In a Flash-part1

Magnificence  often arises out of the mundane. I was sitting in a bus staring at the traffic zipping outside. I decided to capture the traffic.......did not have anything else to do. I took out my cellphone, turned on the camera and voila to my amazement the boring traffic simply came alive. Have a look what comes out of a phone camera. 

Well that is it for now. Hope you all liked it. Cya.So the next time you are waiting somewhere and see the traffic zipping past you,you know what to do. 

Hey......Hope you enjoy my posts. So this week the monsoon was toying with us with all the clouds hovering in the sky. In the end,however,the monsoon still eluded us.

Is it just me or does the cloud below look like 'THE GRIM' from the HARRY POTTER AND THE PRISONER OF AZKABAN.

'Every cloud has a silver lining'. Don't believe me .See for yourself

Flora Part1

After a really dull day at work there is nothing like a few flowers to add color to your life

Standing out from the crowd

What caught my attention was that this was the only tree which sported both red and green as against all the other trees which sport only green. Clearly stood out from the rest 

Modes of Transportation

A few novel modes of transportation. Cars, buses are a pretty common sight. Try one of these for a change.

If you feel the above mode of transportation is not safe enough, then try this. Dad's the way to go. Nothing is safer than dad's shoulder

Basics of Camera-Part 3

Hey. So we covered lenses last time. Hope it was helpful. Today we are going to have a look at few other important parts of the camera. 

 

Perfect pictures require the perfect lighting. After all an image is nothing but light rays bouncing of an object.  But what if there are not enough light rays, meaning what if there is not enough light. In such cases the light rays have to be generated so as to get the picture. This has to be done very carefully, accurately and quickly. Enter camera flash.The basic idea of a camera flash is simply converting the electrical energy of an electron to the light energy of a photon. By the way, an electron is simply something responsible for the flow of current. And you can consider a photon as a part of light responsible for propagation of light.   

A discharge tube filled with xenon gas emitting light

The basic assembly of a camera flash is a discharge tube filled with xenon gas, metal trigger plate and a circuitry.  The battery powers the circuitry which in turn is responsible for  charging the metal plate. As electrical current moves through the metal plate electrons in the tube get attracted to the plate and move towards it. As they move towards the plate they collide with the xenon atoms in the tube and release light. This light is then directed using a mirror. Well there you have, that’s basically how a flash works, although there is a lot more to it. To actually power a flash a very high voltage is required. A regular pencil cell or even those lithium ion batteries are simply not enough. Hence an electrical device called a transformer and a capacitor is used.  Also a really neat device called an oscillator is used for creating the short burst of light. Let’s not go into the technicalities though shall we. No one is really going to ask you about it. The basics will be more than enough. 

So that was all about the camera flash. Now let us move onto another a really cool feature found on most DSLR cameras but nowadays sported by even some of those point and shoots. It is called the diopter adjustment knob. It’s a very small knob usually beside the viewfinder.  So how is a small knob like that going to be useful? Well if you have ever had a situation where the image appears all blurred from the viewfinder but the camera produces great results then this the little knob is what comes in handy. It is important to note that it does not affect the focus of the image but only the way the eye processes the image. It is basically very handy if you are wearing glasses. 

Diopter knob highlighted in red circle

Well we have almost come to the end of this article. Hope you are not getting bored. Just have one more thing to look at and that is the ‘mode dial’.

MODE DIAL: Well the mode dial is present mostly on all cameras today. However, the functionality offered by them may vary. Point and shoot cameras will offer relatively less functionality. The common modes are    

    1)      Auto: The camera automatically handles the settings, basically that of flash and exposure.

    Usually indicated by the word ‘Auto’.

   2)       Program: Same as Auto except that a few settings like the flash can be controlled

    Few others are portrait, landscape, sports, night etc.

A typical mode dial found a DSLR  camera

DSLRs and Bridge cameras give you the option to control aperture and shutter speeds in order to give you more control over the ‘exposure’. This is another topic in itself and deserves a complete article. In fact, books have actually been written about ‘exposure ‘ and the factors which influence it.

So anyways, if you really want to know what your camera has to offer it would be better to try it out. You could even read your camera manual. What??? No I am not joking. I am serious. Have a go at the manual. You never know there just might be something that you did not know about. 

