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.
A stair with a single riser or with two r isers. and a tread is permitted at locations not. required to be accessible by 780 CMR 11.00, provide d th at the risers and treads comp ly with. 780 CMR 1009.3, the minimum depth of the. tread is 13 inches (330 mm) and at least one. handrail complying with 780 CMR 1009.11 is.