> > > > regards Chip > > Plumviewer > Hi Plumviewer, I didn't mean to say that first generation great whites with IS need IS turned off when mounted on a camera support but I suppose it could be read that way. The EF 300 4L IS and EF 100-400 4.5-5.6L IS lenses are either not quite full second generation IS (even though they were among the first with mode 2 operation which is why I call them 2nd gen), or the other second generation IS lenses like the great whites (which as you mention don't need IS switched off when used on a camera mount and only represent an improvement in IS?), are actually late second generation or gen 2.5?. Maybe the great whites should be considered third gen IS but this would not fit with Canon's description of the EF 70-200 2.8L IS as being third generation IS. Thanks for the clarification and help keeping it straight! Cheers/Chip * **** ******* *********************************************************** * For list instructions, including unsubscribe, see: * http://www.a1.nl/phomepag/markerink/eos_list.htm ***********************************************************
