Camera shake
The problem occurs most frequently with digital compact zooms set on the telephoto end of the scale, and especially in low light conditions. As telephoto lenses capture far off subjects, any slight body movement will cause the viewfinder image to change composition dramatically. Camera shake can be solved by setting a shutter speed of 1/125th of a second or faster, but if you haven’t got faster shutter speeds can’t be used, use a tripod or steady yourself against a wall. Ultra-long telephoto lenses used on digital SLRs need a minimum 1/250th to offset the increase in camera shake because of the extra weight and awkward balancing involved. If light levels are too low to use a fast shutter speed, make your ISO higher or use a flash instead.
