Olympus MC-14 1.4x Teleconverter Lens for Olympus 40-150mm f/2.8 PRO Lenses - Black
$349 to $349 (Average price: $349.99)
"Compatible with Olympus 40-150mm f/2.8 PRO lenses - dust- and splash-proof design - includes a lens cap, rear lens cap and lens case"