[Elphel-support] Flash on a two camera system

[Andrey Filippov]

Andreas,

that depends on what are you trying to capture. If ERS distortion is not a
problem in your case, and the LED is just to provide more light, not limit
the exposure - yes, you can do that (same as if LEDs were always ON for the
camera). If on the other hand, you need LED as a  "snapshot shutter" than
you have to reduce ambient light or increase the LED brightness and
simultaneously add neutral filters to the camera lens.

Andrey

On Wed, Apr 13, 2011 at 1:32 PM, Andreas Bean <office at beanbox.com> wrote:

> Andrey,
>
> I can't set the exposure time even near 67ms. We have difficult lighting
> conditions. For example, we have an indoor room with a bright window
> where the cam is moving.
> Setting the exposure time to 72ms will give me a blurred image of the
> window. Anything else may be sharp due to the fact that it is only
> lighted for 5ms.
> Is the only option to set the exposure time to 5ms and turn the leds on
> for 72ms?
>
> Andreas
>
> Andrey Filippov schrieb:
> > Sebastian,
> >
> > Most consumer cameras with ERS have additional mechanical shutter - it
> > opens 1/15 sec (if they used the same senor) after the sensor starts
> > exposing the first line, readout starts after the shutter closes. When
> > using the bright LED it the LED on state is virtually the same as
> > mechanical shutter open
> >
> > Andrey
> >
> >     ERS (Electronic Rolling Shutter) has been used in all consumer as
> well
> >     as professional CMOS based camera systems to date.
> >
> >
>
>
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>
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