Posts tagged ‘lens’

Colored Sunglass Lenses Can Improve Your Sight

Let me be clear, they don’t improve the focusing power of your eyes but they can change the way things look so you recognize them more easily. That’s important when reaction time is critical.

Yellow lenses are a popular option but it’s a myth that they make things brighter — they do not amplify light. But, according to the American Academy of Ophthalmology, they do enhance depth perception. This is because they block some of the blue light that can make objects look hazy and reduce sharpness.

For this reason, yellow lenses are popular with pilots, cyclists, shooters and boaters in low light. In daylight, blue lenses are good for pilots and skiers because they enhance the contrast between objects that are white (snow and clouds) and other objects. For boaters, red lens are good because they increase the contrast between water and objects that are in the water.

Although colored lenses can increase contrast in specific conditions, the downside with any colored lens is that they obviously distort color. Brown colored lenses are the happy-medium; they offer minimal color distortion while improving contrast, so they’re great for everyday use.

Big thanks to Todd for sharing this secret with me!

Sources: American Academy of Ophthalmology (PDF)

January 7, 2010 at 12:40 am Leave a comment

How to Properly Focus Your Digital Camera

If you’re like me, you know how awesome it is when a stranger offers to take your picture on vacation. But, they can easily undo the awesome if they don’t know how to focus.

I wouldn’t consider myself an expert, but I used to sell digital cameras back in college and I’ve owned half a dozen or so. Frankly, if you’re reading this then you probably think you have something to learn.  Maybe a lot (or all) of your photos are blurry?

It usually takes a moment for your camera to properly focus on the subject, so if you press the shutter release button hard and expect a good picture instantly, then you’re betting on a long shot.

Most digital cameras have a number of different focus modes — the automatic mode is common for casual users. To initiate auto focus, you must press the shutter release button half way. Most cameras have a green light on the back of the camera or inside the viewfinder that will blink while the camera is focusing. The green light will stop flashing when the camera has focused on the subject. Most cameras also beep at this time. Once the green light is solid, press the shutter release button down the rest of the way to take the picture.

Viola. You’re in focus.

PS – Can we simplify “digital cameras” to just “cameras” yet?

Photo: Dr. Pat (Creative Commons) | More info: DigicamHelp

December 15, 2009 at 1:16 am Leave a comment

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