ben jackson Posted July 5, 1999 Share Posted July 5, 1999 I'm interested to know where the max aperture changes for the EF 100-400/4.5-5.6L IS. Specifically I want to know whether it's a 300/4.5 or a 300/5.6 or something in between. I'm trying to weigh the zoom convenience against the (slightly) lower cost and (slightly?) higher quality of a 300/4 IS with(out) 1.4x tc. <p> The <A HREF="http://www.usa.canon.com/camcambin/cameras/eflenses/ef100n400.html">Canon website</A> helpfully mentions that the max aperture is printed on the lens barrel (presumably the part that's exposed by the push/pull zoom). Unfortunately no one ever seems to have any in stock to play with. Link to comment Share on other sites More sharing options...
bobatkins Posted July 5, 1999 Share Posted July 5, 1999 Pop Photography (Feb 99) report it as a 100/4.5, 200/4.5, 300/5.6 and 400/5.6, so it looks like it goes from 4.5 to 5.6 somewhere between 200mm and 300mm. Of course they may be working in 1/2 stop steps. If you have an EOS-1(n) or EOS-3 which work in 1/3 stop steps you might get back 1/3 stop at 300mm. Link to comment Share on other sites More sharing options...
michael_lopez1 Posted August 10, 1999 Share Posted August 10, 1999 When Photodo runs MTF tests on a zoom lens, they report its maximum aperture at each tested focal length. Surf to http://photodo.com and click on "Lens" near the top of the home page, then persevere until you bring up the right lens review. Link to comment Share on other sites More sharing options...
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