I almost always have a lens hood on my camera. While shooting without a lens hood can still produce great pictures most of the time, if any light happens to bounce into the lens from the sides, the contrast and color in the image is significantly reduced. Also, it is nice to have a lens hood for protection of the lens. However, there are some lenses on which a lens hood is simply unnecessary. I recently saw one of my photography students with a lens hood on his 50mm f/1.8 prime lens. It looked quite strange because most people don't use a hood on that lens.
Stair handrails are in place so you have something to grasp while using the stairs. It is important to have the rail at a comfortable height to prevent falls. According to Human Cornell, a handrail height of 36 to 40 inches is most effective in preventing falls when descending stairs.uilding Codes. National and state building codes suggest a handrail height of 30 to 34 inches, which is 2 to 6 inches shorter than the suggested height for safety. If you are installing stairs, however, you must obey building codes and set the handrail height accordingly.
minimum clear width of a stairway at or below the handrail, when one is required, is 31 Â½ inches, and 27. inches where two are required. Stair trim, stringers and other features may reduce the stairway width as. long as they do not extend beyond the allowable handrail projection. There is a width exception for. spiral stairways. The maximum riser height is 8 Â¼ inches and the minimum tread depth is 9 inches. Open risers are permitted provided the vertical opening between treads does not permit the passage of a. 4-inch-diameter sphere in stairways which have a rise exceeding 30 inches.