To enable the focus to be precisely adjusted by manual focusing, Kowa spotting scopes also utilize a highly reputed dual-focus system. In addition to using a high-contrast optical system that enables the focusing peak to be easily determined, a dual-focus system consisting of a quick focus that swiftly matches the focus and a fine focus for delicate focus adjustment is used. This enables precise adjustment to be carried out, even under the severe conditions encountered in super-telephotography.

"Most consumers do not think about what happens to the data collected by their favorite smart home devices. In most cases, raw audio, images and videos are being streamed off these devices to the manufacturers' cloud-based servers, regardless of whether or not the data is actually needed for the end application," said Alanson Sample, U-M associate professor of computer science and engineering and the corresponding author of the study describing the device.

Materials provided by University of Michigan. Original written by Derek Smith. Note: Content may be edited for style and length.

The device could not only make patients more comfortable with chronic health monitoring, but it could also help protect privacy in public spaces. Vehicle manufacturers could potentially use PrivacyLens to prevent their autonomous vehicles from being used as surveillance drones, and companies that use cameras to collect data outdoors might find the device useful for complying with privacy laws.

PrivacyLens uses both a standard video camera and a heat-sensing camera to spot people in images from their body temperature. The person's likeness is then completely replaced by a generic stick figure, whose movements mirror those of the person it stands in for. The accurately animated stick figure allows a device relying on the camera to continue to function without revealing the identity of the person in view of the camera.

"Cameras provide rich information to monitor health. It could help track exercise habits and other activities of daily living, or call for help when an elderly person falls," said Yasha Iravantchi, a doctoral student in computer science and engineering who will present PrivacyLens July 18 at 4:30 p.m. BST session of the Privacy Enhancing Technologies Symposium in Bristol, U.K.

That extra anonymity could prevent private moments from leaking onto the internet, which is increasingly common in today's world laden with camera-equipped devices that collect and upload information. In 2020, a photo of a person on the toilet appeared on an online forum. The person didn't realize their iRobot Roomba had wandered into the bathroom, and that all its photos were sent to a start-up company's cloud server. From there, the photos were accessed and shared on social media groups, according to an investigation by MIT Technology Review.

The tripod mounting foot has a format that allows mounting on some types of Manfrotto and Gitzo video heads without requiring a quick shoe. Simple mounting and release is possible on the video heads mentioned above, so that the lens can be used without worrying about the tripod screw coming loose. Mounting can also be carried out on other manufacturers’ tripod heads. (1/4 inch screws are supported.)

202214 — ... lenses. We have fixed aperture lenses like the DA* 16-50/f2.8, and the variable aperture 18-55/f3.5-5.6 kit lens, they are in different ...

Sample has filed a provisional patent for the device, with the help of U-M Innovation Partnerships, and hopes to eventually bring it to market.

201456 — Depth of focus in optics is a measure of the tolerance of the placement of the image plane with respect to the lens. In photography, depth ...

MM Mesulam · 1988 · 583 — The nucleus basalis (NB) of the human brain is a large, complex, and highly differentiated structure. Many of its neurons are magnocellular, hyperchromic, ...

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16.11 (Millimeters, mm) - unit for measure distances, lengths, heights and widths in Metric Units. One millimeter is equal to 0.0393700787402 inches.

Anticipating the use of digital cameras made by several different manufacturers, a bayonet mount system is utilized that allows easy mounting and release. This makes it possible not only to exchange cameras, but also to exchange each of the mount adapters in an instant. Since the prism unit also employs an exchanging system that utilizes bayonet mounting, the switching between photographing and viewing can also be easily carried out.

"Our survey suggested that people might feel comfortable only blurring their face when in the kitchen, but in other parts of the home they may want their whole body removed from the image," Sample said. "We want to give people control over their private information and who has access to it."

