Archive for 2010

Night Photography

This series of lessons about night photography is not an absolute beginner one; an amount of photography knowledge is required for you to be able to adventure with your camera into the night. If terms like exposure, ISO, metering mode, etc. are new to you, please read my beginners tutorial first, so you can fully […]


Optical Viewfinder on a Digital Compact Camera On a digital compact camera the viewfinder represents a simple optical system that zooms at the same time as the main lens and has an optical path that runs parallel to the camera’s main lens. Being so small, viewfinders have a problem represented by framing inaccuracy. Being positioned […]

Storage Card

For digital cameras, storage card is the same thing that film is for conventional cameras. They are removable devices that hold the image taken with the camera. Storage cards are evolving in the same direction as digital cameras: larger capacities (several GB) and faster write speeds to accommodate higher resolution images and shooting in RAW […]

Sensor Sizes

If we compare a typical sensor size to a 35 mm film, we realize that the sensor size of digital SLRs is typically 40% to 100% of the surface of the 35 mm film. Although they have similar number of pixels, digital cameras have smaller sensors. As a result, the pixels are smaller and the […]

Sensors linearity

Sensors are linear devices. If you double the amount of light, the sensor output will double, as long as the pixels are not full. If a pixel reaches full capacity, the output will be constant or clipped. Human vision is non-linear. If we double the light, the effect will be larger in low light conditions […]