ArtsAutosBooksBusinessEducationEntertainmentFamilyFashionFoodGamesGenderHealthHolidaysHomeHubPagesPersonal FinancePetsPoliticsReligionSportsTechnologyTravel

How a Camera Works

Updated on June 14, 2009
Click thumbnail to view full-size
In this picture, the camera focused on the background.
In this picture, the camera focused on the background.
In this picture, the camera focused on the background.
Click thumbnail to view full-size
In this one, the camera focuses correctly on the cat.
In this one, the camera focuses correctly on the cat.
In this one, the camera focuses correctly on the cat.

Whether as a professional or just as a hobby, photography is a fun thing to learn. There are many different types of cameras, different styles of photography, and many subjects. I have found it helpful to learn about how the camera works and expand on what I know to produce a good picture. Here are some of the things I have learned about.

The camera looks like a complicated piece of technology. It really isn’t. It is simply a “light-proof box” with a pattern of mirrors directing small amounts of light at the right time. This is either done with one lens or two. A lens is a piece of curved glass or plastic. A single-lens reflex uses the same lens to view the picture and to take the picture and a direct vision compact camera uses two different lenses for both jobs.

The way an SLR camera works is fairly simple. When looking through the eyepiece, the light bouncing off the subject goes into your camera through the lens. Then it goes onto a mirror, bounces up, and goes into a pentaprism. A pentaprism is a piece of glass with five sides. Once in the glass, it bounces around until it reaches the eyepiece. This is the image you see. When you finally press the button on your camera, the little mirror moves out of the way and the light moves all the way to the back of the camera. There, the light either goes onto your film and creates a chemical reaction, or, if you have a digital camera, it hits an arrangement of cells. Each cell releases a very small electrical charge. This creates your final product.

A direct vision compact camera, or compact, works in a very similar way. A difference is that there is one lens for viewing and another for taking the actual picture. A compact is smaller and less weight than an SLR and that is why it is called a compact. Compacts don’t have pentaprisms or a movable mirror, so they are smaller.

Flash on a camera is another part to learn about. Flash bulbs at one time could only be used once. This was because they burned magnesium, a metal. This burned with a white light which could be made even whiter with a blue filter covering the bulb. Now, flash is made by electrical currents from batteries. The currents go through xenon gas to be a bright, white light.

The shutter is another feature to know about. The shutter is like a gate that controls the length of time the light is allowed to pass through the lens and onto the film or cells. There are two types of shutters: the leaf type and the focal-plane shutter. The leaf type is made of many thin metal blades that are opened and closed. This type works at 1/500th of a second. The focal-plane shutter is made of two rubbery fabrics that go across the focal plane, the area of the camera where the light is focused. The amount of space between the two pieces of fabric determines the shutter speed. It can go up to 1/4,000th of a second!

One other part of the camera you need to know about is focus. Your eyes focus and adjust automatically to any subject. Your camera may not. Even if it has autofocus, it may not focus on the subject you want it to. This can be seen in these two pictures: the one on the left focuses on the background, and the one on the right is focused correctly. The camera usually will focus on the center of the frame. Manual focus could be better for some as it is more accurate and lets you choose what to focus on. With autofocus, the camera sends out an infrared beam. This beam is bounced back to the camera and is measured either by the intensity of the bounce back, the distance it took to come back, or the amount of time it took to come back. Then a mini-computer in the camera finds the distance and changes the lens constantly until it finds the best, sharpest image.

I have learned a lot in using cameras. I now realize that the way the camera works is fairly simple. I also know that things like flash, the shutter, and focus are very important to know about to be able to use correctly. I plan to use this knowledge to the best. Then I can take the best possible shots whether I go on to be a professional photographer or if I’ll keep doing it just for fun!

If you have any questions, I'd be happy to answer or research a bit more and get back to you!

Comments

    0 of 8192 characters used
    Post Comment

    • Random Person profile image

      Random Person 

      8 years ago from San Diego, California

      hahaha!

    • kitkat105 profile imageAUTHOR

      kitkat105 

      9 years ago from Salem, Oregon

      WOOT! achem thank you =D this was actually a report I had to do for class! =D but I wanted to do one...so ya

      -kitkat

    • Random Person profile image

      Random Person 

      9 years ago from San Diego, California

      Wow you are a pro already!! VERY NICELY WRITTEN!!!

