EXPOSURE The CAMERA

The Camera, a DSLR 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

 

DSLR cameras work by:

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!

7 Comments

  1. Hello there, just became alert to your blog through Google, and found that it is truly
    informative. I’m going to watch out for
    brussels. I’ll be grateful if you continue this
    in future. Numerous people will be benefited from your writing.
    Cheers!

  2. Hey There. I found your blog the use of msn. That is a really well written article.
    I will be sure to bookmark it and return to learn extra of your useful information. Thank you for
    the post. I will certainly comeback.

  3. I am really loving the theme/design of your website.
    Do you ever run into any browser compatibility
    issues? A handful of my blog readers have complained about my website not working correctly
    in Explorer but looks great in Opera. Do you have any
    solutions to help fix this issue?

  4. Pretty section of content. I just stumbled upon your weblog and in accession capital
    to say that I acquire in fact enjoyed account your weblog posts.

    Anyway I will be subscribing on your feeds or even I fulfillment you get entry to
    persistently rapidly.

Leave a Reply

Your email address will not be published. Required fields are marked *

You may use these HTML tags and attributes: <a href="" title=""> <abbr title=""> <acronym title=""> <b> <blockquote cite=""> <cite> <code> <del datetime=""> <em> <i> <q cite=""> <s> <strike> <strong>