tech-review

samsung gear s3

The Samsung Gear S3 is a Tizen-based circular smartwatch developed by Samsung Electronics. It was released on 18 November 2016.

The Gear S3 has two models: Classic and Frontier. The Classic has a silver watch case and black leather band, while the Frontier has a black watch case and rubber band. Both are rated IP68 (water resistant) and have GPS, as well as heart rate monitor sensors. One notable feature is that the bezel ring rotates as part of the user interface, although users can also navigate by swiping the screen and/or using the two buttons on the side.

Its successor, the Samsung Galaxy Watch, was released 9 August 2018.

Model^[3]	Gear S3 Frontier	Gear S3 Frontier (LTE)	Gear S3 Classic (LTE) (Bluetooth®)
Display	1.3” Circular Super AMOLED, 360 x 360, 278ppi, Always-on display, Corning Gorilla Glass SR+
Processor	Exynos 7270 Dual Core 1.0 GHz
Operating System	Tizen Based Wearable Platform 3.0.0.2
Size	49 x 46 x 12.9
Weight	62g		57g
Memory	4GB Internal memory, 768MB RAM
Connectivity	Bluetooth 4.2, Wi-Fi b/g/n, NFC, MST, GPS/Glonass	3G/LTE, Bluetooth 4.2, Wi-Fib/g/n, NFC, MST, A-GPS/Glonass	Bluetooth 4.2, Wi-Fi b/g/n, NFC, MST, GPS/Glonass
Sensors	Accelerometer, Gyro, Barometer, HRM, Ambient light, Speedometer
Battery	380 mAh Li-Ion battery
Charging Technology	Wireless charging (WPC Inductive)
Part No.^[4]	SM-R760	SM-R765	SM-R770

يوسف November 07, 2018 0

Canon EOS Rebel T6 Digital SLR Camera Kit with EF-S 18-55mm f/3.5-5.6 IS II Lens, Built-in WiFi and NFC - Black

Canon EOS (Electro-Optical System) is an autofocus single-lens reflex camera (SLR) and mirrorless camera series produced by Canon Inc.. Introduced in 1987 with the Canon EOS 650, all EOS cameras used 35 mm film until October 1996 when the EOS IX was released using the new and short-lived APS film. In 2000, the D30 was announced, as the first digital SLR designed and produced entirely by Canon. Since 2005, all newly announced EOS cameras have used digital image sensors rather than film. The EOS line is still in production as Canon's current digital SLR (DSLR) range, and, with the 2012 introduction of the Canon EOS M, Canon's mirrorless interchangeable-lens camera (MILC) system.

The name "EOS" was chosen for Eos, the Titan goddess of the dawn in Greek mythology, and is often pronounced as a word (/ˈiːɒs/), although some spell out the letters, reading it as an initialism.

The EOS emblem was created using Handel Gothic typography.

It competes primarily with the Nikon F series and its successors, as well as autofocus SLR systems from Olympus Corporation, Pentax, Sony/Minolta, and Panasonic/Leica.

At the heart of the system is the EF lens mount, which replaced the previous FD lens mount, which mainly supported only manual-focus lenses.

ef lens mount :

The bayonet-style EF lens mount is at the centre of the EOS camera system. Breaking compatibility with the earlier FD mount, it was designed with no mechanical linkages between moving parts in the lens and in the camera. The aperture and focus are controlled via electrical contacts, with motors in the lens itself. This was similar in some ways to Canon's earlier attempt at AF with the T80. Other manufacturers including Contax (with its G series of interchangeable-lens 35 mm rangefinder cameras), Nikon's 1983 F3AF and Olympus(with its Four Thirds System) have since embraced this type of direct drive system. It is a large lens mount compared to most of its competition, enabling the use of larger aperture lenses.

eos flash system :

The flash system in the EOS cameras has gone through a number of evolutions since its first implementation. The basic EOS flash system was actually developed not for the first EOS camera, but rather for the last high-end FD-mount manual-focus camera, the T90, launched in 1986. This was the first Canon camera with through-the-lens (TTL) flash metering, although other brands had been metering that way for some time. It also introduced the A-TTL (Advanced TTL) system for better flash exposure in program mode, using infrared preflashes to gauge subject distance.

This system was carried over into the early EOS cameras wholesale. A-TTL largely fell out of favor, and was replaced by E-TTL (Evaluative TTL). This used a pre-flash for advanced metering, and used the autofocus system to judge where the main subject was for more accurate exposure. E-TTL II, which was an enhancement in the camera's firmware only, replaced E-TTL from 2004.

Canon Speedlite-brand flashes have evolved alongside the cameras. They are capable of wired and wireless multi-flash setups, the latter using visible or infrared pulses to synchronise. Canon also produces Speedlite accessories, including the OC-E3 Off-Camera Shoe Cord, which can be used to hand-hold the flash while allowing the camera to control it through the cord. The Off-Camera Shoe Cord is popular among portrait photographers who need to have more control over lighting than a camera mounted flash can offer.

eos cameras :

As of 2017, Canon has released no fewer than 70 EOS SLR and DSLR camera models, starting with the introduction of the EOS 650 in 1987. In the 1990s, Canon worked with Kodak to produce digital camera bodies, starting with the EOS DCS 3 in 1995. The first digital EOS SLR camera wholly designed and manufactured by Canon was the EOS D30, released in 2000.

Canon sold two EOS cameras designed to use the APS film format, the EOS IX and the EOS IX Lite.

Canon also sold a manual-focus camera, the Canon EF-M, which used the same EF lens mount as the EOS cameras. It came with all the automatic and manual exposure functions but lacked autofocus. It came equipped with a split-screen/microprism focusing screen for precise manual focusing.