      Sincerly,

      Random

    working

    This website uses cookies

    As a user in the EEA, your approval is needed on a few things. To provide a better website experience, hubpages.com uses cookies (and other similar technologies) and may collect, process, and share personal data. Please choose which areas of our service you consent to our doing so.

    For more information on managing or withdrawing consents and how we handle data, visit our Privacy Policy at: https://hubpages.com/privacy-policy#gdpr

    Show Details
    Necessary
    HubPages Device IDThis is used to identify particular browsers or devices when the access the service, and is used for security reasons.
    LoginThis is necessary to sign in to the HubPages Service.
    Google RecaptchaThis is used to prevent bots and spam. (Privacy Policy)
    AkismetThis is used to detect comment spam. (Privacy Policy)
    HubPages Google AnalyticsThis is used to provide data on traffic to our website, all personally identifyable data is anonymized. (Privacy Policy)
    HubPages Traffic PixelThis is used to collect data on traffic to articles and other pages on our site. Unless you are signed in to a HubPages account, all personally identifiable information is anonymized.
    Amazon Web ServicesThis is a cloud services platform that we used to host our service. (Privacy Policy)
    CloudflareThis is a cloud CDN service that we use to efficiently deliver files required for our service to operate such as javascript, cascading style sheets, images, and videos. (Privacy Policy)
    Google Hosted LibrariesJavascript software libraries such as jQuery are loaded at endpoints on the googleapis.com or gstatic.com domains, for performance and efficiency reasons. (Privacy Policy)
    Features
    Google Custom SearchThis is feature allows you to search the site. (Privacy Policy)
    Google MapsSome articles have Google Maps embedded in them. (Privacy Policy)
    Google ChartsThis is used to display charts and graphs on articles and the author center. (Privacy Policy)
    Google AdSense Host APIThis service allows you to sign up for or associate a Google AdSense account with HubPages, so that you can earn money from ads on your articles. No data is shared unless you engage with this feature. (Privacy Policy)
    Google YouTubeSome articles have YouTube videos embedded in them. (Privacy Policy)
    VimeoSome articles have Vimeo videos embedded in them. (Privacy Policy)
    PaypalThis is used for a registered author who enrolls in the HubPages Earnings program and requests to be paid via PayPal. No data is shared with Paypal unless you engage with this feature. (Privacy Policy)
    Facebook LoginYou can use this to streamline signing up for, or signing in to your Hubpages account. No data is shared with Facebook unless you engage with this feature. (Privacy Policy)
    MavenThis supports the Maven widget and search functionality. (Privacy Policy)
    Marketing
    Google AdSenseThis is an ad network. (Privacy Policy)
    Google DoubleClickGoogle provides ad serving technology and runs an ad network. (Privacy Policy)
    Index ExchangeThis is an ad network. (Privacy Policy)
    SovrnThis is an ad network. (Privacy Policy)
    Facebook AdsThis is an ad network. (Privacy Policy)
    Amazon Unified Ad MarketplaceThis is an ad network. (Privacy Policy)
    AppNexusThis is an ad network. (Privacy Policy)
    OpenxThis is an ad network. (Privacy Policy)
    Rubicon ProjectThis is an ad network. (Privacy Policy)
    TripleLiftThis is an ad network. (Privacy Policy)
    Say MediaWe partner with Say Media to deliver ad campaigns on our sites. (Privacy Policy)
    Remarketing PixelsWe may use remarketing pixels from advertising networks such as Google AdWords, Bing Ads, and Facebook in order to advertise the HubPages Service to people that have visited our sites.
    Conversion Tracking PixelsWe may use conversion tracking pixels from advertising networks such as Google AdWords, Bing Ads, and Facebook in order to identify when an advertisement has successfully resulted in the desired action, such as signing up for the HubPages Service or publishing an article on the HubPages Service.
    Statistics
    Author Google AnalyticsThis is used to provide traffic data and reports to the authors of articles on the HubPages Service. (Privacy Policy)
    ComscoreComScore is a media measurement and analytics company providing marketing data and analytics to enterprises, media and advertising agencies, and publishers. Non-consent will result in ComScore only processing obfuscated personal data. (Privacy Policy)
    Amazon Tracking PixelSome articles display amazon products as part of the Amazon Affiliate program, this pixel provides traffic statistics for those products (Privacy Policy)