Photo Lesson Overview on CGIPix.com

CGIPix is an observation that Nikon, Canon and the rest no longer make cameras,
they make computers that you can attach a lens to.
Here is a basic overview of what it takes to create good, better or best pictures, you decide how much effort you want to put into your pictures.

The basics of controlling Depth of Field:

Depth of Field

Depth of Field (DoF) is defined as the distance of the picture that is in focus. Controlling and creatively using DoF is one of the highlights of taking great photographs. Knowing when to use a shallow DoF, or when to use a deep DoF will make a great impact on the style and look of a photo.

Lenses and DoF
It's very easy to use lenses to create more or less DoF. The longer the lens, the less DoF, the shorter the lens, the more DoF.

A 28mm wide angle lens will have a large amount of the scene in focus, while a 600mm super-telephoto will have a very limited DoF.

This shot was taken with an 18-200mm lens, zoomed out to 18mm and set at F5.6, and entire shot is in focus.

Here's a shot taken with a 600mm lens at F5.6, you can see where the foreground and background are blurred, leaving only the deer and a little bit of area around him in focus.


Both shots above were taken at F5.6, the main difference being the lenses were 18mm and 600mm, respectively.
Aperture and DoF

The next way to control DoF is by varying the aperture. Shooting at a wide open setting, say F2.8, will give you less DoF. Shooting with the same lens at F16 instead of F2.8 will give more DoF.

DoF Preview Button

Most 35mm cameras will have a DoF preview button. By pushing the button, 2 things will happen:
1. The viewfinder will get darker (assuming your aperture is set to something other than wide open).
2. More of the frame will appear to be in focus.

35mm cameras will keep the aperture set at wide open during focusing, and then stop it down when the shutter is clicked. This allows you to see the image as brightly as possible for focusing and composition. If you are not familiar with how aperture will effect DoF, the preview button is an invaluable tool to learn about it quickly.

Hyperfocal Length

Hyperfocal length is where everything in the frame is in focus. Using a wide angle lens, and setting the aperture to F16, the amount of DoF goes from a few feet to infinity. As the lenses get longer the starting point goes further out, and the apertures need to be increased. With a 600mm lens, set at F16, the hyperfocal length is over 3,000 feet and the DoF extends from around 1,800 feet to infinity. For comparison, with a 12mm lens set at F16, the hyperfocal length is under 2 feet, and the depth of field extends from less than 1 foot to infinity.

Here are the guidelines for using any pictures from this site:

If the image is stated as being a COPYRIGHTED IMAGE, then it cannot be used. A link MUST be placed from the page that the picture is used, either to Home Page, Thumbnail Page or to the photo's Gallery Page.
The link can be a text link at the bottom of the page, or the picture can be a link.
There is a limit of 10 (Ten) photos that may be used from this website on another single website. After 10 (Ten) photos, permission must be obtained to use additional photos.
Keep the name of the picture as it was originally named, without changing it.
The images on this site are all sized at 400 x 600, that is the size limit for using them on any other website.
The Desktop Backgrounds are for personal use only, and are not meant to be put on a website, unless they are resized at 400 x 600.
You can use the images for commercial, personal, professional or any type of website.
If it's a commercial website, remember that you don't have a model release, so if it's a picture with someone in it, and they are prominently featured, you can't use it without a model release. When it's a picture of scenery or anything where the people are not identifiable, then you can use it freely.
The "MODELS" pictures are all PREMIUM images. They cannot be used without permission.
It's not a requirement, but send me an e-mail if you use a photo.