Kooka KK-O25 Extension tube
The Kooka KK-O25 Extension tube was designed for macro photography with Olympus SLR cameras. The extension tube enables you to focus much closer to small objects, so your subject will be bigger on your photo. All the capabilities of your camera and lens, such as autofocus and light metering, remain available.
The extension tube measures 25mm and is made of chromium. Of course you can also combine multiple extension tubes to focus even closer. Obviously there is no loss in image quality because they contain no optical elements.
The extension tubes come with lens caps to prevent dust from eventually entering your camera or lens.