Out of my own curiosity, and at the behest of another list member, I've been doing some informal, machine-print comparison "tests" between the EF 28-90 that comes as the Elan 7 kit lens, and the 28-135 IS that I upgraded to. Partly just to see how "bad" the 28-90 is. :-) Predicatbly, at the machine print level, you can't tell a whole lot. (There are differences, though, in color rendition, and "bokeh.") HOWEVER, one thing is really obvious - the zoom ring calibration is very different. I took some photos of roses under as controlled circumstances as I could contrive used a tripod, gray card reading, manual setting, etc. I also set both lenses at the same point on their zoom range, by the scale on the lens - NOT by matching images in the viewfinder, because I was curious about that aspect. Well, they are really different. How can I tell which is more accurate? Is there a home-style test, or way of determining actual focal length? I know photodo lists the 28-135 as actually being a 29-129, and the images - at 70mm - from that lens were considerably smaller than the same image from the 28-90, which hasn't made it onto the photodo list yet. Finally, is this any different with L zooms? Somebody I bet has compared, say, the 70-200 to the 100-400 where they overlap. Are they more accurately indicated? Ken Durling Website http://home.earthlink.net/~kdurling/ Alternate e-mail: [EMAIL PROTECTED] * **** ******* *********************************************************** * For list instructions, including unsubscribe, see: * http://www.a1.nl/phomepag/markerink/eos_list.htm ***********************************************************
