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24 Apr 2013


ABA Creation:Check Camera Sensor for Dust and scratches

ABA Creation: How to Check Camera Sensor for Dust and scratches ~ ABA Creation
Dust and Scratches on your friend's Camera Sensor? What? That’s really very bad news. You want tocheck your camera for dust and scratches? But don’t know how to check it yourself and don’t want to spend 100 bucks on your doubt? It’s like a nightmare for any camera owner especially for D-SLR owner. No problem here is a simple DIY solution to Check

11 Apr 2013


What is ISO

Image with 2 different ISO setting
ISO in digital cameras indicates how much sensitive the sensor is, to the light. There are different values for ISO in your digital cameras i.e. ISO 100, 200, 400, 800, 1600, 3200, 6400 and more. If you choose higher value, the sensor will be more sensitive to light and produce more grains in the image and if less value chosen, the sensor will be less sensitive to the light and produce high quality image without grains. For example ISO 6400 will produce more grains than ISO 100 as shown in the given Picture.
High ISO values allow you to shoot with fast shutter speed to achieve optimal exposure with given aperture. High ISO also allows you to shoot under low light, but at the same time it also produce grainy image and reduces the quality of your image. Low ISO setting produces high quality images but limit the use of higher shutter speed. Choosing ISO value is all depends on under which circumstances you are photographing and how much you can compromise with the quality of your image. 
In the above Image, you can see clear grains  photograph at high ISO setting i,e. ISO 6400 while the another image ISO 100 have no grains and have better quality. The shutter speed for the Image ISO 100 and ISO 6400 was 1/160 and 1/25 respectively.

8 Apr 2013


Shutter Speed

Shutter speed 1/2000

Camera shutter speed is the duration of time that the shutter remains open and allow light to fall on the sensor. The longer the shutter opens the more light reach the image sensor. It also you can also use it interestingly, if shutter speed is fast, it can freeze the action and requires more light from other source like aperture, because faster shutter speed can not allow more light to reach the sensor, requires wide aperture or high ISO number to equalize the exposure. For example you want to capture some sports action like basket ball and you set the shutter speed as fast as 1/1000 sec, now make sure that you set wide aperture like f/1.4 or f/2.8 or according to whatever the light condition allow you, (we’ll discuss on how to set right exposure in our later post) but now we wont discuss on exposure so lets stick with the topic. Again if shutter speed is slow, it can smooth the moving subject like water but don’t expect to capture any action in slow shutter speed setting. If you are using manual mode, this feature can create magic, depends on how creatively you use this feature. If you want to make shutter opening and closing manually, use bulb mode.

Points to Remember:
1.     To freeze fast action (basket ball match, bike riding etc.) start with 1/800 or 1/1000 sec.
2.     For portraits and regular photos use at least 1/200 sec.
3.     Low shutter speed allows photography in bad light condition.
4.     Fast shutter speed needs larger aperture (smaller f-stops number)
5.     Slow shutter allow smaller aperture (larger f-stops number)
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6 Apr 2013


Learning Camera Aperture (f-Stops) :Explained

Aperture diagram
ABA Creation Diagram: f-stop opening
Aperture is the size of the opening on the lens mouth, allow light to enter the camera. The larger the f-stop number, smaller the aperture opening. For example- f/5.6 or f/8 means larger opening than f/11 or f/14. Please refer the diagram.

Let’s make this simpler.We can say this, it works on the same principle on which our eye does. The larger the opening the more

the light enters and vice versa. If you want to see how it works just stand in the front of the mirror with a torch in your hand, light the torch direct in your eyes, now slowly get the torch off your eyes and towards your eyes. What happens? The pupil of your eye shrinks small to control the amount of light enters into your eye, when you get torchlight directly into your eyes and when you remove torch off your eyes the pupil shrink large to allow more light to enter. The same thing happens with your camera and when you use manual mode you control this yourself.

How Aperture works?

Actually, the question is how you want it to? everything depends on the type of photograph you want to capture. If you are photographing landscapes(pic-1), you need to set larger f-stop number(smaller aperture opening) and while taking closeups you may need to set smaller f-stop number(larger aperture opening). This is called depth of field(we'll discuss this topic in our later post). If you want your subject to be in focus and everything out of focus(pic-2), then you must set smaller f-stop number(larger aperture opening), and if you want to make everything in focus then set larger f-stop number(smaller aperture opening).
Shutter 1/125,APERTURE f/11 ISO-100 
In pic-1 I need short depth of field and want everything the background and foreground in focus, so I set the aperture f/11, actually when taking a landscape photo, it good to be above f/11, though f/11 worked for me here. You can set the aperture at f/14 and above.
Wheat grain
  Shutter 1/250,APERTURE f/5.6 ISO-100
In Pic-2 you can see the foreground and background are out of focus and extra depth of field is used.You can achieve this result with smaller f-stop number (larger aperture opening). I use f/5.6 but don't hesitate to go with more smaller f-stop number(larger aperture),f/1.4 or f/2.8 can also create magic.
There is no hard and fast rule, just believe in yourself and do what suits you. All will comes with practice, the best way to learn anything.

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What is Exposure:-xplained

Camera dial
In digital cameras, exposure means the amount of light enters in the camera that reaches the camera sensor to make an image. When you turn off your Auto mode and use manual mode this is very important to know how the things work. Now the question is how light enters in the camera and how it can be controlled.

Following are the three things responsible for the exposure.

Aperture (f-stops)-Size of the opening of the lens, through which light enters in the camera
Shutter speed-Duration of the time that shutter is open
ISO-Sensor sensitivity to the Light.

You can control these features to control the amount of light enters in your camera. To control exposure (Shutter speed, Aperture, and ISO) and set the right exposure for your camera is not easy, the only thing you can do is practice, practice, and practice. We have to continuously increase and decrease the numbers until we get the right exposure. If you allow more light to enter the camera, the image can be overexposed or if allow less light to enter the image can be underexposed but you can also use this feature to show some creativity (we’ll discuss this in our later post).I found this book Basic Studio Lighting: The Photographer's Complete Guide to Professional Techniques very helpful for the lightning tutorial. In this book, you can master the lighting techniques step by step and learn the control over Shutter speed, Aperture, and ISO. Tell us how we can improve this article or what more expect from ABA Creation

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