This shot was taken using a technique known as 'open flash'. The camera has no shutter and therefore no means of triggering studio flash lights. The shot is set up and then the studio plunged into darkness. The lens cap is then removed and the flash fired by hand. The exposure is estimated using a modern digital camera rather than an exposure meter, but adjustments must be calculated for the extension of the bellows at close focus, otherwise the picture would be under-exposed. Note the wide dilation of Katie's pupils in this picture, caused by her eyes adjusting to the darkened studio before the flash was fired.