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What features matter most depend on each individual’s priorities. But if you’re looking for a full range of functions, start your search with the EOS R6 Mark II. Ideal for advanced amateurs, the EOS R6 Mark II is well suited for a range of photo and video needs, including professional production, vlogging, still pictures and filmmaking. It features a 24.2 megapixel full-frame CMOS sensor; highly accurate subject detection with human, animal, vehicle and automatic settings; continuous movie recording that, depending on the frame rate, can record up to six hours; and advanced creator modes like Canon Log. A second option, the budget-friendly EOS R8 is aimed at the up-and-coming video or photo enthusiast. Extremely lightweight and compact, the EOS R8 shoots up to 6-fps with 1st-curtain Electronic shutter, and up to 40-fps with full electronic. For video, it offers up to two hours of continuous recording.

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While there’s something nostalgic about holding negatives in your hand, the technology of digital cameras now far exceeds that of film. For example, the ISO – the image sensor’s sensitivity to light – of digital cameras can now reach into the hundreds of thousands. You can also change the ISO with every shot; with film, it can only be changed with a new roll. With digital cameras, you can see your photo immediately and make adjustments before you click the shutter again. With film, you won’t know what you have until you develop the images.

In the current Canon lineup, your best option is the PowerShot SX70 HS compact digital camera, which features 65x optical zoom (equivalent to 21-1365mm in 35mm format). The long optical zoom range offers the flexibility to capture subjects in a variety of angles, perspectives and focal lengths. You may also want to consider an interchangeable lens camera, which gives you multiple lens options and greater overall flexibility. The RF100-400mm F5.6-8 IS USM is a compact, lightweight telephoto lens for EOS R Series cameras. It also accepts RF1.4x and RF2x tele extenders, giving you the effective maximum focal lengths of 560mm and 800mm respectively.

Fresnel lenses can be manufactured from a variety of substrates. They are manufactured from acrylic to polycarbonate to vinyl, depending on the desired wavelength of operation. Acrylic is the most common substrate due to its high transmittance in the visible and ultraviolet (UV) regions, but polycarbonate is the substrate of choice in harsh environments due to its resistance to impact and high temperature.

Another common application for a Fresnel lens is magnification. It can be used as a magnifier or projection lens; however, due to the high level of distortion, this is not recommended. Also, the image quality does not compare to that of a higher-precision system given the amount of distortion.

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The simple answer is yes! Most cameras do not come with a memory card, so you will have to buy one (and a backup as well). You can still take photos without a memory card, but your images will only be in the camera for a moment, not stored permanently. Check your camera’s manual for memory card requirements.

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A Fresnel (pronounced fray-NEL) lens replaces the curved surface of a conventional optical lens with a series of concentric grooves. These contours act as individual refracting surfaces, bending parallel light rays to a common focal length (Figure 1). As a result, a Fresnel lens, while physically narrow in profile, is capable of focusing light similar to a conventional optical lens but has several advantages over its thicker counterpart.

The first Fresnel lenses were made by tediously grinding and polishing glass by hand. Eventually, molten glass was poured into molds, but it was only with the development of optical-quality plastics and injection-molding technology in the 20th-century that the use of Fresnel lenses in many industrial and commercial applications became practical.

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Fresnel lenses consist of a series of concentric grooves etched into plastic. Their thin, lightweight construction, availability in small as well as large sizes, and excellent light gathering ability make them useful in a variety of applications. Fresnel lenses are most often used in light gathering applications, such as condenser systems or emitter/detector setups. They can also be used as magnifiers or projection lenses in illumination systems, and image formulation.

Yes, digital cameras produce outstanding video quality. All Canon mirrorless and DSLR cameras have video capability. Some models can record for over an hour. (The EOS R1 and EOS R3, for example, can record for up to six hours, depending on the resolution and frame rate used.) Make sure to check the manual to ensure you’re using the right memory card; you’ll need a higher-end card to shoot in higher resolution. One big benefit of using a digital camera for video is the large sensor size, which will help you produce cinematic-quality videos that you can watch on your TV or other bigger screens.

