2022719 — Introduction to Dark-Field Microscopy · Dark-field requires the use of a cone of light, no direct light enters the objective only reflected, ...

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Until Hideo Yamanaka published his 2009 “Method and apparatus for producing ultra-thin semiconductor chip and method and apparatus for producing ultra-thin back-illuminated solid state image pick up device”. The technology of back illuminating sensors was costly, complex and required further refinement to become a widely used sensor. Yamanaka found that by rearrangement of the imaging elements, increased light could be captured and thereby improve low-light performance. However, back thinning lead to a host of other problems such as cross-talk which causes noise, dark current and color missing between adjacent pixels. Thinning also made the silicon wafer more fragile.

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However, keep in mind that if you’re making a constant ring light, you’ll need to brush up on bulb types and use the right materials. That way your DIY version will be safe for repeated and prolonged use.

Professionals in portrait photography absolutely love these lights. They offer more diffused, soft light on the subject, while reducing the appearance of harsh shadows. Those functions alone make this a popular lighting choice for close-up portraiture. Ring lights can make your subject “pop” without washing out or changing the contours of the face in a way uneven lighting would. That makes these lights the perfect selection for portraits and selfies.

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Another thing to know: the power and size of the ring light does make a difference. If you want visible catch light on your subject’s eyes for portrait photography, you’ll need a much bigger ring light. However, smaller ring lights will give you the same effect if you’re going to do a lot of close ups. As for the power, it’s usually best to get one that has a dimmer. You will be able to easily adjust the power depending on the distance between your ring light and your subject.

Ring lights can be purchased as existing kits and fixtures, but there are also many tutorials on how to make your own DIY ring light. Ring lights are generally available in two formats: strobe and constant. Strobes are usually used for still images, while constant lights are the best ring lights for video content creators.

Lastly, take note of the color temperature. Even if you decide to use color gels to temporarily create more fun colors with the light, you’ll want  a natural default color. Ring lights are often best in fluorescent, warm white, or even stark white lighting — instead of warm yellow or bright white.

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You’ll know if a model is facing a ring light by the appearance of circular catch lights (or eye lights) in the subject’s eyes. These spectacular highlights instantly make the portrait more attractive and engaging, as they instantly draw the viewer’s attention.

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You can also check out a quick 10 minute YouTube on the subject at this link: https://www.youtube.com/watch?v=a5o6lZ-ROys

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Lighting is a key component not only for content creators but also for those work-from-home meetings. If you plan on being in front of your computer’s webcam for an interview, you’ll definitely want a light to add some clarity. The major difference between an LED light and a ring light is mainly the shape. LED lights will tend to have a more rectangular shape, whereas Ring lights will be in the shape of a ring.

Virtually every serious makeup artist on YouTube uses a ring light kit for makeup tutorials. These lights instantly enhance facial features and help show the true colors of the skin as well as the products. Artists simply place their makeup ring light in front of their cameras (or camera phone) and record away. Makeup artists also use ring lights while preparing models and brides for photoshoots.

Once your subject is ready, simply place the ring light in front of your camera. Whether you’re using a camera phone or a more professional camera — like the Sony Alpha a7 IV, Panasonic Lumix GH6, and Canon EOS R5 — make sure you position the lens right in the center of it so you get even lighting on your subject every time. Use a clip or even a stand or tripod to hold your camera and ring light in place.

A traditional front illuminated camera is constructed to mimic the human eye; a lens at the front and photodetectors at the back, a back illuminated sensor arranges the wiring behind the photocathode layer by flipping the silicon wafer and then thinning its reverse side so that light can strike the photocathode layer without passing through the wiring layer.

Additionally, LED lights are designed more for videography and product showcases. LED lights also tend to be a little more expensive than ring lights. The best thing about a ring light is that it has space for your camera to allow you to shoot through it. The shape of a ring light is designed to be used more for capturing faces. If you plan on having a ton of in-home meetings and interviews, or starting your own TikTok account, go with a ring light. However, if you plan on starting a YouTube channel, a Twitch channel or just want a wider light source, an LED light might be best.

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As a general rule, choose a long focal length lens, like 70, 135, or 200mm to isolate textures and distant features to create dramatic backgrounds. Wide focal ...

Today back illumination technology has made some significant progress and BI chips are now available from several manufactures of Silicon Chip technology. With higher sensitivity over a broader spectral region (deep UV to near IR) several industrial camera manufacturers are introducing back illuminated cameras. These cameras are ideal for ultra-low light applications like Astronomy, Spectroscopy and biological imaging. With back illumination, low light applications get increased Quantum Efficiency up to 95% and lower read noise at <2 e-rms. When every photon counts a camera with a back illuminated sensor should be your one and only choice. Check out PCO's new back illuminated 4.2 camera at the link below.

Using a ring light for the first time could be a little jarring. You now have this bright light aimed at your eyes while you’re on Zoom. When setting up your light, you want to make sure you’re not blown out (or too washed out).

Before going into your meeting, check your Zoom video preview settings. Play around with the ring light’s brightness and make sure it’s enhancing your features rather than making you look like too bright. Turn off any outside lights that you have on, as your light will be enough. This will also help your camera focus more on your face.

Photographers use ring lights for other types of creative lighting setups that don’t necessarily require you to shoot through it. Just take a look at this video from Daniel Norton for AdoramaTV:

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A ring light is a simple lighting tool that is commonly used for beauty shots, portraits, and macro photography. It features a number of small bulbs forming a circle or just one circular fluorescent bulb. When used in photography, it creates an attractive catch light on a subject’s eyes. At the same time, it emits even, diffused lighting, similar to a softbox, that helps eliminate shadows. You can position this light in front of the subject, with the camera situated in the middle of the circle.

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If you’re using constant light, you can easily adjust the power and your distance from the subject. This will get you your desired effect before clicking your shutter. If you’re using a flash version, you can do several test shots to determine the changes that you need to make. Think: distance and light strength.

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Some ring lights can plug directly into your computer and some can be plugged into the wall. Find out which one you prefer. A light with a wall plug frees up your USB ports for more peripherals. Once you use your ring light for the first time, you’ll never go back.

You can use clip-on selfie ring lights even when recording with a cell phone or tablet, making them a great inexpensive and portable option.

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For macro photography, these lights offer a slightly more front-focused lighting compared to a lightbox. Simultaneously, they distribute light around a small subject well enough to hide shadows and bring out more detail. With the right color temperature, a ring light can supplement natural light seamlessly. Kits are commonly used for floral and insect photography.

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Ring lights can be used for a variety of purposes in photography and videography. They also provide plenty of light for other professional uses. Here are some of the most common uses and considerations for the best ring light use.

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Because ring light kits are often very affordable, they’re a great choice for content creators who maintain a YouTube channel or do live streams on TikTok, Twitch, and other platforms. If you’ve ever wondered why someone looks well-lit even when using a webcam, they’re probably using a ring light. The best ring lights are arguably the top lighting option for YouTube videos, especially for vloggers and product reviewers.

A constant ring light is easier to adjust, because what you see is what you get as far as power and quality of light. Strobe ring lights that flash with every click of the shutter can help you save power, but may involve a steeper learning curve.