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Different type of DSLR lenses and what kind of photography they are used for

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DSLRs are amazing apparatus in modern day photography world. Some of these modern digital cameras now come with user-friendly setup and their prices are not as high as they used to be. While DSLRs help create art, choosing the right lens is important to get the perfect shot. Two most important elements to consider are focal length and depth of field. Different lenses have different purpose, and hence you need to ask yourself what you want to capture – portraits, landscapes, architecture, action sports etc. Here are some of the key lenses that are meant for different situations and address specific photography needs.

Prime lens

Prime lenses are mostly helpful while capturing portraits where you require sharp focus and wide aperture. These lenses have one focal length, which means you can’t zoom in or zoom out. But their simple design provides you refined visuals and higher quality images. The standard 50mm lens does the basic job of capturing portraits, close-ups with shallow depth of field and good bokeh effect. There are other lenses as well like 35mm, 85mm which are not that expensive. While these lenses may not provide zoom feature and require you to physically move to take the correct shot, but limiting yourself to fixed focal length allows you to experiment, explore and add effects that standard lenses won’t let you.

 

Wide-angle lens

Wide-angle lens have small focal lengths (18-30mm) and are useful when you are trying to capture broader area.

Landscape shots perfectly fit in the wide-lens frame where you try shooting scenic beauty, interiors and pull more of the subject in the photograph. These lenses extend the possibility to capture more in an image but they have a few shortcomings as well. For instance, if you are taking a shot of a building from low angle with the subject in horizontal alignment you can experience distortion. A few expensive wide-angle lenses can rectify this issue or alternately, you can use photo editing tools to make the corrections.

Telephoto lens

Telephoto lens removes the barricade of physically getting closer to a subject to capture it. These lenses are ideal for wildlife photography where you try capturing animals, birds etc. from a distance. Telephoto lens, however, flattens depth and at times makes the subject appear artificial. But these lenses do a perfect job of isolating individual subject and keep the foreground sharp. Lenses from 100mm and above are suitable for capturing subject far away.

But while these lenses magnify everything, it is necessary that they have optical image stabilisation to avoid motion blur when you hold the camera in your hand rather than using a tripod.

Macro lens

Macro lenses come in handy when you are trying to shoot small objects from up close. These lenses magnify small subject and offer close focusing distance. Some macro lenses provide magnification of up to 10x. Lenses with a focal length between 90mm to 105mm are best suited to shoot extreme close-up shots. These lenses have ‘convenient minimum focus distance’ and adds a natural effect to the image. Like prime lenses, these lenses are also capable of taking pleasant portraits. Macro lens with an aperture around f/2.8, good auto & manual focus and image stabilisation can perform the trick of capturing a buzzing bee, insects etc., up-close.

Fish-eye lens

Fish-eye is the ultra wide-angle lens that is useful when you are trying to fit in almost everything possible in the frame. These lenses are popular in the area of artistic photography, extreme sport, wide panorama etc. The fisheye lenses have very large depth of field which means the images that you take will appear sharp from foreground and background as well.

Fish-eye Lens These lenses are popular in the area of artistic photography, extreme sport, wide panorama etc
These lenses, however, suffer from barrel distortion (curved edges) making the subject at the centre look bulged out.

Further, it produces high distortion. You can make the most of these lenses while shooting crowds, architecture etc. The fish-eye lens can capture shots with a field view of 180 degrees and some can even cover close to 360 degree.


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Bose Frames AR Audio Sunglasses Launched in India, Priced at Rs. 21,900

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Over a year after originally showcasing its audio AR sunglasses, Bose is bringing them to the Indian market. The company on Thursday announced that the sunglasses, which are simply known as Bose Frames, will go on sale beginning next week in the country alongside Bose Frames Lens Collection. The Bose Frames combine three functionalities into one device – premium sunglasses, wireless headphones, and audio AR features. The Bose Frames are the company’s first product to be based on the company’s AR platform.

The Bose Frames carry a price tag of Rs. 21,900 and will be offered in two universal styles – the larger Alto and the smaller Rondo. The Bose Frames Lens Collection of non-polarised and polarised lenses will retail at Rs. 1,990 and Rs. 2,990, respectively. The sales open June 20 via select resellers and Bose stores in the country.

