Panasonic Leica DG 100-400mm ASPH f/4-6.3 lens

introduction

model H-RS100400
100-400mm f/4.0-6.3 (200-800mm in 35mm full frame terms)
20 elements in 13 groups (1 aspherical ED lens, 1 UED lens, 2 ED lenses)
9 rounded aperture blades
close focus 1.3m
72mm filter
weathersealed
Power OIS image stabiliser with Dual IS compatibility
high speed digital signal exchange at 240 fps to comply with the high-speed, high-precision AF (Auto Focus) with DFD (Depth From Defocus) technology on LUMIX G cameras
focus limiter 5m to infinity
built in sliding lens hood
tripod mount
zoom lock
171.5mm / 6.75in long but extends upon zooming
83mm / 3.3in diameter
985g / 34.74oz excl. lens hood, tripod mount
$US1799

it seems that some of these lenses are depositing substantial amounts of metal dust into the camera body due to the lens mount - seems to be related to whether there is a rubber weatherseal or not, as some of those with the seal seem to have an issue - Panasonic seems to be offering to replace the lens if it has this issue
as with all Panasonic lenses on Olympus cameras you will lose some features:
- Dual IS / Sync IS is not supported
- ProCapture mode is not supported
- Auto Focus Stacking is not supported