reduce the blobsize to 1MB , EOS R does not like 5MB
reduce the blobsize to 1MB , EOS R does not like 5MB

fixes https://github.com/gphoto/gphoto2/issues/198

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