> Steve Traudt wrote: I have the 28-135 IS and the 100-400 IS. Does it hurt, > help or make no difference to leave IS engaged when on a tripod? How about a > mono-pod? > Hi Steve,
I have both the 28-135 IS USM and the 100-400 IS USM. I only have a simplistic understanding of Image Stabilization (ignoring vari-angle prisms used in some video and binocular optics). The 28-135 has a first-generation basic IS mechanism - two axis, ON-OFF switch, should be switched off on sturdy tripod, usable on monopod. Offers 1.5 to 2 shutter steps of shake reduction. The 100-400 has a second-generation IS mechanism which adds switchable two axis (mode 1) or single axis (mode 2). Rated at 2 shutter steps of shake reduction. The Super-Telephoto lenses (300/2.8 IS, 400/2.8, 400 DO, 500, 600) have the third-generation mechanism which adds the ability to cope with tripod use. The fourth-generation mechanism is present in the EF 70-200 IS USM, which has the same specs but offers up to 3 shutter steps of shake reduction. Cheers Julian Loke * **** ******* *********************************************************** * For list instructions, including unsubscribe, see: * http://www.a1.nl/phomepag/markerink/eos_list.htm ***********************************************************