Well that is it for now. So I hope the article was useful. Feel free to give me your feedback. I know a lot of people do not really want to know how a camera works but hey a little knowledge hurts no one.....right ?????I Hope. 

Thanks for your patience. 

Happy clicking.    

     

Basics of Camera-Part2 Lenses

The lens is effectively the single most important component of the camera. Without the lens there simply would be no camera. A camera lens is actually an assembly of lenses. The lenses job is to focus light on the film or the chip. Designing a lens is a daunting task. Lens designers have to overcome a number of challenges called aberration.  We will have a complete article on aberrations in the future.

For now we will just concentrate on lenses.

INSIDE OF A CAMERA LENS:

This is a very basic layout of a camera lens. Depending upon the lens there could be a lot more of those lens groups in the assembly.

FOCAL LENGTH:

The basic operation of lens is something we all learned or at least some of us learned in school. Light rays coming from an object pass through the lens and congregate on a point. The point where they meet is called the focus. The distance of this point from the optical center of the lens is called the focal length of the lens. The photographic film or the sensor is placed at the focus

FOCAL LENGTH AND ANGLE OF VIEW

A wide angle view of an object

Have you ever shot an entire city from the top of a fort or may be the top of a tower or from any other structure. Mostly likely you will only be able to capture a part of the city unless you use some kind of a panoramic view software. So even though you can see a lot more than what your photograph captured you will still see just a part of it in the photograph. This is because the lens has only that much angle of view. The angle of view is the angular extent to which a scene is captured by a camera. Say may be you manage to locate your house from up there, although that has got to be one big house, and you zoom in on it you will see more of your house and less of everything else thus reducing the angle of view even further.  


The angle of view of a lens is determined by its focal length.

 Depending on the focal length the lenses are classified as

1) Normal lenses

2) Wide Angle lenses: Which smaller focal length and have a wide angle of view

3) Telephoto lenses: Which have a greater focal length and a narrow angle of view

Always remember:

When the focal length is very large then the lens is a telephoto lens and gives a narrow angle of view. When the focal length is small then the lens is a wide angle lens and gives a wide angle of view.  

FOCAL LENGTH AND MAGNIFICATION

Now magnification is simply getting an enlarged image of something. A lot of times we want to shoot something that is really far away. To get a good shot of it you can either go towards it or bring it to you.

Many a times going near the subject would be impossible. If you enjoy wildlife photography and want to shoot a rhino......well you get the point. In such cases if the focal length is large then the image is magnified.

Focal length and magnification are also related to each other.

The greater the focal length the more the magnification.

Smaller the focal length less the magnification.

Surely, most of you will have concluded one thing from this:

The grater the magnification smaller is the angle of view which means at higher magnification you will see less of your subject.

The smaller the magnification the greater is the angle of view.

You can see here that as we focus more at center of the giant wheel we see less of the giant wheel.

So by changing the focal length of the lens you can get a wide angle view of something or a telephoto view.

WAIT A MINUTE…CHANGING FOCAL LENGTHS?

Yes.You heard it right.What's that? How can a focal length of a lens change you ask? Isn’t it supposed to stay the same? Yes and no. The focal length of any lens doesn’t change but do you remember me telling you that a camera lens is actually an assembly of lenses.  The focal length can be effectively varied by varying  the positions of the lenses in the lens assembly. Will not go into the details of this right now. But will definitely cover it in an upcoming tutorial for those interested.

TYPES OF LENSES

Most lenses today can be classified as

Zoom lenses

Macro lenses

Telephoto lenses

Prime lens

Zoom lenses are the ones which can vary their focal lengths.

Macro lenses are meant to focus on a relatively small area, used for close-ups . Example a flower or an insect

Telephoto lenses are those in which the length of the lens is smaller than the focal length.

Prime lenses are the ones with a single focal length.

Few other lenses are fish-eye lens and the tilt shift lens

A fish eye lens is ultra wide angle lens to capture a very wide image which is highly distorted.

Tilt shift lenses as the name suggest tilt and shift the lens relative to the image plane. The image plane is the film or the chip where the image is formed. The lens is shifted so that 

Canon 17-40mm Wide angle lens

Nikon AF-S NIKKOR Telephoto Lens

Pentax A prime lens

A NIKKOR fish eye lens 

Nikon tilt-shift lens