QUOTE(dayalan86 @ May 9 2007, 12:46 AM)
Olympus Digital Lenses, means that the lens has a smaller inner diameter with anti reflective coating on the inner side (because digital sensor can reflect a certain amount of light) and is made to match the 4/3rd imaging sensor size instead of the normal 35mm film size (unlike Canon or Nikon).
Just to let you know, my old Zuiko OM 50mm f/1.8 prime lens is also multicoated and is very effective in suppressing reflection between the lens elements my E-330's image sensor. Multicoats (aka. anti-reflective coating) has been around for a very long time already.
Even though the lens elements in the so-called for-digital lenses are smaller because they are designed to just nicely cast the image circle onto the 4/3-rd's or APS-C or whatever image sensor size, the addition of on-board focussing servo motors eat up the additional space and negate any weight savings. Just compare Olympus Zuiko Digital lenses with rival manufacturer's lenses of the same actual focal length ranges.
Added on May 9, 2007, 10:26 pmQUOTE(dayalan86 @ May 9 2007, 12:46 AM)
Nowadays most lenses have IC chips embedded with the MTF data which will assist the camera in choosing the right aperture settings for maximum details.
I would think this is only useful if the DSLR user plans to shoot mostly in 'P' mode ... but by then, I think that kind of defeats the purpose of having a camera with wealth of manual overrides...
What I heard is that on every Zuiko Digital lens, the on-board chip has unique calibration data that is fed to the camera body to achieve optimal focussing.
This post has been edited by cjtune: May 9 2007, 10:26 PM