Issue:
Calculating Firefly and Firefly2 shutter (integration) settings

Solution:
The integration time for the FireFly and Firefly2 camera system is actually controlled via the camera's Exposure register (the Shutter register actually maps to backlight compensation). For more information on the different parameter settings for these two cameras, please refer to the TI chipset datasheet located in the Related Article below.

According to a technician at Texas Instruments, the following is true of the chipset:

- An API setting of 511 (Firefly) is equivalent to 33.3ms.
- An API setting of 0 is equivalent to 292us.
- The function is linear making a single tick of the exposure value equivalent to (33300-292)/512 microseconds.

The Firefly2, which uses a different image sensor, has a published range of 0 to 498. Each tick of the exposure value is the same as for the Firefly i.e. (33300-292)/512 microseconds.

Related Articles:
1.) TI Chipset used with the Firefly and Firefly2
2.) Where can I find a copy of the IIDC 1394-based Digital Camera (DCAM) Specification?
3.) Which sensor is used on my camera?
4.) Calculating Firefly and Firefly2 gain settings
5.) How do the Firefly and Firefly2 differ from other PGR Imaging Products?