[gphoto-devel] Nikon D70: Download an image during the exposure

[Yoichi A. <as...@ic...>]

Dear all,

I got a problem while using the capture mode on a D70 (gphoto2
versions: gphoto2 2.3.1, libgphoto2 2.3.1, libgphoto2_port 0.7.1).

I would like to download an image while exposing the next image to
minimize the overhead. Here, I think exposure time would be about 6
second to balance the downloading time. What I am thinking about can
be expressed as follows: 

	 start  exposure of DSC_0001.NEF
	 finish exposure of DSC_0001.NEF
	 
	 start  exposure of DSC_0002.NEF
	 start  downloading DSC_0001.NEF
	 finish exposure of DSC_0002.NEF
	 finish downloading DSC_0001.NEF 
	 ...
	 start  exposure of DSC_${N}.NEF
	 start  downloading DSC_${N-1}.NEF
	 finish exposure of DSC_${N}.NEF
	 finish downloading DSC_${N-1}.NEF 

I want to take thousands of images in one night with this method.

However, the capture function for Nikon D70 (camera_nikon_capture in
libgphoto2-2.3.1/camlibs/pt2/library.c) is coded so that the program
takes an image and downloads it immediately. So, I eddited the code to
test the downloading an image during the exposure, but capturing
second image before downloading first image was not possible (the D70
hung up). 

Is there any way to make it happen?

Sincerely,
Y.Asaoka