What’s a DSLR? And how to use it?

Before getting into the usage of a DSLR, let’s see what actually DSLR is and what it does?

In a DSLR (Digital Single Lens Reflex) image you see bounces up to the viewfinder. It passes through a focusing screen and a condenser lens, and then reflects off of a prism’s walls to reach your eye. This allows you to see exactly what the lens sees through the viewfinder. Have a look at the image below.

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The main differences between a point shoot camera and a DSLR are , the DSLR will have much better photo quality and response, an ability to change lenses like telephoto lenses, wide-angles, fisheyes and many more.
Well… Now a days we even get to try these lenses as an attachment to our mobile phones too;). I have recently bought these lenses and these work amazing.

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How to use a DSLR?

I know it’s actually more dumb to write about the usage of an instrument than to read..;) So here’s the video on how to use a DSLR..

The main basic and main functions of a DSLR on which it works are ISO, SHUTTER and APERTURE.

->”Shutter” speed is responsible for motion blur. This is often seen in many pictures of moving objects where the background goes blur.

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->”ISO” is responsible for the sensitivity.

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->”Aperture” is responsible for the depth of the field.

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All these three functions are interrelated. Now let’s see all these functions on a DSLR.

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Thanks for reading… So, let me know if this was useful.

 

 

“QUARTZ WATCH” How does it work?


The Quartz watches are the most extensively used watches because of their most accurate Timekeeping.

The watch uses a tiny piece of quartz crystal which is the main ingredient of sand “silicon-dioxide” , Quartz crystals are piezoelectric, which means that they generate an electrical charge when mechanical pressure is applied to them. They also vibrate if an electrical charge is applied to them. The frequency of this vibration is a function of the cut and shape of the crystal. Quartz crystals can be cut at a consistent size and shape to vibrate at thousands of times per second(around 32,000Hz), making them extremely stable resonators for keeping very accurate time.

If you have read my previous posts, you might be knowing what exactly “Piezoelectricity” is. If you missed it here’s the link Piezoelectricity.

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This is how Quartz looks in a watch.

That quartz crystal serves as the oscillator. The battery sends electricity to the quartz crystal through an electronic circuit.  The circuit counts the vibrations and generates regular electric pulses of one per second. Now the motor comes into picture, the electric pulses when reaches the motor, the motor turns the seconds hand and the clock works,

Higher accuracy devices generally use a material with even higher frequencies (again the frequency must be as stable as possible). Atomic clocks count the oscillations between the nucleus and the electrons in an atom (typically cesium) which oscillate at around 9 billion Hz.

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How a touch screen works?

We all use a smart phone almost every single day, most of them are touch screens. Ever wonder how a touch screen of a smart device works? Before the legend and Co-founder of Apple Inc. STEVE JOBS introduced Capacitive touch to the technology world there was something called Resistive touch.

The working of resistive touch was very simple, there were two layers called Resistive layer and Conductive layer, when our finger pushes both layers at ones then the local voltage is changed and it recognises the touch and responds.

On June 29, 2007, Apple Inc. co-founder STEVE JOBS introduced a new touch technology with the first iPhone so called CAPACITIVE TOUCH. As soon as it was introduced rest of the companies started working with capacitive touch.

So, how a capacitive touch works?

Unlike resistive touch screens, capacitive screens do not use the pressure of your finger to create a change in the flow of electricity. Instead, they work with anything that holds an electrical charge – including human skin. Yes we humans do hold electric charge. Capacitive touch screens are constructed from materials like copper or indium tin oxides that store electrical charges in an electrostatic grid of tiny wires, each smaller than a human hair.

There are few layers in it, the first layer is glass, we commonly use gorilla glass. The next two layers are filled with electrodes which are very tiny. One of those contain the Driving lines which carry current and the other one contains the sensing lines which sense the amount of current. These layers are arranged such aa way that the driving lines and the sensing lines are perpendicular to each other. Now when we move our electrically conducting finger on to the screen, it changes the amount of charge. As soon as it changes, the sensing lines sense, where the charge is changed (i.e, jumped) on the driving lines. And the result is shown on the layer( LCD screen).  It also work the same way with multiple touch and the moving the finger on the screen.

This is the reason why we can only work with our touch devices with electrically conducting things like our Finger. So thanks to Steve jobs.