Photography

What is a DSLR (Digital SLR)?

DSLR stands for “Digital Single Lens Reflex”. In simple language, DSLR is a digital camera that uses mirrors to direct light from the lens to the viewfinder, which is a hole on the back of the camera that you look through to see what you are taking a picture of.

1) What do DSLR cameras consist of?

Take a look at the following image of an SLR cross section (image courtesy of Wikipedia):

   
  1. Lens
  2. Reflex mirror
  3. Shutter
  4. Image sensor
  5. Matte focusing screen
  6. Condenser lens
  7. Pentaprism
  8. Eyepiece/Viewfinder

2) How do DSLR cameras work?

When you look through the viewfinder on the back of the camera, whatever you see is exactly what you are going to get in the photograph. The scene that you are taking a picture of passes through the lens in a form of light into a reflex mirror (#2) that sits at a 45 degree angle inside the camera chamber, which then forwards the light vertically to an optical element called a “pentaprism” (#7). The pentaprism then converts the vertical light to horizontal by redirecting the light through two separate mirrors, right into the viewfinder (#8).
When you take a picture, the reflex mirror (#2) swings upwards, blocking the vertical pathway and letting the light directly through. Then, the shutter (#3) opens up and the light reaches the image sensor (#4). The shutter (#3) remains open for as long as needed for the image sensor (#4) to record the image, then the shutter (#3) closes and the reflex mirror (#2) drops back to the 45 degree angle to continue redirecting the light into the viewfinder.
Obviously, the process doesn’t stop there. Next, a lot of complicated image processing happens on the camera. The camera processor takes the information from the image sensor, converts it into an appropriate format, then writes it into a memory card. The whole process takes very little time and some professional DSLRs can do this 11 times in one second!
The above is a very simple way to explain how DSLR cameras work.
To read a lot more about DSLRs, check out this great article at Wikipedia.


Comments

Post a Comment

Popular posts from this blog

Microsoft Toolkit 2.5.4 Windows and Office Activation

Image
Did you ever get in trouble for activation key of windows or office because that is already on the block? If the answer is yes, maybe Microsoft Toolkit can help you, if the answer is no, this article can be used as an additional information that may be useful in the days to come. So, the above problem can be solved by using one of the activation tools available in the market. Temporary  disable   your  Anti-Virus protection . ( Some of virus guard will never allow MS Toolkit to modify system registry and activate any Microsoft product !) Download Microsoft Toolkit 2.5.4 From  Here . Unzip and install. Choose the product you want to get activated and wait a few seconds. Restart your PC and enjoy a fully activated Office/Windows. Re enable your Anti-Virus protection. Why the toolkit? Microsoft toolkit is a combination of all activators. Auto KMS and EZ activator modules are built in to provide a perfect activation algorithm. Also toolkit ...
Read more

Advantages and disadvantages of USE CASE diagram

ADVANTAGES The use cases are mainly composed of narrative text. Hence, unlike many other modeling techniques, the non technical stake holders (e.g. customers, end users, salesperson etc) are also able understand the model for the software system. This means that feedback can be obtained at a very early stage of the development from the customers and the end users. Another major advantage of use case modeling is that it requires the identification of exceptional scenarios for the use cases. This helps in discovering subtle alternate requirements in the system. The use case model can be utilized in several other aspect of software development as well, e.g. Cost Estimation, Project Planning, Test Case Preparation and User Documentation. The use case diagram provides a comprehensive summary of the whole software system in a single illustration. DISADVANAGES  They do not capture the non-functional requirements easily. There might be a learning curve for the developer an...
Read more

How to Set Up a Counter Strike LAN Game

Three Methods:Counterstrike 1.6CS:GOCS:Source If you've got a big LAN party coming up, or maybe an extra computer lying around the house, try turning it into a dedicated server for painless LAN gaming. Follow this guide to get your dedicated server running, and your LAN gaming underway. Ad Method 1 of 3: Counterstrike 1.6 1 Register for a dedicated server account on Steam. You will need to run your dedicated server from a separate account, or you will not be able to connect to your own server. You do not need to add any games to this account, the game files are not necessary to run the server. Ad 2 Install Half-Life Dedicated Server. This program can be found by clicking the Library menu in Steam, and selecting Tools from the dropdown menu. Browse the list for Half-Life Dedicated Server (HLDS). The server program will require about 750MB of hard disk space. Half-Life Dedicated Server is provided free, even if there are no Half-Life purchases on the account. 3 Run t...
Read more