Ian Nichols wrote:
> On 09/01/2008, Andrew Fildes <afildes@xxxxxxxxxxxxx> wrote:
>> I'm sorry but someone is going to have to explain to me, very
>> carefully for I am a bear of very littel brane, exactly how one can
>> take a photograph before you or something actually presses the trigger.
>
> Surprisingly easily, though not with an SLR. The imaging senosor is
> kept constantly capturing images which are read into a buffer, when
> the end of the buffer is reached, it gets overwritten from the start.
> When the "shutter release" (I suppose we could call it the "keepit"
> button) is pressed, the most recently captured image is processed and
> written to the memory card.
And with this camera, you can pick through the 60 (presumably) shots
from the last second. The video at the link I posted has an example of
this where imaginary-photographer X is taking a shot of a bear catching
fish; the bear grabs a fish, slow-reactions X presses the shutter, but
because the critical fish-in-mouth moment was in the last second, X can
then check back through the preceding 60 shots to pick it.
If you missed something more than a second ago, tough luck -- and the
amount of time it'll take to go through the previous shots to pick the
good one isn't trivial either, but I guess in this exact situation it
would be useful.
-- dan
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