What is an exposure camera?
In photography, exposure value (EV) denotes all combinations of camera shutter speed and relative aperture that give the same exposure. The concept was developed in Germany in the 1950s (Ray 2000), in attempt to simplify choosing among combinations of equivalent camera settings. Exposure value also is used to indicate an interval on the photographic exposure scale, with 1 EV corresponding to a standard power-of-2 exposure step, commonly referred to as a “stop.”[1] Exposure value was originally indicated by the quantity symbol Ev; this symbol continues to be used in ISO standards, but the acronym EV is now more common elsewhere. Fast shutter speed, short exposure Slow shutter speed, long exposureAlthough all camera settings with the same exposure value nominally give the same exposure, they do not necessarily give the same picture. The exposure time (“shutter speed”) determines the amount of motion blur, as illustrated by the two images at the right, and the relative aperture determines
never heard the expression exposure camera?, do you mean exposure meter? Most SLRs and some compact or bridge cameras will have a bulb setting (usually only available in manual mode on the dial ‘M’) the bulb seting keeps the shutter open as long as you keep the shutter button pressed. For this kind of operation a remote release cable with lock (some advanced models have timers) tripod and mirror lock up facility are very useful. The relationship between ev and camera settings goes a bit skew-whiff at these kind of exposure lengths, you will need to trial and error. If you want maximum sharpness select an aperture around f11 or f16, if this is still too bright then select the lowest iso speed and consider also using polariser or ND filters to further restrict the light. If you are doing nightitme shots compose so the moon isn’t in the frame, it will move a lot in a minute and just come up as a smear, stars will creat a wispy arc accross the frame which can be quite pleasing. Watch out f
