February 27th, 2013 - 08:42 AM
Many photographers buy very expensive lenses and in particular ones with vibration reduction or whatever you camera brand calls it; then they are surprized when they capture a spectacular image only to get it on the computer and the image is blurry. This is particularly true with telephoto lenses. The next thing they say is that they purchased a "soft" lens. That probably is not the case.
There is a simple rule to remember if you are using a lens with an "X" millimeter rating then in order to avoid lens blur you must set the shutter speed to 1/X or the reciprocal of the mm rating for that lens. If you are shooting with a 180mm lens set the shutter speed to 1/180 or faster. You can go to 1/200 or 1/320, or faster. But if you go slower, the slower you go the more likely you are to end up with a blurry image. 1/160 may not blur too much but 1/60 would disappoint you.
Keep this rule in mind when you are metering to capture an image, if the meter sets you up for a blurry image adjust your ISO, aperture (f/stop), and shutter speed so that X = 1/X or faster. Didn't know you would ever use basic algebra ever again did you.