An ultra-high power telephoto lens with a focal length equivalent to 600mm on a 35mm film camera. Combines the brightness of an F2.8 aperture with the compact size of the Four Thirds System. In addition, the generous 3 extra-low dispersion (ED) lenses deliver superb image quality. Built-in focus-limit switch and focus-stop button make this ultra-high power telephoto lens very easy to use. Neutral, ND4, ND8, and polarizing inner filters included as standard equipment.

Technical specifications:

• Focal Length 300mm Telephoto (600mm 35mm equivalent)
• Lens Construction 13 elements in 11 groups
• Angle of View 4.2°
• Closest Focusing Distance 6.6 ft. (2 m)
• Dimensions 5.1 D x 11.1 L (129 mm x 281 mm)

Related links:

The lens webpage at Olympus
Compare Olympus 300mm f/2.8 ED Lens prices
Four thirds website

The Mighty Mouse is great. Going back to a mouse that does not have a tracking ball is like going back to steam-powered computers.

But from time to time, the little ball sticks. It will either track up but not down, or down but not up, or… you get the idea.

So I googled for answers and most people suggest that you turn the mouse upside down, hold down the ball with one finger and blow air into the space that is created around the ball, to dislodge any crud.

And it has worked for me. I just blow into the space - no canned air, no compressed air, just a few quick sharp puffs of breath into the little space between the Scroll Ball and the hole it is in, and it clears it.

But last night it didn’t work - maybe I had a little grease on my finger that got transferred to the Scroll Ball; maybe the crud had accumulated. Whatever the reason, blowing didn’t clear it.

So I sprayed a drop of computer-screen cleaner onto a tissue, using only enough to be sure it was just ever so slightly damp but not wet, and rolled that over the ball. Magic - it’s like new.

Ze Mighty Mouse