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While commonly found in solar applications, Fresnel lenses are ideal for any application requiring inexpensive, thin, lightweight positive lens elements. Fresnel lenses are not new technology, but their pervasiveness has increased with improvements in manufacturing techniques and materials. Fresnel lenses are truly unique optical lenses which make them a great tool for a range of interesting and fun optical designs.

Stepped lens where the lens effect is achieved by the concentric arrangement of lens segments. Fresnel lenses are used for stage spotlights and spotlights with ...

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One of the most common applications for a Fresnel lens is the collection of solar light, which is considered very nearly parallel (an infinite-conjugate system). Using a Fresnel lens for light collection is ideal for concentrating light onto a photovoltaic cell or to heat a surface. For example, a Fresnel lens can be used for popular home maintenance such as heating a home or pool! In these cases, the overall surface area of the lens determines the amount of collected light.

To take advantage of this physical property, 18th-century physicists began experimenting with the creation of what is known today as a Fresnel lens. At that time, grooves were cut into a piece of glass in order to create annular rings of a curved profile. This curved profile, when extruded, formed a conventional, curved lens – either spherical or aspherical (Figure 2). Due to this similar optical property compared to a conventional optical lens, a Fresnel lens can offer slightly better focusing performance, depending upon the application. In addition, high groove density allows higher quality images, while low groove density yields better efficiency (as needed in light gathering applications). However, it is important to note that when high precision imaging is required, conventional singlet, doublet, or aspheric optical lenses are still best.

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For travelling, look for a camera that’s compact and light. A camera with good zoom will help you capture photos even when you can’t get as physically close to something as you’d like. The PowerShot SX740 HS features a 40x optical zoom lens (equivalent to 24-960mm) and 4K video capabilities. It also includes automatic image transfer, which can wirelessly send what you’ve captured to your computer and other compatible devices. Built-in flash is also a good feature to have and is available on entry-level cameras. The compact EOS R100 was designed for first-time mirrorless camera users and features autofocus with eye and face detection as well as Bluetooth™ and Wi-Fi® connectivity. No matter what camera you choose, make sure to pack a second battery – just in case!

A Fresnel lens can easily collimate a point source by placing it one focal length away from the source. In a finite-conjugate system, the grooved side of the Fresnel lens should face the longer conjugate (Figures 3 - 4) because this produces the best performance.

The best digital cameras for beginners are usually small and compact, all the easier to make the jump from a smartphone to something more specialized. The best entry-level digital cameras will also feature built-in automatic Scene Mode. The camera automatically chooses the appropriate settings when you select a shooting mode (for example, sports, panning, food or night portrait) for your subject or scene. Built-in flash is also good for beginners. It’s a handy tool to ensure you take great photos as you learn how to compensate for low-light conditions with shutter speed and aperture. Some entry-level digital cameras are sold as dual lens kits. Having two lenses – typically a wide-angle and a telephoto – out of the gate gives you more variety and encourages you to dive right into the world of interchangeable lenses.

While phones continue to advance their imaging technology, digital cameras are still better for capturing images and videos. One big advantage is the variety of interchangeable lenses. With mirrorless and DSLR cameras, you can switch between speciality lenses, including macro, tilt-shift and telephoto. Digital cameras also have larger image sensors; in general, a larger sensor produces higher quality images. Autofocus on digital cameras – especially for tracking people and animals – still outperforms the capabilities of a smartphone. Digital cameras typically have a range of accessories designed to expand their capabilities. The Canon EOS System includes Speedlite flashes, wireless file transmitters, GPS receivers and more to help users get the most from their camera.

While French physicist Augustin-Jean Fresnel (1788 - 1827) was not the first to conceptualize a Fresnel lens, he was able to popularize it by integrating it into lighthouses. Since then, Fresnel lenses have been utilized in a variety of applications, from light collimation and light collection to magnification.

The driving principle behind the conception of a Fresnel lens is that the direction of propagation of light does not change within a medium (unless scattered). Instead, light rays are only deviated at the surfaces of a medium. As a result, the bulk of the material in the center of a lens serves only to increase the amount of weight and absorption within the system.