Canon EOS 40D DSLR
| On the 28 December 2007 we purchased a new Canon EOS 40D. This is our first digital SLR and we were a little confused because this is all new to us. I started to jot down a few tip and features which i have read from numerous sites articles so that I don’t forget them. to read the full article click on”Read the rest of this article” link. this is still a work in progress.. any assistance would be appreciate. |  |
Aperture
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Shutter Speed
- shutter speed is the length of time a shutter is open
- Slow shutter speeds are often used in low light conditions, extending the time until the shutter closes, and increasing the amount of light gathered
- a shutter speed of B (for bulb) keeps the shutter open as long as the shutter release is held
- Shutter speed is measured in seconds. A typical shutter speed for photographs taken in sunlight is 1/125th of a second
ISO Speed
- how sensitive the image sensor is to the amount of light present. The higher the ISO, the more sensitive the image sensor and therefore the possibility to take pictures in low-light situations.
- auto ISO range from 100 – 800 although the 40D can be manually set to ISO 3200 (ISO expansion)
Metering Mode
- metering mode refers to the way in which a camera determines the correct exposure.
- Evaluative metering: This is an all-round metering mode suited for portraits and even backlit subjects
- Partial metering: Effective when the background is much brighter then the subject due to backlighting. Covers 9% of the viewfinder
- Spot metering: This is for metering a specific part of a subject of scene. Covers 3.8% of viewfinder
- Center-weighted average metering: the metering is weighted to the center and then averaged for the entire scene
Debth of field
the distance in front of and beyond the subject that appears to be in focus.
Notes:
- a fast shutter speed will require a larger aperture to ensure sufficient light exposure, and a slow shutter speed will require a smaller aperture to avoid excessive exposure.
Creative Zone Modes
P (program AE) mode: the camera sets the shutter speed and aperture to suite brightness. you choose to use flash and ISO levels.
Tv (Timed value AE, shutter priority) mode: you set the shutter speed, the camera automatically sets the aperture to obtain correct exposure.
Av (Aperture value AE, aperture priority) mode: you set the aperture and the camera sets the shutter speed.
M (Manual Exposure) mode: in this mode you set the shutter speed and aperture as desired.
A-DEP (automatic depth of field AE) mode: objects in the foreground and background will be in focus automatically.
My Arsenal
Canon EF-S 17-85MM f4-5.6 IS USM
Canon EF 75-300mm f/4-5.6 III USM
Some Notes on colour
- Hue: the color’s direction from white, for example in the CIE chromaticity diagram. the colour itself, Hue is that aspect of a color described with names such as “red”, “yellow”. Usually, colors with the same hue are distinguished with adjectives referring to their lightness and/or saturation, such as with “light blue”, “pastel blue”, “vivid blue”. Notable exceptions include brown, which is a dark orange, and pink, a light desaturated red
- Saturation: how “intense” or “concentrated” a color is; also known as chroma or purity. saturation or purity refers to the intensity of a specific hue. A highly saturated hue has a vivid, intense color, while a less saturated hue appears more muted and grey. With no saturation at all, the hue becomes a shade of grey
- Value: how light or dark a color is.
- Tint: a color made lighter by adding white.
- Shade: a color made darker by adding black.
Contrast
The difference between the darkest and lightest areas in a photo. The greater the difference, the higher the contrast
RGB (Red, Green, Blue) is used for computer screens, scanners, digital cameras and other devices that give out light.
RYB/CMYK (Red, Yellow, Blue and/or Cyan, Magenta, Yellow, Black) is used for paintings, magazines, fabrics, cars, and actually all materials around us that reflect light rather than emit light.