Replacing patients with stick figures helps make them more comfortable having a camera in even the most private parts of the home, according to an initial survey of 15 participants. The team has incorporated a sliding privacy scale into the device that allows users to control how much of their faces and bodies are censored.

"There's a wide range of tasks where we want to know when people are present and what they are doing, but capturing their identity isn't helpful in performing the task. So why risk it?" Iravantchi said.

A lightweight lens hood is provided as a standard accessory. In order to increase the speed for introducing the subject into the field of view when carrying out super-telephotography, a sighting function is incorporated in the hood. The hood mounting screw has a special shape that assists with the swift sighting of objects when used in combination with the included sighting devices.

The 500mm super-telephoto lens only weighs around 1.9kg. The portability is extremely good, and the lightweight design also allows hand-held shooting. Further, when the mount adapter is removed, the compact design with a total length of only approximately 250mm allows it to be carried in a small rucksack.

The objective lens and focusing units utilize rubber O-rings to seal the housing of the lens for enhanced dust and weatherproofing.

"A smart device that removes personally identifiable information before sensitive data is sent to private servers will be a far safer product than what we currently have."

In order to limit chromatic aberration (color blur) to the utmost, which tends to easily occur in lenses with long focal lengths, one fluorite crystal lens and two XD (eXtra low Dispersion) lenses having particularly low dispersion capabilities are utilized. By bringing together advanced optical technology fostered through the development of spotting scopes, and incorporating fluorite crystal lenses with outstanding optical characteristics, high contrast and extremely sharp images can also be realized as a camera lens. Further, due to the high-level aberration correction and the utilization of a rounded diaphragm, an attractive effect can be obtained in out-of-focus areas as the pinnacle of imaging expression for a camera lens.

By connecting the optional prism unit and eyepiece, the telephoto lens can be used as a spotting scope by effectively making use of the high performance master lens optical system. Due to the utilization of a mounting and release system that uses a bayonet mount, the single telephoto lens can be easily used both for “photographing” and “viewing”. Clear images can be enjoyed with a feeling of transparency since there is no focusing screen.

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As different wavelengths leave the grating at different angles, they form a spectrum, or diffraction, order. Gratings can produce more than one diffraction ...

Raw photos are never stored anywhere on the device or in the cloud, completely eliminating access to unprocessed images. With this level of privacy protection, the engineering team is hoping to make patients more comfortable with using cameras to monitor chronic health conditions and fitness at home.

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Field of view (FOV) refers to the extent of the scene visible through a camera lens or optical device. It is the area that the lens can capture and display ...

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"But this presents an ethical dilemma for people who would benefit from this technology. Without privacy mitigations, we present a situation where they must weigh giving up their privacy in exchange for good chronic care. This device could allow us to get valuable medical data while preserving patient privacy."

By connecting an optional digital camera adapter to the lens in the spotting scope condition, it will be possible to carry out digiscoping using a compact digital camera. Using digiscoping, it will be possible to carry out even higher super-telephotography between approximately 1000mm and 3000mm*, allowing wild birds and other subjects to be photographed at long ranges that would not be possible using digital SLR cameras. (Eyepieces that support digiscoping: TE-11WZ, TE-17W, TE-10Z, and TE-20H）* 35mm format equivalent effective focal length

A new camera could prevent companies from collecting embarrassing and identifiable photos and videos from devices like smart home cameras and robotic vacuums. It's called PrivacyLens and was made by University of Michigan engineers.

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From the standard specification of 500mm F5.6, it is possible to change the focal length of the master lens to a brighter 350mm F4 super-telephoto lens using the TX07 optional mount adapter, or to a lens with an even higher super-telephoto effect of 850mm F9.6 using the optional mount adapter TX17. The 350mm and 850mm mount adapters have been designed specifically for use in combination with the master lens, and the incorporation of XD lenses also inside each of the mount adapters realizes an outstanding optical performance comparable to that of previous dedicated lenses. (All lenses support 35mm full size format.)