Monday, 22 July 2013

CAN YOUR CAMERA DETECT INFRARED RAYS ?



How to know if your camera can see infrared or not?
Its very simple! Take a remote control, it can be tv,
ac or any other control with an infrared transmitter.
Face the bulb side of the controller towards the
camera. Keep the button pressed down and click
a photograph. If you see a purple/white dot
in the photograph  near the bulb section, then it
means that your camera can detect infrared and
you can do infrared photography.

Saturday, 20 April 2013

ITS A SENSITIVE ISSUE (CCD/ CMOS SENSORS)

ITS A SENSITIVE ISSUE 

So many camera manufacturers,so many camera models and so many sensor types. Without the correct information about these sensor types one can easily end up buying a wrong camera.  So what are they and what do they do? 
Well an image sensor is a device or a unit present inside your camera's body whether it is a dslr, handy-cams (capable of clicking photographs) or compact, which converts optical image into digital or electronic signal and sends it to the processor and then to the display.Therefore an image sensor is a very important part of the camera. 
So if all sensors do the same thing, then whats the great idea to have so many different types of sensors ? 

Today we have variety of sensor types, this is because there are different levels of cameras present today. From compact cameras to professional DSLRs (compact-advance compact camera-entry level dslr-mid level dslr- semi pro dslr-professional dslr and many more ! ) These different sensor types are placed in different levels of cameras. Here are the two main type of the sensors.

CCD SENSORS 

CCD sensors or charge-coupled device. These sensors produce images with very good quality, low noise and are highly light sensitive. The CCD sensors perform well when compared side by side with cmos sensors. But these (CCD) sensors use a lot of power therefore the cameras with this type of sensor usually have lower battery life. This type of sensor has been used for many years and are more mature than cmos sensors. CCD sensors were in mass production few years back but today they have been over shadowed by cmos sensor.


CMOS SENSORS

Complementary metal-oxide-semiconductor sensor. These sensors are cheaper than CCD sensors and are much more cost effective. These sensors are used in wide range of cameras, from low to mid range and to even high end cameras. This type of sensor has a lot more transistors present around each pixel on the chip than CCD. Therefore when light hits the chip, due to majority of transistors the ray of light misses the photo diode. This leads to lower light sensitivity, high noise and bit low image quality. This type of sensors, was used earlier in products where image quality was not a priority, like webcams handycams etc. Today these have replaced CCD sensors to reduce cost as these are not made up of pure silicon ( which is very expensive ) but are coated with silicon fibers. Other reason they have replaced ccd sensors is because CMOS uses 80-90 times less power. These days CMOS sensors are being re-engineered to be used in DSLRs and other cameras and the image quality produced today by them is almost similar to CCD image sensor picture quality.

OTHER MAIN SENSOR TYPES.

Bayer sensor

Foveon X3 sensor

3CCD
 


Tuesday, 16 April 2013

DON'T JUDGE A CAMERA BY ITS RESOLUTION !

DON'T JUDGE A CAMERA BY ITS RESOLUTION !

 When people go to buy a camera (for the first time or to upgrade), they often ask for cams with more MEGA PIXELS ! They think (maybe even you, reading this) that more mega pixels means better picture quality. So they end up buying a low level camera with high pixel count and they curse the company who manufactured it. Well MORE PIXEL= MORE QUALITY ! that's not true ! AT ALL !  Picture quality is not related to pixel count. It doesn't determines if a camera is worth buying or not. Many cameras with less number of pixels do a better job than cameras with more pixels (or better resolution). 

The quality of a camera or the quality of the photos taken from it, is determined by its noise performance, ISO sensitivity, color accuracy, saturation, sharpness and  sensor type and quality. Mega Pixels only determine the print size of the photographs, it may help you if you have to blow it up to large sizes  (hoardings perhaps). In that case Hasselblad cameras with 100+ MP may help you :P. However mega pixels do come handy when you'r out to capture a very important moment and you don't have enough zoom! You can always crop the image without worrying about its quality or it will be  pixelated ( if its a good quality camera). You don't judge a book by its cover. You read it and decide its worth. Similarly Don't Judge a camera by its resolution.

Sunday, 24 March 2013

ISO

ISO

ISO ! what is it ? Well ISO basically is the photographic film sensitivity to light, or the photographic sensor sensitivity to light. (A BIT OF SCIENTIFIC THING: The study of light sensitive materials is known as   SENSITOMERTY ) Sensitomertry determines the ISO senstivity of the sensor.How to and when to change ISO settings ? These days cameras have wide iso range. Minimum iso being 100 and max 25,000 or less depending on the camera model. Higher the iso more sensitive will be the camera sensor to light. And more brighter the image. But with brightness, noise or the grain in the image will also increases. Lower the iso lower will be the noise.  EXAMPLE.


When should one increase the iso sensitivity ? 

One should increase iso only when lighting is very low or its too dark. But do not increase your iso to maximum (eg:12000 + ) or it will make your 5 mp or 8mp mobile camera look better in front of your DSLR. ISO should be set upto 800 when shooting indoors with poor light condition. If it doesn't work, then use an external flash using a diffuser or artificial lighting for better image quality.During daytime, in natural light ISO could be set to minimum (eg:100). To make photos brighter or darker and contrasty try different shutter speeds and apertures and avoid increasing iso sensitivity.

Saturday, 23 March 2013

YOUR FIRST DSLR ?

So you'r going for your first DSLR ! Are you confused what to buy at what price and why? Well you are not alone. About 75%  of people who buy their very first DSLR don't know what are their needs and what should they keep in mind before buying a DSLR. These confused, fresh so called Amateur Photographers end up buying wrong stuff. Either they buy wrong camera body or wrong lens. 

So before buying a DSLR what should you do ? When is the right time to buy a DSLR ?

Imagine a monkey with an umbrella. What will he do with it ? He will open it, chew it,jump on it ,but he will never use it as it should be ( untill he's Einstein among monkeys). He will even sit on it grabbing it hard while getting soaked in the rain. Well giving a DSLR to a person who has never used a camera in his life is equal to giving an umbrella to a monkey.

Before buying a DSLR one should explore a compact camera to its full potential. Worse type of compact camera will be great , because this will not only polish your skills but will keep you motivated while exploring the world of  DSLRs. Practice makes a man perfect. Practice on compact cameras and when you feel you are ready to upgrade and you can handle a DSLR and take good care of your equipment, then go for a DSLR.


 

WHAT IS PHOTOGRAPHY ?



Photography  is the art,science and practice of creating durable images by recording light (photons – hence, “photo”-graphy) or other electromagnetic radiation, either chemically by means of a light-sensitive material such as photographic film, or electronically by means of an image sensor.
This is what you will find on searching photography on Google..a typical Wikipedia definition.
Well I think Photography is what you want it to be. It is art if you enjoy capturing the magnificent colors of the world.
Its science if you are mesmerized by the awesome functioning of the camera, enjoy the detailed electronics  inside and how it all happens on a click of a button.
Its your inner feeling what defines photography and you’r limits. Everyone has his own
YOU DECIDE WHAT IS YOUR’S !