FAQ Photography

• What is Aperture?
• What is aperture priority or A Mode?
• What is shutter priority or S Mode?
• What is the manual or M Mode?
• What is program or P Mode?
• What is Shutter Lag?
• What are different Types of lenses?
• is Effective Number of Pixels, why it differ from actual pixel?
• Whats is Burst Mode?
• what is the difference LCD on a Digital Compact Camera and TTL?

• What is Aperture?
• Aperture refers to the size of the opening in the lens that determines the amount of light Falling onto the film or sensor.

• What is aperture priority or A Mode?
• Aperture Priority In "Aperture Priority" mode, the camera allows you to select the aperture over the available range and have the camera calculate the best shutter speed to expose the image correctly. This is important if you want to control depth of field or for special effects.

• What is shutter priority or S Mode?
• In "Shutter Priority" mode, you can select the shutterspeed over the available range and have the camera calculate the best aperture to expose the image correctly. Shutter speed priority is often used to create special effects such as blurred water on a river/waterfall or to freeze action in action scenes.

• What is the manual or M Mode?
• In "Manual Priority" mode, you can select the shutterspeed and Aperture over the available range. It gives full flexibility to a photographer to take full freedom. Normally Professional for this mode.

• What is program or P Mode?
• In "Programmable Priority" mode the camera calculate the best shutter speed and aperture to expose the image correctly. This is done with the help of sensors inside the camera to measure light.

• What is Shutter Lag?
• Lag time is the time between you pressing the shutter release button and the camera when taking a snap. This delay is different from brand to barnd, and used to be the biggest drawback of digital photography. The latest digital cameras have virtually no lag times and react in the same way as conventional film cameras, even in burst mode.

• What are different Types of lenses?

• Fixed-focus, fixed-zoom lenses - These are the kinds of lenses you find on disposable and inexpensive film cameras -- inexpensive and great for snapshots, but fairly limited.
  
  Optical-zoom lenses with automatic focus - Similar to the lens on a video camcorder, you have "wide" and "telephoto" options and automatic focus. The camera may or may not let you switch to manual focus.
  
  Digital-zoom lenses - With digital zoom, the camera takes pixels from the center of the image sensor and "interpolates" them to make a full-size image. Depending on the resolution of the image and the sensor, this approach may create a grainy or fuzzy image. It turns out that you can manually do the same thing a digital zoom is doing -- simply snap a picture and then cut out the center of the image using your image processing software.
  
  Replaceable lens systems - If you are familiar with high-end 35mm cameras, then you are familiar with the concept of replaceable lenses. High-end digital cameras can use this same system, and in fact can use lenses from 35mm cameras in some cases.

• is Effective Number of Pixels, why it differ from actual pixel?
• A distinction should be made between the number of pixels in a digital image and the number of sensor pixel measurements that were used to produce that image. In conventional sensors, each pixel has one photodiode which corresponds with one pixel in the image. Sometimes not even all sensor pixels are used.. As the sensor was slightly larger, the lens was not able to cover the whole sensor.
  
  So the total number of pixels on the sensor is larger than the effective number of pixels used to create the output image. Often this higher number is preferred to specify the resolution of the camera for marketing purposes.

• Whats is Burst Mode?
• Burst or Continuous Shooting mode is the digital camera's ability to take several shots immediately one after another, similar to a film SLR camera with a motorwind. The speed (number of frames per second or fps) and total number of frames differs greatly between camera types and models. The fps is a function of the shutter release and image processing systems of the camera.

• what is the difference LCD on a Digital Compact Camera and TTL?
• The LCD on a digital compact camera shows in real time what is projected onto the sensor by the lens and therefore avoids the above parallax errors. This is also called "TTL" or "Through-The-Lens" viewing. Using the LCD for framing will shorten battery life and it may be difficult to frame accurately in very bright sunlight conditions, in which case you will have to resort to the optical or electronic viewfinder (see below).