I do use my camera quite a bit to tell me if I have a block laid out in the wrong position, but I don't use it to help me actually sew the blocks together. I make up a set of papers numbered with the block position, using numbers for the columns and letters for the rows (or vice versa) - A1, A2, A3,....B1, B2, B3... etc. I pin the appropriate label to the top left corner of each block. (That part is important - it must be to the same position on each block, and top left makes most sense to me.) Then I can stack the blocks row by row and always get them in the right order when I sew.