THE fastest imaging system ever devised has been demonstrated by the researchers reporting in the journal NATURE. THE shutter speed of the camera is half a billionth of a second, and has the ability to capture over 6 million images per second continuously. Its flash bulb is a fast laser pulse dispersed in space and then stretched in time and detected electronically. ALSO the camera works on one detector.
The approach will be instrumental in imaging fast-moving or random events, for example communication between neurons or flowing blood samples in a search for diseased cells......awesome.
Monday, July 27, 2009
Sunday, July 19, 2009
NIGHT SHOOT WITH A DIFFERENCE--2
For the second exposure of the same frame(multiple exposure), twist the focus barrel to get the light sources completely OOF...For the exposure, u cud either maintain the aperture and set the shutter speed for the remaining amount of time. i.e. one second, or u cud reduce the aperture value by one or two stops and set the shutter to less than one second. The second choice is preferable because the small aperture will minimise the effect of making the image OOF. The unfocused image becomes larger in the viewfinder, than it wud be sharply focused, creating the oversizing halo surrounding the corredtly focused subject in the picture.. This wud particularly be visible on the bright spots of the image--which is why u need to have light sources like street lamps in the frame. The halo is dependent on the out of focus factor of the second image.. The more it is out of focus, the larger the halo. To get a good effect, keep 'out of focused' image slightly underexposed than the original sharp shot.
Saturday, July 18, 2009
NIGHT SHOOT WITH A DIFFERENCE
THE ATMOSPHERE of a street at night lit by strong street lights can be made to look a lot more dramatic without using any spl filters. For instance u cud get a 'halo' effect around a street light (or any light source) can be achieved using the simple double exposure method. U wud need to shoot one correctly focused shot of the street having a few street light that are lit. And immediately after, u will need to again expose the same frame, but this time completely out of focus....Use a lowest possible ISO in ur camera, set it to the aperture priority and mount the camera on a tripod...Choose an aperture that will give u a good DOF and a long exposure time for the main image. Once u have determined the exposure time required for a given aperture, switch the camera to Manual mode and set the decided aperture...If the exposure time required was say four seconds, set the aperture to three seconds and shoot the first image......to continue
Labels:
artificial light,
DOF,
double,
exposure,
ISO,
night,
OOF,
photography,
street
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