Have you ever hear about time-lapse photogeaphy? Here a little article about this new and exciting technique.

Onte of the challendge of time-lapse is to controling the wide variation of light du to long exposure times. These time lapses, which can be span to several hours are hard to get right. but results can be very impressive. Here's how to acheive great results using bulb ramping. It is a hoe to manual for experts and the curious alike.

Hoe to realize a bulb ramping in 4 steps:
1) Select bulb mode on your camera.
Select bulb mode allows to your intervalometer to have a direct control over your camera's settings: Aperture shutter speed and SIO. As the light changes, it will adjust the settings between shots. So exposure time can can go behound your camera's pre-programmed shutter speed, generally limited to 30 secondes

2) Configure your camera
Adjust your camera to availible light. Set your white balance in auto-mode; this make it easier to calibrate tones after light changes. Using a neutral dentity filer )see sreticl on Long Exposure) enables a large apperture, even in middle of the day, Placing this filter on your lens can give you from 1 to 10 more lens stop. To capture as exemple the transition from sunset to starry sky, the camera' settings could be:
Speed: 1/20 is the most reliable fast shutter spped in bulb mode. Aperture: The smaller apperture possible. ISO, set it at 100 as low as possible to get the best image quality and least noice. Lens: Focus in manual mode and set the focus to infinity to create as much sharpeness as possible.

3) adjust the intervalometer:
The intervalometer will first mesure availible light using intergrated light meter, and then periodic measurements and adjust the exposure based on light variations.

To capture the transition from sunset to starry sky, you camera setting should be:
Duration: 3 hours. Photo interval: 20 seconds. Intervals between two shots is derterminated by the speed of the subject, the shorther the interval, to create the impression of fludity. This work well for cloud. for instance. Light meter reading requency must be set to 10 minutes.

4) post-procution of you images
First, reduce the flickr with MSU deflickr software or LR timelapse. Then use time lapses assembler of Quick time Pro to assemble you images. When chosing the frame rate that it varia between 24 to 30 images per seconds. For instance, here is the calculation for a 30 secondes video:

Time-Lapse of 3 hours = 180 minutes = 10 800 secondes
24 images per secondes x 30 secondes of vidéo = 720 images
10 800/720 images=15 secondes interval berween each one.

Have fun and don't forget it is a errors learning, it is impossible I think to acheive good results on the first try, but it worth the effort to try!