Photographers understand that exposure plays a key role in capturing the proper and desired imagery. Understanding the basics of camera exposure related to ISO, Aperture and Shutter Speed is essential to successful photography and can often be the difference between a good photo or a great photo.
Understanding Camera Exposure: ISO, Aperture, and Shutter Speed Explained
Controlling your camera exposure is a fundamental part of achieving a good photograph. This is accomplished by adjusting the ISO, Aperture and Shutter Speed settings in your camera.
The ISO setting on your camera adjusts the sensitivity to light Think of ISO as the gatekeeper that allows the light in. The lower the ISO number, the slower the camera’s sensitivity to light. The higher the ISO number, the higher the light sensitivity — resulting in brighter images but with a greater risk to introduce noise. If the ISO is too high, the photograph will tend to appear week and lack detail, so it is important to find the middle ground with your ISO settings.
The Aperture setting on the camera affects both brightness and depth of field. The smaller the Aperture number (f-stop), the greater the amount of light allowed in and vice-versa. Additionally, the smaller the Aperture number, the less focus you’ll have on your subject. Depending on the type of photography you are doing, you’ll want to adjust this in order to properly capture your subject and/or the background.
Lastly, the Shutter Speed setting on the camera has a direct effect on the brightness of the image — essentially how long the shutter remains open and the length of time the light is exposed. A rule of thumb for this is if the Shutter Speed setting is faster, less light is exposed. However, if your camera is set to a slow Shutter Speed, a higher exposure of light will enter.
Overall, adjusting these settings can be tricky however when done correctly, can achieve amazing results. Experiment with each setting and become familiar with how they interact with each other in order to take greater control of your image exposure.
Fire-Blocking Basics | JLC Online | Codes and Standards, Framing
Fire blocking is an important part of home construction because it breaks up spaces that could help propagate a fire. While this isn’t always the most exciting part of building a home, it’s a necessary step that needs to meet the fire safety codes and standards. Knowing the proper techniques behind framing, fire blocking and sealing framed openings can help to ensure that your building project meets code requirements.
For most states, the fire blocking requirements are largely due to the International Building Code (IBC) and International Residential Code (IRC). Depending on the category of the assembly, the fire-resistance rating and the use of the building, typical installations may require either fire blocking or fire caulking.
Fire blocking is typically done by installing panels between studs, beams and joists and filing that space with either non-combustible material or materials that are slow burning and self-extinguishing. The alternate is using fire caulk which is appropriate for spaces at least 3.5” in height. Any gaps between framing and other non-combustible materials needs to be filled using caulk, foam, steel wool or other fire-rated materials.
Beyond fire safety, it’s also important to take into consideration other framing and fire blocking requirements such as smoke resistance and requirements related to sound transmission. With all construction projects, it’s always best practice to contact your local building department to understand any local requirements or development ordinances that don’t rely on the International Building Code.
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