reduce wait times in the eos preview loop again.
reduce wait times in the eos preview loop again.

https://github.com/gphoto/libgphoto2/issues/482

gphoto/libgphoto2,gphoto/libgphoto2,gphoto/libgphoto2,gphoto/libgphoto2,gphoto/libgphoto2,gphoto/libgphoto2