The Bose Frames are essentially a pair of sunglasses that pack a tiny Bose audio system in the temples. This audio system effectively turns them into a wireless pair of headphones. The Bose Frames also include a microphone and multi-function button on the right temple for power and pairing, Siri and Google Assistant, calls and commands, or to pause and skip songs.

 

“With a proprietary open-ear design, they [Bose Frames] take micro-acoustics, voice control, and personal audio to an entirely new level, so users can stream music and information, take and make calls, and access virtual assistants from — while keeping playlists, entertainment, and conversations private,” Bose said in a statement.

Like many wearable devices, the Bose Frames act as a companion device to your smartphone and need the same for processing the information and connecting to the Web.

As we mentioned earlier, the Bose Frames will be released in two designs – Alto and Rondo. Alto is square and angled, whereas Rondo is round and smaller. Both can block up to 99 percent of UVA/UVB rays and weigh just 45 grams. The lenses can be easily popped out and replaced.

Apart from the audio capabilities, the Frames are also compatible with Bose’s AR platform. The Bose Frames don’t include any visual AR capabilities, but they can provide audio AR input to enhance your experience.

“[Bose Frames] knows where you are and what you’re facing using a 9-axis head motion sensor and the GPS from your iOS or Android device — and automatically adds a layer of audio through Bose AR apps, connecting that place and time to endless possibilities for travel, learning, entertainment, gaming, and more,” Bose explained.

Bose AR apps can be downloaded using Bose Connect app and are only available for iOS right now. Android apps are being developed, according to the company’s website.

The company claims that onboard battery can last up to 3.5 hours for playback and up to 12 hours on standby. It can be fully recharged in less than two hours.

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Novel device can quickly detect strokes

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Scientists have developed a device that can monitor blood flow and help quickly diagnose and treat strokes.

A stroke, one of the leading causes of death worldwide, occurs due to poor blood flow to the brain — a condition known as cerebral ischemia.

Its diagnosis must be done within the first few hours for treatment to be effective, researchers said.

 

The hybrid device, developed by researchers at the China Academy of Engineering Physics and Army Medical University in China, relies on a combination of to light measuring techniques which could diagnose cerebral ischemia non-invasively and faster than the techniques used currently.

“We can measure blood volume, blood oxygenation and blood flow using suitable near-infrared techniques,” said Liguo Zhu, from China Academy of Engineering Physics.

Zhu said that “near-infrared light penetrates one to three centimetres and allows researchers to probe under the skin.”

The working of the instrument relies on the combination of the near-infrared diffuse optical spectroscopy, which analyses the light scattered from the tissues to calculate the amount of oxygen and blood within an area, and the diffuse correlation spectroscopy, which analyses fluctuation in the tissue-scattered lights to measure blood flow.

“Both techniques share the same detectors, which decreases the number of detectors compared to other instruments,” said Zhu.

“The team’s device can record a comprehensive profile of a body part’s hemodynamics, or blood circulation. Devices should measure as many ‘hemodynamic parameters’ as necessary to obtain an accurate diagnosis, as ‘the hemodynamics of stroke is complex’,” said Hua Feng, from Army Medical University.

Another advantage of the device is that it is cheap and compact, which would make more accessible to the people, and hence, help treatment, diagnosis and chances of stroke, researchers said.

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Parineeti ‘still learning’ to play badminton

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Actress Parineeti Chopra has not started shooting for ‘Saina’ yet and says she is still learning how to play badminton.

Parineeti on Thursday said that the shooting for the biopic will commence in October.

“Hi everyone, we have not started the shoot of ‘Saina’ yet. I am still learning how to play Badminton! We will start in October once I get better at it! Four months to go,” she tweeted.

 

Parineeti had replaced actress Shraddha Kapoor in the Saina Nehwal biopic, which is being directed by Amole Gupte.

She will next be seen in ‘Jabariya Jodi’ along with actor Sidharth Malhotra. The film is scheduled for release on August 2. Directed by Prashant Singh, ‘Jabariya Jodi’ is based on ‘Pakadwa Vivah’ (forced marriage), which was once rampant in Bihar.

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